Every worker in Canada has the legal right to refuse work they genuinely believe is dangerous to themselves or another worker, and it is illegal for an employer to fire, discipline or otherwise punish them for using it. This is one of the three core worker rights built into the Internal Responsibility System (see OHS Basics and the Internal Responsibility System), alongside the right to know and the right to participate. The refusal is not a walkout or a tool to win an argument; it is a structured legal process with defined stages, and used properly it protects both the worker and the contractor. One province, Alberta, applies a narrower test than the rest, which is covered below.
The two-stage process
Most provinces follow the pattern set out clearly in Ontario's OHSA section 43. It runs in two stages.
Stage one, the internal investigation:
- The worker tells the supervisor or employer that the work is being refused, and explains why.
- The worker stays in a safe place near their workstation while it is sorted out. They do not just leave site, and they are not sent home unpaid for raising it.
- The supervisor or employer investigates immediately, in the presence of the worker and a worker member of the Joint Health and Safety Committee (or a worker the union or workers select).
- If the problem is resolved and the worker is satisfied, they return to work.
Stage two, the regulator steps in:
- If the worker still has reasonable grounds to believe the work endangers them, the matter goes to the provincial OHS regulator.
- An inspector attends, investigates in the presence of all parties, and makes a binding decision on whether the work is dangerous and what must be done.
The structure matters: a refusal is meant to be raised, investigated on the spot, and escalated only if it is not resolved. It is not a strike, and it is not silent.
You cannot be punished for refusing
Anti-reprisal protection is the backbone of the right. In Ontario it sits in OHSA section 50, and every province has an equivalent: an employer may not dismiss, discipline, threaten, or in any way penalise a worker for exercising the refusal right in good faith. If an employer retaliates, that is itself an offence, separate from the safety issue that triggered the refusal. A worker who is punished can complain to the regulator or the labour board. For a contractor, the lesson is simple: never react to a refusal with discipline; investigate it.
Alberta applies a narrower test
There is one significant difference to know. Alberta narrowed its refusal right under Bill 47 in 2020. A worker in Alberta may refuse only where the work poses an "undue hazard", defined as a hazard that creates a serious and immediate threat. That is a tighter test than in other provinces, and it specifically excludes slow, chronic or cumulative risks, for example long-term dust exposure would not, on its own, meet the "serious and immediate" bar for a refusal in Alberta. Workers and contractors in Alberta should understand that the threshold for a lawful refusal there is higher than the national norm.
Other provinces use broadly similar two-stage processes, but the exact wording, the people who must attend the investigation, and the time limits differ. Confirm the procedure in your own province's OHS Act before you rely on the detail above.
When the refusal is not available
The refusal right has limits the law builds in. In several jurisdictions, certain workers whose own job is inherently dangerous (for example some emergency responders, or where a refusal would directly endanger another person's life) have a restricted right, on the logic that danger is a normal condition of that work. These exceptions are narrow and do not touch ordinary construction trades. If you are a tradesperson facing an unguarded edge, a live wire, or an unshored trench, the full right applies.
How a contractor should handle a refusal
From the other side of the table, a refusal is not an attack. Handle it like this:
- Take it seriously and investigate immediately. Treating it as troublemaking is both unlawful and a missed chance to fix a real hazard.
- Keep the worker safe and on the clock. They stay nearby in a safe place during stage one, not sent home as a penalty.
- Bring in the committee member. The worker representative is part of the stage-one investigation by law.
- Document the refusal and the outcome. A recorded, properly handled refusal is part of your due-diligence story (see Your OHS Duties as a Contractor).
- Never discipline. Reprisal is a separate offence. If the refusal was genuine, you have just been handed a hazard to fix before someone is hurt.
Common mistakes
- Treating a refusal as insubordination. It is a legal right, and disciplining a worker for it is an offence in its own right.
- Sending the worker home. During stage one they stay in a safe place nearby; they are not penalised for raising it.
- Assuming Alberta works like the rest. Alberta's "undue hazard" test is narrower, serious and immediate, and excludes chronic risks.
- Skipping the committee member. The worker representative is part of the stage-one investigation by statute.
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