A joint health and safety committee is the worker-management body most Canadian jurisdictions require once a workplace crosses a worker-count threshold — and that threshold isn’t the same everywhere.
CCOHS publishes the full jurisdictional table, and the pattern across most of Canada is a 20-or-more-worker threshold — federal, Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland and Labrador and Ontario are all set at 20. Saskatchewan breaks the pattern: its committee is mandatory at just 10 workers, half the threshold used almost everywhere else in the country.
Ontario adds a size-scaled committee and a construction-specific trigger. Its own guide sets the committee mandatory for “any workplace that regularly employs 20 or more workers” [cl. 9(2)(a)] and separately for “construction projects on which 20 or more workers are regularly employed and expected to last three months or more” [cll. 9(2)(a) and 9(1)(a)]. Committee size then scales with headcount: “20 to 49” needs “at least two (2) members,” and “50 plus” needs “at least four (4) members,” with at least two of those “certified” through Basic Certification and Workplace-Specific Hazard Training, refreshed every three years. Once the committee makes a recommendation, the employer must respond in writing “within 21 calendar days” [ss. 9(20)–(21)].
An Ontario GC has a project expected to run five months with 35 workers on site at peak. That's a construction project with 20 or more workers regularly employed and expected to last three months or more, so a JHSC is mandatory. Because peak headcount clears 20 but stays under 50, the committee needs at least two members, with at least one worker-side representative certified. When the committee recommends a second site access point after reviewing a near miss, the GC has 21 calendar days to respond in writing — agreeing to it, proposing an alternative, or explaining in writing why it won't.
See also: Near miss investigation · Notice of project · Constructor vs. employer.
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