- 36 -
of 4” thick Tyndall stone, and dropped nine storeys. Had this
cladding landed on a person or on other property, it would
unquestionably have caused serious injury or damage. [Emphasis
added; para. 38.]
Given the “reasonable likelihood that a defect in a building will cause
injury to its inhabitants ... if it poses a real and substantial danger”, the
Court held that a builder owed a duty to take reasonable care in the
design or construction of building structures to avoid creating a real
and substantial danger to health and safety (para. 36).
[109]
Following this observation, the majority in Maple Leaf went on to address
the nature of the plaintiff’s endangered right that will inform the existence of a duty of
care – a right measured in proportion to the threat of harm. Aside from the real and
substantial character of the threat, the measure also includes an “imminent” threat. In
this regard, the majority wrote the following at paras. 44-46:
44
At first glance, the liability rule in Winnipeg Condominium
Corp. No. 36 may appear curious, since it appears as though liability
is imposed not in respect of damage that has occurred to the plaintiff’s
rights, but in respect of a real and substantial danger thereto. As a
general principle, there is no liability for negligence “in the air”, for
“[t]here is no right to be free from the prospect of damage” but “only
a right not to suffer damage that results from exposure to unreasonable
risk” (Atlantic Lottery Corp. Inc. v. Babstock, 2020 SCC 19, at para.
33 (emphasis in original); Clements (Litigation Guardian of) v.
Clements, 2012 SCC 32, [2012] 2 S.C.R. 181, at para. 16; Ratych v.
Bloomer, [1990] 1 S.C.R. 940, at p. 964).
45
We maintain, however, that, properly understood, the liability
rule in Winnipeg Condominium Corp. No. 36 is consonant with that
principle. In that case, the Court was clear about the source of the right
to which the duty of care corresponds: the plaintiff’s rights in person
or property (paras. 21, 36 and 42). Where a design or construction
defect poses a real and substantial danger — that is, what Fraser C.J.A.
and Côté J.A. described in Blacklaws v. 470433 Alberta Ltd., 2000
ABCA 175 (Alta. C.A.), at para. 62, as “imminent risk” of “physical
harm to the plaintiffs or their chattels” or property — and the danger
“would unquestionably have caused serious injury or damage” if
realized, given the “reasonable likelihood that a defect ... will cause
injury to its inhabitants”, it makes little difference whether the plaintiff
recovers for an injury actually suffered or for expenditures incurred in
preventing the injury from occurring (Winnipeg Condominium Corp.
No. 36, at paras. 36 and 38; see also Morrison Steamship Co. v.