Fire and Carbon Monoxide Safety Requirements for Ontario Landlords

Fire safety is one area where Ontario landlords have clear, non-negotiable legal obligations — and the penalties for non-compliance aren't just fines. If a tenant is injured because a required smoke alarm wasn't installed or maintained, the legal and personal consequences can be severe.

Here's what you need to know.

Smoke Alarms: What the Law Requires

Under Ontario's Fire Protection and Prevention Act and the Ontario Fire Code, landlords must install working smoke alarms:

• On every storey of the dwelling unit
• Outside every sleeping area (typically in the hallway adjacent to bedrooms)
• In every sleeping room if the door is typically kept closed while sleeping

This applies to all residential rental properties — detached houses, basement apartments, duplexes, and multi-unit buildings. There are no exemptions for older properties.

Hardwired vs. Battery-Operated

For existing buildings, battery-operated alarms are permitted as long as they meet current standards. For newly constructed units or renovations requiring permits, hardwired interconnected alarms are typically required.

Interconnected alarms — where triggering one alarm sets off all alarms in the unit — are considered best practice in multi-storey units and are required in new construction. They give occupants on upper floors an earlier warning of fires that start below.

Landlord Maintenance Responsibilities

You are responsible for:

• Ensuring alarms are installed in the correct locations
• Testing alarms at the start of every new tenancy (document this on your move-in inspection report)
• Replacing alarms that are at end of life — most smoke alarms have a lifespan of 8–10 years, and there's a manufacture date on the back
• Replacing alarms after they have been activated in a fire

Tenants are responsible for:

• Not removing or disabling the alarm
• Notifying you if an alarm is not working
• Replacing batteries as needed (for battery-operated units)

If a tenant disables a smoke alarm and there is a fire, there are liability implications for both parties. Document alarm status at each annual inspection.

Carbon Monoxide Detectors: The 2015 Rule

Since April 15, 2015, Ontario law requires landlords to install a carbon monoxide (CO) detector adjacent to every sleeping area in a unit that contains:

• A fuel-burning appliance (gas furnace, gas stove, gas fireplace, oil furnace)
• A fireplace of any type
• An attached or built-in garage

CO is colourless and odourless — tenants cannot detect a leak without a working detector. This rule has saved lives since it came into effect, and compliance is not optional.

Combination Alarms

Many landlords use combination smoke/CO alarm units, which satisfy both requirements in a single device. These are widely available, straightforward to install, and reduce the number of devices you need to track and maintain.

Make sure any combination unit is certified for both functions (look for ULC certification on the packaging).

Multi-Unit Buildings: Additional Requirements

If you own a building with three or more units, additional Fire Code requirements apply, including:

• Fire safety plans — a documented plan filed with your local fire department describing emergency procedures, occupant roles, and equipment locations
• Exit signage and emergency lighting — required in common areas
• Fire separations — walls and floors between units must meet fire-resistance ratings
• Annual fire drills — required in some building types; check with your local fire marshal's office

In London, the London Fire Department offers free fire safety inspections for rental properties. In Sarnia and St. Thomas, contact the local fire department for equivalent services. These inspections are genuinely helpful — inspectors will identify issues before they become violations.

Inspections and Documentation

Whether you manage one property or twenty, build fire safety into your regular maintenance schedule:

• At each new tenancy: Test all alarms, document results on the move-in inspection report, and give the tenant written confirmation that alarms are working
• Annually: Re-test all alarms, check manufacture dates, replace any unit older than 10 years
• At move-out: Test again and note any tampering or missing devices

If a tenant reports a defective alarm, treat it as urgent — respond and fix it within 24 hours. A paper trail showing prompt response is important if questions ever arise.

The Penalties for Non-Compliance

Ontario Fire Code violations can result in:

• Fines of up to $50,000 for individuals under the Fire Protection and Prevention Act
• Orders to vacate the unit until violations are corrected
• Potential civil liability if a tenant is harmed due to non-compliant equipment

Fire inspectors can and do conduct inspections of rental properties — particularly after a complaint or following an incident. "I didn't know" is not a defence.

Practical Checklist for Ontario Landlords

• Smoke alarm on every floor and outside every sleeping area
• CO detector adjacent to every sleeping area (if applicable)
• All units under 10 years old (check manufacture date)
• Alarms tested and documented at start of each tenancy
• Annual inspection schedule in place
• Tenants know what to do if an alarm sounds

Getting It Right From the Start

Frequently Asked Questions

How many smoke alarms does an Ontario landlord need to install?

Ontario's Fire Code requires at least one working smoke alarm on every storey of the unit and outside every sleeping area. If tenants typically sleep with their bedroom doors closed, a smoke alarm inside each sleeping room is also required. There is no exemption for older buildings — the requirement applies to all residential rental properties.

When did Ontario require landlords to install carbon monoxide detectors?

Since April 15, 2015, Ontario landlords have been required to install a CO detector adjacent to every sleeping area in any unit that contains a fuel-burning appliance (gas furnace, gas stove, gas fireplace, oil furnace), any type of fireplace, or an attached or built-in garage.

How often should a landlord replace smoke alarms in a rental property?

Most smoke alarms have a lifespan of 8–10 years. The manufacture date is printed on the back of the unit. Landlords are responsible for replacing alarms that have reached end of life, have been activated in a fire, or are otherwise not functioning. Tenants are responsible for replacing batteries in battery-operated units and for not disabling alarms.

What are the fines for Ontario Fire Code violations in rental properties?

Under the Fire Protection and Prevention Act, individuals can be fined up to $50,000 for Ontario Fire Code violations. More serious consequences can include orders to vacate the unit and potential civil liability if a tenant is harmed due to non-compliant equipment. Fire inspectors can conduct inspections of rental properties — especially following a complaint or incident.

Can a landlord be held liable if a tenant removes a smoke alarm?

Liability depends on the circumstances. If a tenant disables a smoke alarm, the tenant bears responsibility for that action — but a landlord who fails to document alarm condition at inspections, or who is aware of tampering and doesn't address it, may still face scrutiny. Documenting smoke alarm status at each new tenancy and during annual inspections is essential protection.

For more on your ongoing obligations to tenants, see our guide to landlord maintenance responsibilities in Ontario. If you've recently acquired a rental property or are setting one up for the first time, a property management company like Prospera Properties can do a comprehensive safety walkthrough before your first tenant moves in. Getting the fundamentals right — including fire safety — protects your tenants and protects you.

It's one of those areas where the cost of doing it correctly is trivial compared to the cost of getting it wrong.