QUANTA SERVICES INC
S-8, 1999-09-01
ELECTRICAL WORK
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<PAGE>   1
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON SEPTEMBER 1, 1999
                                                    REGISTRATION NO. 333-______

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ----------------------

                                    FORM S-8
                             REGISTRATION STATEMENT
                        UNDER THE SECURITIES ACT OF 1933

                             ----------------------

                              QUANTA SERVICES, INC.
             (Exact name of registrant as specified in its charter)

          DELAWARE                                        74-2851603
(State or other jurisdiction of                 (I.R.S. employer identification)
incorporation or organization)



                         1360 POST OAK BLVD., SUITE 2100
                              HOUSTON, TEXAS 77056
          (Address, including zip code, of principal executive offices)

                             ----------------------

                              QUANTA SERVICES, INC.
                        1999 EMPLOYEE STOCK PURCHASE PLAN


                            (Full title of the Plan)
                            ------------------------


                                  BRAD EASTMAN

                         1360 POST OAK BLVD., SUITE 2100
                              HOUSTON, TEXAS 77056
                                 (713) 629-7600
 (Name, address and telephone number, including area code, of agent for service)




                         CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
                                                                      Proposed           Proposed
                Title of                         Amount               Maximum             Maximum         Amount of
               Securities                         to be            Offering Price        Aggregate       Registration
            to be Registered                   Registered            Per Share        Offering Price         Fee

<S>                                         <C>                     <C>                 <C>              <C>
Common Stock, $0.00001 par value.           1,000,000 shares          $20.875(1)       $20,875,000(1)     $5,803.25(1)

</TABLE>



(1) Pursuant to Rule 457(c), the offering price and registration fee are
computed on the basis of the average high and low prices of the Common Stock as
reported by the New York Stock Exchange on August 27, 1999.




<PAGE>   2



PART II

INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3.   INCORPORATION OF DOCUMENTS BY REFERENCE.

         The following documents have been filed by the Registrant with the
Securities and Exchange Commission, and are hereby incorporated by reference in
this Registration Statement:

         1. Quarterly Report on Form 10-Q for the quarter ended June 30, 1999;

         2. Quarterly Report on Form 10-Q for the quarter ended March 31, 1999

         3. Annual Report on Form 10-K for the fiscal year ended
            December 31, 1998;

         4. Current Report on Form 8-K filed February 26, 1999, as amended by
            Form 8-K/A filed April 23, 1999;

         5. Registration Statement on Form 8-A filed with the SEC on January 28,
            1998, which contains a description of the terms of our common stock,
            as well as any amendment or report filed later for the purpose of
            updating such description; and

         6. Current Report on Form 8-K filed June 17, 1999.

         All documents subsequently filed by the Registrant pursuant to Sections
13(a), 13(c), 14 and l5(d) of the Securities Exchange Act of 1934, prior to the
filing of a post-effective amendment to this Registration Statement that
indicates that all Common Stock to which this Registration Statement relates has
been sold or that deregisters all Common Stock to which this Registration
Statement relates then remaining unsold, shall be deemed to be incorporated by
reference in this Registration Statement and to be a part hereof from the date
of filing such reports and documents.

ITEM 4.   DESCRIPTION OF SECURITIES.

                  Not applicable.

ITEM 5.   INTERESTS OF NAMED EXPERTS AND COUNSEL.

                  Not applicable.

ITEM 6.   INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         Delaware law authorizes corporations to limit or eliminate the personal
liability of directors to corporations and their stockholders for monetary
damages for breach of a director's fiduciary duty of care. The duty of care
requires that, when acting on behalf of the corporation, directors must exercise
an informed business judgment based on all material information reasonably
available to them. Absent the limitations authorized by Delaware law, directors
are accountable to corporations and their stockholders for monetary damages for
conduct constituting gross negligence in the exercise of their duty of care.
Delaware law enables corporations to limit available relief to equitable
remedies such as injunction or rescission. Our certificate of incorporation
limits the liability of Quanta's directors to Quanta or its stockholders to the
fullest extent permitted by Delaware law. Specifically, Quanta's directors will
not be personally liable to Quanta or its



<PAGE>   3




stockholders for monetary damages for breach of a director's fiduciary duty as a
director, except for liability for breach of the duty of loyalty, for acts or
omissions not in good faith or that involve intentional misconduct or a knowing
violation of law, for unlawful payments of dividends or unlawful stock
repurchases or redemption's as provided in Section 174 of the GDCL or for any
transaction in which a director has derived an improper personal benefit.

         Our certificate of incorporation provides that each officer and
director of Quanta will be indemnified and held harmless, to the fullest extent
permitted by Delaware law (as amended from time to time), against all expenses,
liabilities and losses reasonably suffered in connection with any action, suit
or proceeding by reason of the fact that he or she was a director or officer of
Quanta or, while being at the time a director or officer of Quanta, is or was
serving at the request of Quanta as a director, trustee, officer, employee or
agent of another entity. Quanta is not, however, permitted to indemnify any
person in connection with a proceeding initiated by that person unless such
proceeding was authorized by the Board of Directors. Our bylaws also provide for
mandatory advancement of expenses of officers and directors incurred in
defending any covered proceeding in advance of its final disposition. We also
carry directors' and officers' liability insurance.

         The inclusion of these provisions in our certificate of incorporation
may have the effect of reducing the likelihood of derivative litigation against
directors and may discourage or deter stockholders or management from bringing a
lawsuit against directors for breach of their duty of care, even though such an
action, if successful, might otherwise have benefited Quanta and its
stockholders. Our bylaws provide indemnification to Quanta's officers and
directors and certain other persons with respect to certain matters.


ITEM 7.   EXEMPTION FROM REGISTRATION CLAIMED.

                  Not applicable.

ITEM 8.   EXHIBITS.

EXHIBIT
  NO            DESCRIPTION OF EXHIBIT
- -------         ----------------------

   4            Quanta Services, Inc. 1999 Employee Stock Purchase Plan*

   5            Opinion of Akin, Gump, Strauss, Hauer & Feld, L.L.P.*

  23            Consents of Independent Accountants*

  24            Power of Attorney (included on signature page of this
                Registration Statement).
- ---------------------
*        Filed herewith.

ITEM 9.   UNDERTAKINGS.   The undersigned Registrant hereby undertakes:

               (1) To file, during any period in which offers or sales are being
made, a post-effective amendment to this Registration Statement:

                      (i)  To include any  prospectus  required by
                           Section  10(a)(3) of the Securities
                           Act of 1933;


<PAGE>   4





                      (ii) To reflect in the prospectus any facts or events
arising after the effective date of this Registration Statement (or the most
recent post-effective amendment thereof) which, individually or in the
aggregate, represent a fundamental change in the information set forth in this
Registration Statement. Notwithstanding the foregoing, any increase or decrease
in volume of securities offered (if the total dollar value of securities offered
would not exceed that which was registered) and any deviation from the low or
high end of the estimated maximum offering range may be reflected in the form of
prospectus filed with the Commission pursuant to Rule 424(b) if, in the
aggregate, the changes in volume and price represent no more than a 20 percent
change in the maximum aggregate offering price set forth in the "Calculation of
Registration Fee" table in the effective Registration Statement;

                     (iii) To include any material information with respect to
the plan of distribution not previously disclosed in this Registration Statement
or any material change to such information in this Registration Statement;
provided, however, that paragraphs (l)(i) and (l)(ii) do not apply if the
information required to be included in a post-effective amendment by those
paragraphs is contained in periodic reports filed with or furnished to the
Commission by the Registrant pursuant to Section 13 or Section 15(d) of the
Securities Exchange Act of 1934 that are incorporated by reference in this
Registration Statement.

               (2) That, for the purpose of determining any liability under the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

               (3) To remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold at the
termination of the offering.

         (b) The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
Registration Statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

         (c) Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of the Registrant pursuant to the foregoing provisions, or otherwise,
the Registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.



<PAGE>   5



                                   SIGNATURES

      Pursuant to the requirements of the Securities Act of 1933, as amended,
the Registrant certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-8 and has duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of Houston, State of Texas on September 1, 1999.

                                             QUANTA SERVICES, INC.

                                    By: /s/ JOHN R. COLSON
                                        ________________________________




                                POWER OF ATTORNEY

         Each person whose signature appears below hereby constitutes and
appoints John R. Colson and James H. Haddox, and each of them, each with full
power to act without the other, his true and lawful attorneys-in-fact and
agents, each with full power of substitution and resubstitution for him and in
his name, place and stead, in any and all capacities, to sign any or all further
amendments to this Registration Statement (including post-effective amendments),
and to file the same with all exhibits thereto and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto each of
said attorneys-in-fact and agents full power and authority to do and perform
each and every act and thing requisite and necessary to be done in connection
therewith, as fully to all intents and purposes as he might or could do in
person hereby ratifying and confirming that each of said attorneys-in-fact and
agents or his substitutes may lawfully do or cause to be done by virtue hereof.

         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated below.


<TABLE>
<CAPTION>

NAME                                TITLE                                                                DATE
- ----                                -----                                                                ----

<S>                                 <C>                                                              <C>

/s/ JOHN R. COLSON                  Chief Executive Officer and                                     September 1, 1999
- -------------------------           Director (Principal Executive Officer)
John R. Colson

/s/ JAMES H. HADDOX                 Chief Financial Officer                                         September 1, 1999
- -------------------------           (Principal Financial Officer)
James H. Haddox

/s/ DERRICK A. JENSEN               Vice President and Controller                                   September 1, 1999
- -------------------------           (Principal Accounting Officer)
Derrick A. Jensen

/s/ JAMES R. BALL                   Director                                                        September 1, 1999
- -------------------------
James R. Ball

/s/ VINCENT D. FOSTER               Director                                                        September 1, 1999
- -------------------------
Vincent D. Foster

/s/ JOHN A. MARTELL                 Director                                                        September 1, 1999
- -------------------------
John A. Martell

/s/ RODNEY R. PROTO                 Director                                                        September 1, 1999
- -------------------------
Rodney R. Proto

/s/ TIMOTHY A. SOULE                Director                                                        September 1, 1999
- -------------------------
Timothy A. Soule

/s/ GARY A. TUCCI                   Director                                                        September 1, 1999
- -------------------------
Gary A. Tucci

/s/ MICHAEL T. WILLIS               Director                                                        September 1, 1999
- -------------------------
Michael T. Willis

/s/ JOHN R. WILSON                  Director                                                        September 1, 1999
- -------------------------
John R. Wilson
</TABLE>



<PAGE>   6




                                    EXHIBITS

                                INDEX TO EXHIBITS
                                -----------------
<TABLE>
<CAPTION>

EXHIBIT
  NO.             DESCRIPTION OF EXHIBIT
- -------           ----------------------
<S>               <C>
   4              Quanta Services, Inc. 1999 Employee Stock Purchase Plan*

   5              Opinion of Akin, Gump, Strauss, Hauer & Feld, L.L.P.*

  23              Consents of Independent Accountants*

  24              Power of Attorney (included on signature page of this
                  Registration Statement).
</TABLE>

- ---------------------
*        Filed herewith.




<PAGE>   1




                                                                       EXHIBIT 4


                              QUANTA SERVICES, INC.
                        1999 EMPLOYEE STOCK PURCHASE PLAN


         1. ESTABLISHMENT, PURPOSE AND TERM OF PLAN.

            1.1 ESTABLISHMENT. The Quanta Services, Inc. 1999 Employee Stock
Purchase Plan (the "Plan") is hereby established effective as of June 1, 1999
(the "Effective Date"), provided the Plan is approved by the stockholders of the
Company within twelve (12) months thereafter.

            1.2 PURPOSE. The purpose of the Plan is to align the interests of
the Company with its stockholders by providing an incentive to attract, retain
and reward Eligible Employees of the Participating Company Group and by
motivating such persons to contribute to the growth and profitability of the
Participating Company Group. The Plan provides such Eligible Employees with an
opportunity to acquire a proprietary interest in the Company through the
purchase of Stock. The Company intends that the Plan qualify as an "employee
stock purchase plan" under Section 423 of the Code (including any amendments or
replacements of such section), and the Plan shall be so construed.

            1.3 TERM OF PLAN. The Plan shall continue in effect until the
earlier of its termination by the Board or the date on which all of the shares
of Stock available for issuance under the Plan have been issued.

         2. DEFINITIONS AND CONSTRUCTION.

            2.1 DEFINITIONS. Any term not expressly defined in the Plan but
defined for purposes of Section 423 of the Code shall have the same definition
herein. Whenever used herein, the following terms shall have their respective
meanings set forth below:

                  (a) "Board" means the Board of Directors of the Company. If
one or more Committees have been appointed by the Board to administer the Plan,
"Board" also means such Committee(s).

                  (b) "Code" means the Internal Revenue Code of 1986, as
         amended, and any applicable regulations promulgated thereunder.

                  (c) "Committee" means a committee of the Board duly appointed
to administer the Plan and having such powers as shall be specified by the
Board. Unless the powers of the Committee have been specifically limited, the
Committee shall have all of the powers of the Board granted herein, including,
without limitation, the power to amend or terminate the Plan at any time,
subject to the terms of the Plan and any applicable limitations imposed by law.

                  (d) "Company" means Quanta Services, Inc., a Delaware
corporation, or any successor corporation thereto.

                  (e) "Compensation" means, with respect to any Offering Period,
base wages or salary, commissions, overtime, bonuses, annual awards, other
incentive payments and all other compensation paid in cash during such Offering
Period before deduction for any contributions to any plan maintained by a
Participating Company and described in Section 401(k) or Section 125 of the
Code. Compensation shall not include reimbursements of expenses, allowances,
long-term disability, workers'


<PAGE>   2



compensation or any amount deemed received without the actual transfer of cash
or any amounts directly or indirectly paid pursuant to the Plan or any other
stock purchase or stock option plan.

                  (f) "Eligible Employee" means an Employee who meets the
requirements set forth in Section 5 for eligibility to participate in the Plan.

                  (g) "Employee" means a person treated as an employee of a
Participating Company for purposes of Section 423 of the Code. A Participant
shall be deemed to have ceased to be an Employee either upon an actual
termination of employment or upon the corporation employing the Participant
ceasing to be a Participating Company. For purposes of the Plan, an individual
shall not be deemed to have ceased to be an Employee while such individual is on
any military leave, sick leave, or other bona fide leave of absence approved by
the Company of 90 days or less. In the event an individual's leave of absence
exceeds 90 days, the individual shall be deemed to have ceased to be an Employee
on the 91st day of such leave unless the individual's right to reemployment with
the Participating Company Group is guaranteed either by statute or by contract.
The Company shall determine in good faith and in the exercise of its discretion
whether an individual has become or has ceased to be an Employee and the
effective date of such individual's employment or termination of employment, as
the case may be. For purposes of an individual's participation in or other
rights, if any, under the Plan as of the time of the Company's determination,
all such determinations by the Company shall be final, binding and conclusive,
notwithstanding that the Company or any governmental agency subsequently makes a
contrary determination.

                  (h) "Fair Market Value" means, as of any date, the closing
price of a share of Stock on the principal national securities exchange on which
the Stock is then listed or admitted to trading, if the Stock is then listed or
admitted to trading on any national securities exchange. The closing price shall
be the last reported sale price, or, in case no such sale takes place on such
day, the average of the closing bid and asked prices, as reported by said
exchange. If the Stock is not then so listed on a national securities exchange,
the Fair Market Value shall be deemed to be the closing price of a share of
Stock (or the mean of the closing bid and asked prices if the Stock is so quoted
instead) as quoted on the Nasdaq National Market, the Nasdaq Small-Cap Market or
such other market system or regional securities exchange constituting the
primary market for the Stock, as reported in The Wall Street Journal or such
other source as the Company deems reliable. If the relevant date does not fall
on a day on which the Stock has traded on such securities exchange or market
system, the date on which the Fair Market Value shall be established shall be
the last day on which the Stock was so traded prior to the relevant date, or
such other appropriate day as shall be determined by the Board, in its sole
discretion. If there is then no public market for the Stock, the Fair Market
Value on any relevant date shall be as determined by the Board.

                  (i) "Offering" means an offering of Stock as provided in
Section 6.

                  (j) "Offering Date" means, for any Offering, the first day of
the Offering Period with respect to such Offering.

                  (k) "Offering Period" means a period established in accordance
with Section 6.1.

                  (l) "Parent Corporation" means any present or future "parent
corporation" of the Company, as defined in Section 424(e) of the Code.

                  (m) "Participant" means an Eligible Employee who has become a
participant in an Offering Period in accordance with Section 7 and remains a
participant in accordance with the Plan.


<PAGE>   3

                  (n) "Participating Company" means the Company or any Parent
Corporation or Subsidiary Corporation designated by the Board as a corporation
the Employees of which may, if Eligible Employees, participate in the Plan. The
Board shall have the sole and absolute discretion to determine from time to time
which Parent Corporations or Subsidiary Corporations shall be Participating
Companies.

                  (o) "Participating Company Group" means, at any point in time,
the Company and all other corporations collectively which are then Participating
Companies.

                  (p) "Purchase Date" means, for any Offering Period (or
Purchase Period, if so determined by the Board in accordance with Section 6.2),
the last day of such period.

                  (q) "Purchase Period" means a period, if any, established in
accordance with Section 6.2.

                  (r) "Purchase Price" means the price at which a share of Stock
may be purchased under the Plan, as determined in accordance with Section 9.

                  (s) "Purchase Right" means an option granted to a Participant
pursuant to the Plan to purchase such shares of Stock as provided in Section 8,
which the Participant may or may not exercise during the Offering Period in
which such option is outstanding. Such option arises from the right of a
Participant to withdraw any accumulated payroll deductions of the Participant
not previously applied to the purchase of Stock under the Plan and to terminate
participation in the Plan at any time during an Offering Period.

                  (t) "Stock" means the common stock of the Company, as adjusted
from time to time in accordance with Section 4.2.

                  (u) "Subscription Agreement" means a written agreement in such
form as specified by the Company, stating an Employee's election to participate
in the Plan and authorizing payroll deductions under the Plan from the
Employee's Compensation.

                  (v) "Subscription Date" means the last business day prior to
the Offering Date of an Offering Period or such earlier date as the Company
shall establish.

                  (w) "Subsidiary Corporation" means any present or future
"subsidiary corporation" of the Company, as defined in Section 424(f) of the
Code.

        2.2 CONSTRUCTION. Captions and titles contained herein are for
convenience only and shall not affect the meaning or interpretation of any
provision of the Plan. Except when otherwise indicated by the context, the
singular shall include the plural and the plural shall include the singular. Use
of the term "or" is not intended to be exclusive, unless the context clearly
requires otherwise.


<PAGE>   4

         3. ADMINISTRATION.

            3.1 ADMINISTRATION BY THE BOARD. The Plan shall be administered by
the Board. All questions of interpretation of the Plan, of any form of agreement
or other document employed by the Company in the administration of the Plan, or
of any Purchase Right shall be determined by the Board and shall be final and
binding upon all persons having an interest in the Plan or the Purchase Right.
Subject to the provisions of the Plan, the Board shall determine all of the
relevant terms and conditions of Purchase Rights granted pursuant to the Plan;
provided, however, that all Participants granted Purchase Rights pursuant to the
Plan shall have the same rights and privileges within the meaning of Section
423(b)(5) of the Code. All expenses incurred in connection with the
administration of the Plan shall be paid by the Company.

            3.2 AUTHORITY OF OFFICERS. Any officer of the Company shall have the
authority to act on behalf of the Company with respect to any matter, right,
obligation, determination or election that is the responsibility of or that is
allocated to the Company herein, provided that the officer has apparent
authority with respect to such matter, right, obligation, determination or
election.

            3.3 POLICIES AND PROCEDURES ESTABLISHED BY THE COMPANY. The Company
may, from time to time, consistent with the Plan and the requirements of Section
423 of the Code, establish, change or terminate such rules, guidelines,
policies, procedures, limitations, or adjustments as deemed advisable by the
Company, in its sole discretion, for the proper administration of the Plan,
including, without limitation, (a) a minimum payroll deduction amount required
for participation in an Offering, (b) a limitation on the frequency or number of
changes permitted in the rate of payroll deduction during an Offering, (c) an
exchange ratio applicable to amounts withheld in a currency other than United
States dollars, (d) a payroll deduction greater than or less than the amount
designated by a Participant in order to adjust for the Company's delay or
mistake in processing a Subscription Agreement or in otherwise effecting a
Participant's election under the Plan or as advisable to comply with the
requirements of Section 423 of the Code, and (e) determination of the date and
manner by which the Fair Market Value of a share of Stock is determined for
purposes of administration of the Plan.

         4. SHARES SUBJECT TO PLAN.

            4.1 MAXIMUM NUMBER OF SHARES ISSUABLE. Subject to adjustment as
provided in Section 4.2, the maximum aggregate number of shares of Stock that
may be issued under the Plan shall be 1,000,000, cumulatively increased on June
1, 2000 and each June 1 thereafter by an amount equal to the lesser of (a)
1,000,000 shares or (b) a lesser amount of shares determined by the Board, and
shall consist of authorized but unissued or reacquired shares of Stock, or any
combination thereof. If an outstanding Purchase Right for any reason expires or
is terminated or canceled, the shares of Stock allocable to the unexercised
portion of such Purchase Right shall again be available for issuance under the
Plan.

            4.2 ADJUSTMENTS FOR CHANGES IN CAPITAL STRUCTURE. In the event of
any stock dividend, stock split, reverse stock split, recapitalization,
combination, reclassification or similar change in the capital structure of the
Company, or in the event of any merger (including a merger effected for the
purpose of changing the Company's domicile), sale of assets or other
reorganization in which the Company is a party, appropriate adjustments shall be
made in the number and class of shares subject to the Plan and each Purchase
Right and in the Purchase Price. If a majority of the shares which are of the
same class as the shares that are subject to outstanding Purchase Rights are
exchanged for, converted into, or otherwise become (whether or not pursuant to
an Ownership Change Event (as defined in Section 14)) shares of another
corporation (the "New Shares"), the Board may unilaterally amend the outstanding


<PAGE>   5



Purchase Rights to provide that such Purchase Rights are exercisable for New
Shares. In the event of any such amendment, the number of shares subject to, and
the Purchase Price of, the outstanding Purchase Rights shall be adjusted in a
fair and equitable manner, as determined by the Board, in its sole discretion.
Notwithstanding the foregoing, any fractional share resulting from an adjustment
pursuant to this Section 4.2 shall be rounded down to the nearest whole number,
and in no event may the Purchase Price be decreased to an amount less than the
par value, if any, of the stock subject to the Purchase Right. The adjustments
determined by the Board pursuant to this Section 4.2 shall be final, binding and
conclusive.

         5. ELIGIBILITY.

            5.1 EMPLOYEES ELIGIBLE TO PARTICIPATE. Each Employee of a
Participating Company is eligible to participate in the Plan and shall be deemed
an Eligible Employee except the following:

                  (a) any Employee who is customarily employed by the
 Participating Company Group for 20 hours or less per week; and

                  (b) any Employee who is customarily employed by the
Participating Company Group for not more than five months in any calendar year.

            5.2 EXCLUSION OF CERTAIN STOCKHOLDERS. Notwithstanding any
provision of the Plan to the contrary, no Employee shall be granted a Purchase
Right under the Plan if, immediately after such grant, such Employee would own
or hold options to purchase stock of the Company or of any Parent Corporation or
Subsidiary Corporation possessing five percent (5%) or more of the total
combined voting power or value of all classes of stock of such corporation, as
determined in accordance with Section 423(b)(3) of the Code. For purposes of
this Section 5.2, the attribution rules of Section 424(d) of the Code shall
apply in determining the stock ownership of such Employee.

         6. OFFERINGS.

            6.1 OFFERING PERIODS. Except as otherwise set forth below, the Plan
shall be implemented by sequential Offerings of approximately six months
duration (an "Offering Period"). The first Offering Period shall commence on the
Effective Date and end on December 31, 1999. Subsequent Offerings shall commence
on the first day of January and July of each year and end on the last day of the
following June and December, respectively, occurring thereafter. Notwithstanding
the foregoing, the Board may establish a different duration for one or more
future Offering Periods or different commencing or ending dates for such
Offering Periods; provided, however, that no Offering Period may have a duration
exceeding twenty-seven (27) months. If the first or last day of an Offering
Period is not a day on which the national or regional securities exchange or
market system constituting the primary market for the Stock is open for trading,
the Company shall specify the trading day that will be deemed the first or last
day, as the case may be, of the Offering Period.

            6.2 PURCHASE PERIODS. If the Board so determines, in its discretion,
each Offering Period may consist of two or more consecutive Purchase Periods
having such duration as the Board shall specify, and the last day of each
Purchase Period shall be a Purchase Date. If the first or last day of a Purchase
Period is not a day on which the national or regional securities exchange or
market system constituting the primary market for the Stock is open for trading,
the Company shall specify the trading day that will be deemed the first or last
day, as the case may be, of the Purchase Period.

<PAGE>   6

         7. PARTICIPATION IN THE PLAN.

            7.1 INITIAL PARTICIPATION. An Eligible Employee may become a
Participant in an Offering Period by delivering a properly completed
Subscription Agreement to the office designated by the Company not later than
the close of business for such office on the Subscription Date established by
the Company for such Offering Period. An Eligible Employee who does not deliver
a properly completed Subscription Agreement to the Company's designated office
on or before the Subscription Date for an Offering Period shall not participate
in the Plan for that Offering Period or for any subsequent Offering Period
unless such Eligible Employee subsequently delivers a properly completed
Subscription Agreement to the appropriate office of the Company on or before the
Subscription Date for such subsequent Offering Period. An Employee who becomes
an Eligible Employee after the Offering Date of an Offering Period shall not be
eligible to participate in such Offering Period but may participate in any
subsequent Offering Period provided that Employee is still an Eligible Employee
as of the Offering Date of such subsequent Offering Period.

            7.2 CONTINUED PARTICIPATION. A Participant shall automatically
participate in the next Offering Period commencing immediately after the
Purchase Date of each Offering Period in which the Participant participates
provided that such Participant remains an Eligible Employee on the Offering Date
of the new Offering Period and has not either (a) withdrawn from the Plan
pursuant to Section 12.1 or (b) terminated employment as provided in Section 13.
A Participant who may automatically participate in a subsequent Offering Period,
as provided in this Section, is not required to deliver any additional
Subscription Agreement for the subsequent Offering Period in order to continue
participation in the Plan. However, a Participant may deliver a new Subscription
Agreement for a subsequent Offering Period in accordance with the procedures set
forth in Section 7.1 if the Participant desires to change any of the elections
contained in the Participant's then effective Subscription Agreement.

         8. RIGHT TO PURCHASE SHARES.

            8.1 GRANT OF PURCHASE RIGHT. Except as set forth below, on the
Offering Date of each Offering Period, each Participant in such Offering Period
shall be granted automatically a Purchase Right consisting of an option to
purchase that number of shares equal to the quotient of (i) the aggregate
payroll deductions withheld on behalf of such Participant during the Offering
Period, divided by (ii) the Purchase Price for that Offering Period. No Purchase
Right shall be granted on an Offering Date to any person who is not, on such
Offering Date, an Eligible Employee.

            8.2 CALENDAR YEAR PURCHASE LIMITATION. Notwithstanding any provision
of the Plan to the contrary, no Participant shall be granted a Purchase Right
which permits his or her right to purchase shares of Stock under the Plan to
accrue at a rate which, when aggregated with such Participant's rights to
purchase shares under all other employee stock purchase plans of a Participating
Company intended to meet the requirements of Section 423 of the Code, exceeds
$25,000 in Fair Market Value (or such other limit, if any, as may be imposed by
the Code) for each calendar year in which such Purchase Right is outstanding at
any time. For purposes of the preceding sentence, the Fair Market Value of
shares purchased during a given Offering Period shall be determined as of the
Offering Date for such Offering Period. The limitation described in this Section
8.3 shall be applied in conformance with applicable regulations under Section
423(b)(8) of the Code.



<PAGE>   7



         9. PURCHASE PRICE.

            The Purchase Price at which each share of Stock may be acquired in
an Offering Period upon the exercise of all or any portion of a Purchase Right
shall be established by the Board; provided, however, that the Purchase Right
shall not be less than eighty-five percent (85%) of the lesser of (a) the Fair
Market Value of a share of Stock on the Offering Date of the Offering Period or
(b) the Fair Market Value of a share of Stock on the Purchase Date. Unless
otherwise provided by the Board prior to the commencement of an Offering Period,
the Purchase Price for that Offering Period shall be eighty-five percent (85%)
of the lesser of (a) the Fair Market Value of a share of Stock on the Offering
Date of the Offering Period, or (b) the Fair Market Value of a share of Stock on
the Purchase Date.

        10. ACCUMULATION OF PURCHASE PRICE THROUGH PAYROLL DEDUCTION.

            Shares of Stock acquired pursuant to the exercise of all or
any portion of a Purchase Right may be paid for only by means of payroll
deductions from the Participant's Compensation accumulated during the Offering
Period for which such Purchase Right was granted, subject to the following:

            10.1 AMOUNT OF PAYROLL DEDUCTIONS. Except as otherwise provided
herein, the amount to be deducted under the Plan from a Participant's
Compensation on each payday during an Offering Period shall be determined by the
Participant's Subscription Agreement. The Subscription Agreement shall set forth
the percentage of the Participant's Compensation to be deducted on each payday
during an Offering Period in whole percentages of not less than one percent (1%)
(except as a result of an election pursuant to Section 10.3 to stop payroll
deductions made effective following the first payday during an Offering) or more
than ten percent (10%). Notwithstanding the foregoing, the BOARD may change the
limits on payroll deductions effective as of any future Offering Date.

            10.2 COMMENCEMENT OF PAYROLL DEDUCTIONS. Payroll deductions shall
commence on the first payday following the Offering Date and shall continue to
the end of the Offering Period unless sooner altered or terminated as provided
herein.

            10.3 ELECTION TO CHANGE OR STOP PAYROLL DEDUCTIONS. During an
Offering Period, a Participant may elect to increase or decrease the rate of or
to stop deductions from his or her Compensation by delivering to the Company's
designated office an amended Subscription Agreement authorizing such change on
or before the "Change Notice Date." The "Change Notice Date" shall be a date
prior to the beginning of the first pay period for which such election is to be
effective as established by the Company from time to time and announced to the
Participants. Unless otherwise established by the Company, the Change Notice
Date shall be the seventh day prior to the end of the first pay period for which
such election is to be effective. A Participant who elects to decrease the rate
of his or her payroll deductions to zero percent (0%) shall nevertheless remain
a Participant in the current Offering Period unless such Participant withdraws
from the Plan as provided in Section 12.1.

            10.4 ADMINISTRATIVE SUSPENSION OF PAYROLL DEDUCTIONS. The Company
may, in its sole discretion, suspend a Participant's payroll deductions under
the Plan as the Company deems advisable to avoid accumulating payroll deductions
in excess of the amount that could reasonably be anticipated to purchase the
maximum number of shares of Stock permitted during a calendar year under the
limit set forth in Section 8.3. Payroll deductions shall be resumed at the rate
specified in the Participant's then effective Subscription Agreement at the
beginning of the next Offering Period the Purchase Date of which falls in the
following calendar year.


<PAGE>   8


            10.5 PARTICIPANT ACCOUNTS. Individual bookkeeping accounts shall be
maintained for each Participant. All payroll deductions from a Participant's
Compensation shall be credited to such Participant's Plan account and shall be
deposited with the general funds of the Company. All payroll deductions received
or held by the Company may be used by the Company for any corporate purpose.

            10.6 NO INTEREST PAID. Interest shall not be paid on sums deducted
from a Participant's Compensation pursuant to the Plan.

            10.7 VOLUNTARY WITHDRAWAL FROM PLAN ACCOUNT. A Participant may
withdraw all or any portion of the payroll deductions credited to his or her
Plan account and not previously applied toward the purchase of Stock by
delivering to the Company's designated office a written notice on a form
provided by the Company for such purpose. A Participant who withdraws the entire
remaining balance credited to his or her Plan account shall be deemed to have
withdrawn from the Plan in accordance with Section 12.1. Amounts withdrawn shall
be returned to the Participant as soon as practicable after the withdrawal and
Company may from time to time establish or change limitations on the frequency
of withdrawals permitted under this Section, establish a minimum dollar amount
that must be retained in the Participant's Plan account, or terminate the
withdrawal right provided by this Section.

        11. PURCHASE OF SHARES.

            11.1 EXERCISE OF PURCHASE RIGHT. On each Purchase Date of an
Offering Period, each Participant who has not withdrawn from the Plan and whose
participation in the Offering has not terminated before such Purchase Date shall
automatically acquire pursuant to the exercise of the Participant's Purchase
Right the number of whole shares of Stock determined by dividing (a) the total
amount of the Participant's payroll deductions accumulated in the Participant's
Plan account during the Offering Period and not previously applied toward the
purchase of Stock by (b) the Purchase Price. However, in no event shall the
number of shares purchased by the Participant during an Offering Period exceed
the number of shares subject to the Participant's Purchase Right. No shares of
Stock shall be purchased on a Purchase Date on behalf of a Participant whose
participation in the Offering or the Plan has terminated before the Purchase
Date.

            11.2 PRO RATA ALLOCATION OF SHARES. In the event that the number of
shares of Stock which might be purchased by all Participants in the Plan on a
Purchase Date exceeds the number of shares of Stock available in the Plan as
provided in Section 4.1, the Company shall make a pro rata allocation of the
remaining shares in as uniform a manner as shall be practicable and as the
Company shall determine to be equitable. Any fractional share resulting from
such pro rata allocation to any Participant shall be disregarded.

            11.3 DELIVERY OF CERTIFICATES. As soon as practicable after each
Purchase Date, the Company shall arrange the delivery to each Participant, as
appropriate, of a certificate representing the shares acquired by the
Participant on such Purchase Date; provided that the Company may deliver such
shares to a broker that holds such shares in street name for the benefit of the
Participant. Shares to be delivered to a Participant under the Plan shall be
registered in the name of the Participant, or, if requested by the Participant,
in the name of the Participant and his or her spouse, or, if applicable in, the
names of the heirs of the Participant.

            11.4 RETURN OF CASH BALANCE. Any cash balance remaining in a
Participant's Plan account following any Purchase Date shall be refunded to the
Participant as soon as practicable after such Purchase Date. However, if the
cash to be returned to a Participant pursuant to the preceding sentence is an
amount less than the amount that would have been necessary to purchase an
additional whole share of Stock on such Purchase Date, the Company may retain
such amount in the Participant's


<PAGE>   9


Plan account to be applied toward the purchase of shares of Stock in the
subsequent Purchase Period or Offering Period, as the case may be.

            11.5 TAX WITHHOLDING. At the time a Participant's Purchase Right is
exercised, in whole or in part, or at the time a Participant disposes of some or
all of the shares of Stock he or she acquires under the Plan, the Participant
shall make adequate provisions for the foreign, federal, state and local tax
withholding obligations of the Participating Company Group, if any, which arise
upon exercise of the Purchase Right or upon such disposition of shares,
respectively. The Participating Company Group may, but shall not be obligated
to, withhold from the Participant's compensation the amount necessary to meet
such withholding obligations.

            11.6 EXPIRATION OF PURCHASE RIGHT. Any portion of a Participant's
Purchase Right remaining unexercised after the end of the Offering Period to
which the Purchase Right relates shall expire immediately upon the end of the
Offering Period.

            11.7 REPORTS TO PARTICIPANTS. Each Participant who has exercised
all or part of his or her Purchase Right shall receive, as soon as practicable
after the Purchase Date, a report of such Participant's Plan account setting
forth the total payroll deductions accumulated prior to such exercise, the
number of shares of Stock purchased, the Purchase Price for such shares, the
date of purchase and the cash balance, if any, remaining immediately after such
purchase that is to be refunded or retained in the Participant's Plan account
pursuant to Section 11.4. The report required by this Section may be delivered
in such form and by such means, including by electronic transmission, as the
Company may determine.

        12. WITHDRAWAL FROM THE PLAN.

            12.1 VOLUNTARY WITHDRAWAL FROM THE PLAN. A Participant may withdraw
from the Plan by signing and delivering to the Company's designated office a
written notice of withdrawal on a form provided by the Company for such purpose.
Such withdrawal may be elected at any time prior to the end of an Offering
Period. A Participant who voluntarily withdraws from the Plan is prohibited from
resuming participation in the Plan in the same Offering from which he or she
withdrew, but may participate in any subsequent Offering by again satisfying the
requirements of Sections 5 and 7.1. The Company may impose, from time to time, a
requirement that the notice of withdrawal from the Plan be on file with the
Company's designated office for a reasonable period prior to the effectiveness
of the Participant's withdrawal.

            12.2 RETURN OF PAYROLL DEDUCTIONS. Upon a Participant's voluntary
withdrawal from the Plan pursuant to Section 12.1, the Participant's accumulated
payroll deductions which have not been applied toward the purchase of shares of
Stock shall be refunded to the Participant as soon as practicable after the
withdrawal, without the payment of any interest, and the Participant's interest
in the Plan shall terminate. Such accumulated payroll deductions to be refunded
in accordance with this Section may not be applied to any other Offering under
the Plan.

        13. TERMINATION OF EMPLOYMENT OR ELIGIBILITY.

            Upon a Participant's ceasing, prior to a Purchase Date, to be
an Employee of the Participating Company Group for any reason, including
retirement, disability or death, or the failure of a Participant to remain an
Eligible Employee, the Participant's participation in the Plan shall terminate
immediately. In such event, the payroll deductions credited to the Participant's
Plan account since the last Purchase Date shall, as soon as practicable, be
returned to the Participant or, in the case of the Participant's death, to the
Participant's legal representative, and all of the Participant's rights under
the Plan shall terminate. Interest shall not be paid on sums returned pursuant
to this Section 13. A


<PAGE>   10


Participant whose participation has been so terminated may again become eligible
to participate in the Plan by again satisfying the requirements of Sections 5
and 7.1.

         14. CHANGE IN CONTROL.

             14.1 DEFINITIONS.

                  (a) An "Ownership Change Event" shall be deemed to have
occurred if any of the following occurs with respect to the Company: (i) the
direct or indirect sale or exchange in a single or series of related
transactions by the stockholders of the Company of more than fifty percent (50%)
of the voting stock of the Company; (ii) a merger or consolidation in which the
Company is a party; (iii) the sale, exchange, or transfer of all or
substantially all of the assets of the Company; or (iv) a liquidation or
dissolution of the Company.

                  (b) A "Change in Control" shall mean an Ownership Change Event
or a series of related Ownership Change Events (collectively, the "Transaction")
wherein the stockholders of the Company immediately before the Transaction do
not retain immediately after the Transaction, in substantially the same
proportions as their ownership of shares of the Company's voting stock
immediately before the Transaction, direct or indirect beneficial ownership of
more than fifty percent (50%) of the total combined voting power of the
outstanding voting stock of the Company or the corporation or corporations to
which the assets of the Company were transferred (the "Transferee
Corporation(s)"), as the case may be. For purposes of the preceding sentence,
indirect beneficial ownership shall include, without limitation, an interest
resulting from ownership of the voting stock of one or more corporations which,
as a result of the Transaction, own the Company or the Transferee
Corporation(s), as the case may be, either directly or through one or more
subsidiary corporations. The Board shall have the right to determine whether
multiple sales or exchanges of the voting stock of the Company or multiple
Ownership Change Events are related, and its determination shall be final,
binding and conclusive.

            14.2 EFFECT OF CHANGE IN CONTROL ON PURCHASE RIGHTS. In the event
of a Change in Control, the surviving, continuing, successor, or purchasing
corporation or parent corporation thereof, as the case may be (the "Acquiring
Corporation"), may assume the Company's rights and obligations under the Plan.
If the Acquiring Corporation elects not to assume the Company's rights and
obligations under outstanding Purchase Rights, the Purchase Date of the then
current Offering Period (or Purchase Price) shall be accelerated to a date
before the date of the Change in Control specified by the Board, but the number
of shares of Stock subject to outstanding Purchase Rights shall not be adjusted.
All Purchase Rights which are neither assumed by the Acquiring Corporation in
connection with the Change in Control nor exercised as of the date of the Change
in Control shall terminate and cease to be outstanding effective as of the date
of the Change in Control.

        15. NONTRANSFERABILITY OF PURCHASE RIGHTS.

            A Purchase Right may not be transferred in any manner
otherwise than by will or the laws of descent and distribution and shall be
exercisable during the lifetime of the Participant only by the Participant.


<PAGE>   11


        16. COMPLIANCE WITH SECURITIES LAW.

            The issuance of shares under the Plan shall be subject to
compliance with all applicable requirements of federal, state and foreign law
with respect to such securities. A Purchase Right may not be exercised if the
issuance of shares upon such exercise would constitute a violation of any
applicable federal, state or foreign securities laws or other law or regulations
or the requirements of any securities exchange or market system upon which the
Stock may then be listed. In addition, no Purchase Right may be exercised unless
(a) a registration statement under the Securities Act of 1933, as amended, shall
at the time of exercise of the Purchase Right be in effect with respect to the
shares issuable upon exercise of the Purchase Right, or (b) in the opinion of
legal counsel to the Company, the shares issuable upon exercise of the Purchase
Right may be issued in accordance with the terms of an applicable exemption from
the registration requirements of said Act. The inability of the Company to
obtain from any regulatory body having jurisdiction the authority, if any,
deemed by the Company's legal counsel to be necessary to the lawful issuance and
sale of any shares under the Plan shall relieve the Company of any liability in
respect of the failure to issue or sell such shares as to which such requisite
authority shall not have been obtained. As a condition to the exercise of a
Purchase Right, the Company may require the Participant to satisfy any
qualifications that may be necessary or appropriate, to evidence compliance with
any applicable law or regulation, and to make any representation or warranty
with respect thereto as may be requested by the Company.

        17. RIGHTS AS A STOCKHOLDER AND EMPLOYEE.

            A Participant shall have no rights as a stockholder by virtue
of the Participant's participation in the Plan until the date of the issuance of
a certificate for the shares purchased pursuant to the exercise of the
Participant's Purchase Right (as evidenced by the appropriate entry on the books
of the Company or of a duly authorized transfer agent of the Company). No
adjustment shall be made for dividends, distributions or other rights for which
the record date is prior to the date such certificate is issued, except as
provided in Section 4.2. Nothing herein shall confer upon a Participant any
right to continue in the employ of the Participating Company Group or interfere
in any way with any right of the Participating Company Group to terminate the
Participant's employment at any time.

        18. LEGENDS.

            The Company may at any time place legends or other identifying
symbols referencing any applicable federal, state or foreign securities law
restrictions or any provision convenient in the administration of the Plan on
some or all of the certificates representing shares of Stock issued under the
Plan. The Participant shall, at the request of the Company, promptly present to
the Company any and all certificates representing shares acquired pursuant to a
Purchase Right in the possession of the Participant in order to carry out the
provisions of this Section.

        19. NOTIFICATION OF SALE OF SHARES.

            The Company may require the Participant to give the Company
prompt notice of any disposition of shares acquired by exercise of a Purchase
Right within two years from the date of granting such Purchase Right or one year
from the date of exercise of such Purchase Right. The Company may require that
until such time as a Participant disposes of shares acquired upon exercise of a
Purchase Right, the Participant shall hold all such shares in the Participant's
name (or, if elected by the Participant, in the name of the Participant and his
or her spouse but not in the name of any nominee) until the lapse of the time
periods with respect to such Purchase Right referred to in the preceding
sentence. The Company may direct that the certificates evidencing shares
acquired by exercise of a Purchase Right refer to such requirement to give
prompt notice of disposition.


<PAGE>   12

        20. NOTICES.

            All notices or other communications by a Participant to the
Company under or in connection with the Plan shall be deemed to have been duly
given when received in the form specified by the Company at the location, or by
the person, designated by the Company for the receipt thereof.

        21. INDEMNIFICATION.

            In addition to such other rights of indemnification as they
may have as members of the Board or officers or employees of the Participating
Company Group, members of the Board and any officers or employees of the
Participating Company Group to whom authority to act for the Board or the
Company is delegated shall be indemnified by the Company against all reasonable
expenses, including attorneys' fees, actually and necessarily incurred in
connection with the defense of any action, suit or proceeding, or in connection
with any appeal therein, to which they or any of them may be a party by reason
of any action taken or failure to act under or in connection with the Plan, or
any right granted hereunder, and against all amounts paid by them in settlement
thereof (provided such settlement is approved by independent legal counsel
selected by the Company) or paid by them in satisfaction of a judgment in any
such action, suit or proceeding, except in relation to matters as to which it
shall be adjudged in such action, suit or proceeding that such person is liable
for gross negligence, bad faith or intentional misconduct in duties; provided,
however, that within sixty (60) days after the institution of such action, suit
or proceeding, such person shall offer to the Company, in writing, the
opportunity at its own expense to handle and defend the same.

        22. AMENDMENT OR TERMINATION OF THE PLAN.

            The Board may at any time amend or terminate the Plan, except
that (a) such termination shall not affect Purchase Rights previously granted
under the Plan, except as permitted under the Plan, and (b) no amendment may
adversely affect a Purchase Right previously granted under the Plan (except to
the extent permitted by the Plan or as may be necessary to qualify the Plan as
an employee stock purchase plan pursuant to Section 423 of the Code or to obtain
qualification or registration of the shares of Stock under applicable federal,
state for foreign securities laws). In addition, an amendment to the Plan must
be approved by the stockholders of the Company within 12 months of the adoption
of such amendment if such amendment would authorize the sale of more shares than
are authorized for issuance under the Plan or would change the definition of the
corporations that may be designated by the Board as Participating Companies. In
the event that the Board approves an amendment to increase the number of shares
authorized for issuance under the Plan (the "Additional Shares"), the Board, in
its sole discretion, may specify that such Additional Shares may only be issued
pursuant to Purchase Rights granted after the date on which the stockholders of
the Company approve such amendment, and such designation by the Board shall not
be deemed to have adversely affected any Purchase Right granted prior to the
date on which the stockholders approve the amendment.


<PAGE>   1
                                                                       EXHIBIT 5
                    AKIN, GUMP, STRAUSS, HAUER & FELD, L.L.P.

                               September 1, 1999

Quanta Services, Inc.
1360 Post Oak Blvd., Suite 2100
Houston, Texas   77056

Ladies and Gentlemen:

         We have acted as counsel for Quanta Services, Inc., a Delaware
corporation (the "COMPANY"), in connection with the Company's registration under
the Securities Act of 1933, as amended (the "ACT"), of 1,000,000 shares of
common stock, par value $0.00001 per share (the "SHARES"), of the Company which
may be offered from time to time under the Quanta Services, Inc. 1999 Employee
Stock Purchase Plan (the "PLAN") under the Company's Registration Statement on
Form S-8 (the "REGISTRATION STATEMENT") to be filed with the Securities and
Exchange Commission (the "COMMISSION") on or about September 1, 1999.

         In reaching the opinions set forth herein, we have examined and are
familiar with originals or copies, certified or otherwise identified to our
satisfaction, of such documents and records of the Company and such statutes,
regulations and other instruments as we deemed necessary or advisable for
purposes of this opinion, including (i) the Registration Statement, (ii) the
Amended and Restated Certificate of Incorporation of the Company, as filed with
the Secretary of State of the State of Delaware, (iii) the Bylaws of the
Company, (iv) certain minutes of meetings of, and resolutions adopted by, the
Board of Directors of the Company, and (v) the Plan.

         We have assumed that (i) all signatures on all documents we reviewed
are genuine, (ii) all documents submitted to us as originals are true and
complete, (iii) all documents submitted to us as copies are true and complete
copies of the originals thereof, and (iv) all persons executing and delivering
the documents we examined were competent to execute and deliver such documents.
In addition, we have assumed that, upon purchase of the Shares pursuant to the
Plan, (i) the Shares will be issued in accordance with the Plan, (ii) the full
consideration for each Share shall be paid to the Company and in no event will
be less than the par value for each Share, and (iii) certificates evidencing the
Shares will be properly executed and delivered by the Company in accordance with
the Delaware General Corporation Law.

         Based on the foregoing, and having due regard for the legal
considerations we deem relevant, we are of the opinion that the Shares, when
issued by the Company upon purchase thereof pursuant to the terms of the Plan,
will be legally issued, fully paid and non-assessable.

         This opinion is limited in all respects to the laws of the State of
Texas, the Delaware General Corporation Law and the federal laws of the United
States of America.

         This opinion letter may be filed as an exhibit to the Registration
Statement. In giving this consent, we do not thereby admit that we come within
the category of persons whose consent is required under Section 7 of the Act or
the rules and regulations of the Commission promulgated thereunder.

                                Very truly yours,


                                /s/Akin, Gump, Strauss, Hauer & Feld L.L.P.
                                -----------------------------------------


<PAGE>   1
                                                                      EXHIBIT 23

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

         As independent public accountants, we hereby consent to the
incorporation by reference of the following reports on the financial statements
of the following businesses in this Registration Statement on Form S-8 of Quanta
Services, Inc.; our report dated June 7, 1999, on the consolidated financial
statements of Quanta Services, Inc. and Subsidiaries as of and for the three
years in the period ended December 31, 1998; our report dated May 7, 1999, on
the combined financial statements of Driftwood Electrical Contractors, Inc. as
of and for the year ended December 31, 1998; and our report dated June 3, 1999
on the combined financial statements of the H.L. Chapman Construction Group as
of and for the year ended October 31, 1998, all three of which were included in
the Quanta Services, Inc. Current Report on Form 8-K filed on June 17, 1999; our
report dated March 19, 1999 on the combined financial statements of Northern
Line Layers, Inc. as of and for the year ended December 31, 1998, as included in
the Quanta Services, Inc. Current Report on Form 8-K/A filed on April 23, 1999,
and to the incorporation by reference of said reports into Quanta Services,
Inc.'s previously filed Registration Statements on Form S-8 (File Nos.
333-47069, 333-56849) and Form S-3 (File Nos. 333-81419).

ARTHUR ANDERSEN LLP

Houston, Texas
August 27, 1999
<PAGE>   2



                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



         As independent public accountants, we hereby consent to the
incorporation by reference in this Registration Statement on Form S-8 of Quanta
Services, Inc. with respect to the consolidated financial statements and
financial schedule of Seaward Corporation included or incorporated by reference
in its current report (Form 8-K) filed June 17, 1999 and Form S-3 (#333-81419)
filed June 23, 1999, as well as to all references to our firm included in this
Registration Statement.

/s/ NATHAN WECHSLER & COMPANY

NATHAN WECHSLER & COMPANY
Concord, New Hampshire
August 30, 1999
<PAGE>   3
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



As independent public accountants, we hereby consent to the incorporation by
reference in this Registration Statement on Form S-8 of Quanta Services, Inc.
with respect to the consolidated financial statements and financial schedule of
Dillard Smith Construction Company included or incorporated by reference in its
current report (Form 8-K) filed June 17, 1999 and Form S-3 (#333-81419) filed
June 23, 1999, as well as to all references to our firm included in this
Registration Statement.

                                       /s/ JOSEPH DECOSIMO AND COMPANY, LLP

                                       JOSEPH DECOSIMO AND COMPANY, LLP

Chattanooga, Tennessee
August 30, 1999
<PAGE>   4


                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

As independent public accountants, we hereby consent to the incorporation by
reference in this Registration Statement on Form S-8 of Quanta Services, Inc.
with respect to the financial statements of Tom Allen Construction Company
included or incorporated by reference in the Quanta Services, Inc. Current
Report on Form 8-K filed on June 17, 1999 and its Form S-3 (File No. 333-81419)
filed on June 23, 1999, as well as to all references to our Firm included in
this Registration Statement.


/s/ GANIM, MEDER, CHILDERS & HOERING, P.C.
GANIM, MEDER, CHILDERS & HOERING, P.C.

Belleville, Illinois
August 31, 1999
<PAGE>   5



                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent public accountants, we hereby consent to the incorporation by
reference in this Registration Statement on Form S-8 of Quanta Services, Inc.
with respect to the consolidated financial statements and financial schedule
of The Ryan Co., Inc. included or incorporated by reference in its current
report (Form 8-K) filed June 17, 1999 and Form S-3 (#333-81419) filed June 23,
1999, as well as to all references to our firm included in this Registration
Statement.


/s/ KIRKLAND ALBRECHT AND COMPANY, P.C.

Kirkland Albrecht and Company, P.C.
August 27, 1999


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