Ontario’s updated carbon monoxide (CO) safety regulations take effect Jan. 1, 2026, bringing stricter alarm requirements to homes, apartments, condos and rental units across the province in an effort to reduce injuries and deaths linked to the “silent killer.”
The changes, introduced under the revised Ontario Fire Code, expand where CO alarms must be installed and place new responsibilities on homeowners, landlords and property managers. Provincial data shows more than 65 per cent of CO‑related injuries and fatalities occur in residential settings.
Carbon monoxide is an invisible, odourless gas produced when fuels such as natural gas, propane or wood do not burn completely in appliances like furnaces, stoves, water heaters and fireplaces.
Under the new rules, houses must have CO alarms if they contain a fuel‑burning appliance, fireplace or attached garage, or if they are heated by air from a fuel‑burning appliance located outside the residence. Alarms must be installed adjacent to each sleeping area and on every storey, including those without bedrooms.
Apartments and condominiums face similar requirements. Units with fuel‑burning appliances or fireplaces, or those located above, below or beside a service room or garage, must have alarms on every storey and near sleeping areas. Units heated by air from a fuel‑burning appliance outside the suite also require alarms. Public corridors heated by such systems must be equipped as well.
“Carbon monoxide is called the silent killer for a reason — it’s invisible, odourless and can be deadly,” Fire Chief Chris Case said. “These new rules will save lives by ensuring alarms are installed where they’re needed most. We urge every homeowner, tenant and property manager to act now and protect their families.”
Residents are encouraged to check their homes for fuel‑burning appliances or attached garages, install alarms in required locations before Jan. 1, and test devices regularly. Batteries should be replaced as needed.
Those needing assistance can request a CHiRP Home Alarm Check through ckfire.ca..
More information on the new CO legislation is available at ontario.ca..