Where do carbon monoxide alarms have to go in Ontario?
Researched by the LokalMatch editorial team1 answer
We have a gas furnace and an attached garage, and I don’t know whether one alarm in the hallway is enough.
Answers (1)
LokalMatch EditorialLokalMatch editorial
Adjacent to every sleeping area, and since 1 January 2026, on every storey of the home — including storeys with no bedrooms at all. The requirement lives in Ontario’s Fire Code and applies to any home with a fuel-burning appliance, a fireplace or an attached garage. The 2026 change also brought in homes heated by air from a fuel-burning appliance that is not inside the home.
Adjacent to a sleeping area means the hallway or space outside the bedroom, not inside it.
The building owner carries the duty. In a rental that is the landlord, who has to install, maintain and test the alarms; the tenant’s job is to report a problem. And removing the batteries or tampering with a carbon monoxide alarm is against the law in Ontario, which is worth knowing before someone pulls one down because it chirped at 3 a.m.
Answers come from pros and are reviewed by LokalMatch before they’re published. They’re general information — for regulated or safety-critical work, have a licensed professional assess your situation.
Sources
Where the facts on this page come from.
Carbon monoxide safety — Government of Ontario (accessed September 21, 2026)
Fire Code, O. Reg. 213/07 — Government of Ontario (accessed September 21, 2026)