Ontario is strengthening residential safety standards with updated carbon monoxide (CO) alarm requirements under the Ontario Fire Code, effective January 1, 2026. These changes directly impact homeowners, landlords, and property managers across Ontario.
Carbon monoxide is a serious safety risk that cannot be seen or smelled. As a result, compliance with the new rules is not only a legal obligation but also a critical responsibility for protecting occupants and managing liability. This article explains the updated requirements, who must comply, and how property owners can prepare.
What Is Carbon Monoxide and Why It Matters
Carbon monoxide is produced when fuels such as natural gas, propane, oil, wood, or gasoline burn incompletely. In residential settings, common sources include furnaces, boilers, water heaters, fireplaces, gas stoves, and attached garages.
Exposure to carbon monoxide may cause headaches, dizziness, nausea, confusion, or loss of consciousness. In severe cases, it can be fatal. Because carbon monoxide cannot be detected by human senses, approved carbon monoxide alarms are the only reliable means of early warning.
Ontario Fire Code Changes Taking Effect in 2026
Carbon Monoxide Alarms on Every Storey
Under the updated Ontario Fire Code, carbon monoxide alarms must be installed on every storey of a residential building if the building contains:
- A fuel-burning appliance
- A fireplace
- An attached garage
This requirement applies regardless of whether bedrooms are located on that floor. Previously, alarms were typically required only near sleeping areas. The new rule expands coverage to improve early detection throughout the building.
Continued Requirement Near Sleeping Areas
In addition to every storey, carbon monoxide alarms must continue to be installed adjacent to sleeping areas to ensure occupants receive warning during overnight hours.
Buildings Covered by the New Requirements
The expanded rules apply to most residential and residential-type buildings, including:
- Detached, semi-detached, and townhouses
- Condominium units and apartment buildings
- Hotels, motels, and retirement homes
- Buildings where fuel-burning equipment is located outside the dwelling unit, such as in a mechanical room or detached structure
Carbon Monoxide Alarm Types and Standards
Carbon monoxide alarms installed to meet Ontario Fire Code requirements must:
- Be battery-operated, plug-in, or hardwired
- Be installed in accordance with the manufacturer’s instructions
- Meet recognized Canadian safety standards such as CSA or ULC certification
In some newer or multi-unit buildings, interconnected alarm systems may be required.
Responsibilities of Landlords and Property Owners
Landlords and Building Owners
Landlords and building owners are legally responsible for:
- Installing all required carbon monoxide alarms
- Ensuring alarms remain in working condition
- Replacing expired or defective alarms
These obligations apply to all rental properties, including single-family rentals and multi-unit residential buildings.
Tenant Responsibilities
Tenants are expected to:
- Avoid tampering with carbon monoxide alarms
- Notify the landlord promptly if an alarm is missing, damaged, or not functioning properly
Compliance Deadline
All applicable properties must meet the updated requirements no later than January 1, 2026. Existing buildings are not exempt once the compliance date is reached.
Penalties for Non-Compliance
Failure to comply with the Ontario Fire Code may result in enforcement action, including:
- Fines of up to $50,000 for individuals
- Higher fines for corporations
- Orders issued by local fire departments under the Fire Protection and Prevention Act
Best Practices for Property Owners
To maintain compliance and reduce risk, property owners should:
- Conduct a full audit of existing carbon monoxide alarm coverage
- Confirm alarms are installed on every storey and near sleeping areas
- Replace alarms according to manufacturer service-life guidelines, typically seven to ten years
- Test alarms regularly and keep maintenance records
- Arrange annual inspections of fuel-burning appliances by licensed professionals
Final Thoughts
Ontario’s updated carbon monoxide alarm requirements represent a meaningful step forward in residential safety. With the January 1, 2026 deadline approaching, landlords and property owners should act early to ensure their properties are fully compliant.
At Xtends Rental Management Inc., we support landlords and real estate professionals by managing compliance requirements with clarity and professionalism, helping protect tenants while preserving long-term property value.