Ontario is rolling out new, strict carbon monoxide safety rules, and they'll affect almost every type of home across the province next year. Starting Jan. 1, 2026, updates to the Ontario Fire Code will expand where carbon monoxide alarms are required in houses, apartments, condos, as well as rental units, and here's everything you need to know. The provincial government notes that over 65 per cent of CO-related injuries and deaths in Ontario happen in the home, hence the updated regulations. Tenants will be responsible for notifying their landlord of any issues with the CO alarm in their unit. The provincial government also notes that it's against the law for anyone to remove the batteries or tamper with CO alarms in any way.