Carbon Monoxide Alarms Now Required in Condo and Apartment Units Under Ontario Fire Code Changes

Carbon monoxide alarms in condos and apartments now mandatory

MISSISSAUGA — Residents living in apartments and condominium units across Ontario are being reminded of new carbon monoxide (CO) alarm requirements that came into effect on January 1, 2026, following amendments to the Ontario Fire Code.

According to Mississauga Fire and Emergency Services, the updated regulations expand existing CO alarm rules to better protect residents in multi-unit residential buildings, including condos and apartments.

Carbon monoxide is a colourless, odourless gas that can be fatal to both people and pets. Because it cannot be detected by human senses, fire officials say alarms are a critical line of defence against CO poisoning.

Who Must Have a Carbon Monoxide Alarm

A CO alarm is now required inside an apartment or condo unit if any of the following conditions apply:

• The unit contains a fuel-burning appliance, such as a gas stove or fireplace

• The unit is located directly above, below or beside a building service room

• The unit is located directly above, below or beside an attached garage

• The unit receives heat from a fuel-burning appliance located outside the unit, such as a furnace in a service room

Fire officials note that installing alarms in these situations increases early detection, particularly if a shared building system malfunctions and releases carbon monoxide.

Where Carbon Monoxide Alarms Must Be Installed

Under the updated Fire Code, CO alarms must be installed in the following locations within apartment and condo units:

• Adjacent to each sleeping area, such as hallways outside bedrooms

• On every storey of the unit, including lofts and penthouses

• In public corridors, if those corridors are heated by air from a fuel-burning appliance

Responsibility and Penalties

Landlords and property owners are responsible for installing and replacing required carbon monoxide alarms. Tenants, however, can face fines if they disable an alarm or fail to notify the owner when one is not functioning.

Failure to comply with the legislation can result in penalties starting at $235, and fines of up to $50,000 upon conviction. The rules apply to all residential properties, including condos, apartments, townhomes, detached homes, cottages, rental suites, care occupancies and retirement homes.

Maintaining Your Carbon Monoxide Alarms

Fire officials recommend residents:

• Test CO alarms monthly

• Replace alarms every 10 years or according to manufacturer instructions

• Have fuel-burning appliances and vents inspected annually

• Ensure alarms are not blocked by furniture or drapery

When purchasing a new alarm, residents are advised to look for a Canadian certification mark. Some devices combine smoke and carbon monoxide detection in a single unit.

Recognizing the Symptoms of CO Poisoning

Carbon monoxide poisoning can cause symptoms similar to the flu, including:

• Headaches

• Dizziness

• Chest pain

• Confusion

• Weakness

• Nausea or vomiting

Anyone who suspects CO exposure or hears their alarm sound should immediately move to fresh air and call 911.

Residents with questions about the new requirements can contact the Fire Prevention & Risk Reduction Division at 905-456-5700.

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