What is the test for requiring expert evidence to prove deficient work?

British Columbia, Canada


The following excerpt is from Dame v. Duke, 2021 BCCRT 922 (CanLII):

16. In general, where an allegation of deficient work is based on a claim that the work fell below the required professional standard, and the subject matter is outside ordinary knowledge, expert evidence is required to prove the deficiency. Other times, a breach of the standard may be so obvious that it does not require expert evidence (see Bergen v. Guliker, 2015 BCCA 283).

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