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  New Carbon Monoxide Alarm Requirements in Ontario: What Homeowners & Buyers Need to Know in 2025 As a real estate professional serving Ontario property buyers and sellers, it’s important to stay on top of safety regulations that affect homes across the province. One of the most significant updates coming into effect soon relates to carbon monoxide (CO) alarm requirements — a change that impacts homeowners, landlords, and prospective buyers alike. Why This Matters Carbon monoxide is often called the “silent killer” because it is colourless, odourless, and tasteless — and you can’t detect it without a working alarm. Exposure to elevated levels of CO can cause serious health issues and even death if not caught early. Ontario To enhance safety and help protect families across Ontario, the provincial government has updated the Ontario Fire Code to expand where and when carbon monoxide alarms must be installed. Ontario Association of Fire Chiefs Key Changes Comi...