Ontario Carbon Monoxide Alarm Law Changes (2026): What Homeowners Need to Know

As of January 1, 2026, updates to the Ontario Fire Code have expanded where carbon monoxide (CO) alarms are required in residential properties. These changes are designed to improve safety and reduce the risk of carbon monoxide exposure in homes across Ontario.

If you own a home, understanding these new requirements is essential to ensure your property is compliant and properly protected.

What Changed in 2026?

The updated Ontario Fire Code now requires carbon monoxide alarms in more areas of residential homes than before.

Key changes include:

• CO alarms must be installed on every storey of the home

• Required in homes with fuel-burning appliances

• Required in homes with attached garages

• Must be installed within 10 metres of sleeping areas

These updates expand beyond previous rules that focused mainly on sleeping areas.

👉 For a full breakdown, see our Carbon Monoxide Alarm Requirements for Homeowners in Ontario page.

Do All Homes Need CO Alarms?

Not all homes require carbon monoxide alarms.

You are required to install them if your home includes:

• Gas or propane furnace

• Fuel-powered water heater

• Fireplace (gas or wood)

• Gas stove or oven

• Attached garage

Homes that are fully electric with no attached garage are typically exempt.

Why These Changes Matter

Carbon monoxide is a colorless, odorless gas that can be extremely dangerous.

These updated regulations are intended to:

• Improve early detection

• Increase coverage throughout the home

• Reduce fatalities and injuries

Proper placement is just as important as installation.

Installation & Compliance Tips

To stay compliant:

• Install alarms on every level

• Place alarms near sleeping areas

• Use certified devices (CSA / ULC approved)

• Test alarms monthly

• Replace units every 5–10 years

Need Help Ensuring Compliance?

If you’re unsure whether your home meets the new requirements, a professional inspection can help.

👉 Learn more about our services or👉 Book a CO alarm inspection to ensure your home is compliant.

If you own rental properties or manage buildings, requirements may differ:

• Landlords: See Carbon Monoxide Alarm Requirements for Landlords

• Care Facilities: See Carbon Monoxide Alarm Requirements for Retirement Homes