Carbon Monoxide Alarm Requirements for Landlords in Ontario
Ontario law requires landlords to install and maintain carbon monoxide alarms in rental properties with fuel-burning appliances or attached garages. Make sure your property meets current compliance standards.
Based on guidelines from the Ontario Office of the Fire Marshal
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Required in applicable rental units across Ontario
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Must be installed on every storey of the unit
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Required in buildings with fuel-burning equipment
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Required in hallways and corridors of multi-unit buildings
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Landlords are legally responsible for installation and maintenance
Ontario Carbon Monoxide Alarm Requirements for Landlords (2026 Update)
As of January 1, 2026, updates to the Ontario Fire Code have expanded where carbon monoxide alarms are required in rental properties. These changes place clear responsibility on landlords to ensure proper installation, maintenance, and compliance in all applicable units.
Key Requirements for Landlords
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Carbon monoxide alarms must be installed in all rental units with fuel-burning appliances
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Alarms are required in units with attached garages
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Alarms must be installed on every storey of each rental unit
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In apartment and condo buildings, alarms are required in corridors if fuel-burning equipment is present
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Alarms must be located within 10 metres of sleeping areas
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All devices must meet approved Canadian safety standards (CSA, ULC, or equivalent)
Failure to meet these requirements can result in fines and increased liability for property owners. Ensuring your rental property is properly equipped with carbon monoxide alarms is essential for both tenant safety and legal compliance.
Where Carbon Monoxide Alarms Must Be Installed in Rental Properties
Proper placement of carbon monoxide alarms in rental properties is essential for compliance with Ontario regulations.
Landlords must ensure alarms are installed in all required areas to protect tenants and meet legal standards.
Required Locations Include:
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On every storey of each rental unit, including basements
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Within 10 metres (33 feet) of all sleeping areas
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Inside units with fuel-burning appliances such as furnaces or water heaters
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In buildings with fuel-burning equipment, alarms must be installed in hallways and common corridors
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In units connected to attached garages where CO exposure is possible
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In locations where alarms are clearly audible to occupants
Improper placement or missing alarms can result in non-compliance and increased liability for property owners.
Types of Carbon Monoxide Alarms for Rental Properties
Landlords can choose from several types of carbon monoxide alarms depending on the property layout and installation requirements. All devices must meet Canadian safety standards, but selecting the right type is important for ensuring compliance and proper coverage across rental units.
Hardwired CO Alarms
Installed directly into a property’s electrical system, hardwired carbon monoxide alarms are commonly used in multi-unit buildings or during renovations to ensure consistent, long-term protection.
✔ Reliable power source
✔ Can be interconnected across units or floors
✔ Ideal for multi-unit and larger properties
Battery-Operated CO Alarms
Battery-operated units are often used in rental properties where wiring is not available. They provide flexibility but require regular maintenance to remain compliant.
✔ Easy installation
✔ Suitable for individual units
✔ Requires regular battery replacement
Plug-In CO Alarms
Plug-in carbon monoxide alarms are commonly used in rental units for quick installation and reliable monitoring, often with battery backup included.
✔ Quick setup
✔ Backup battery included
✔ Ideal for bedrooms and common areas
All carbon monoxide alarms installed in rental properties must meet approved Canadian safety standards such as CSA 6.19, ULC 218, or equivalent certifications.
Do Your Rental Properties Require Carbon Monoxide Alarms?
Under Ontario regulations, most rental properties are required to have carbon monoxide alarms. If your property contains fuel-burning appliances or has an attached garage, these requirements apply and must be addressed by the landlord.
Your rental property likely requires CO alarms if it includes:
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A gas or propane furnace
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A fuel-powered water heater
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A fireplace (gas or wood-burning)
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A gas stove or oven
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A fuel-burning dryer
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An attached garage, even without appliances
If you’re unsure whether your rental property meets current Ontario requirements, a professional compliance inspection can confirm proper installation and help reduce liability.
Rental Property CO Alarm Installation & Compliance Services
Ensuring your rental property meets Ontario’s carbon monoxide alarm requirements isn’t just about installation — it’s about protecting your tenants and meeting legal obligations. Improper placement, missing alarms, or outdated units can result in non-compliance and increased liability.
Our CO Alarm Services for Landlords Include:
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Full rental property compliance inspections
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Proper alarm placement across all units and floors
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Installation of hardwired, battery, or plug-in systems
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Upgrading outdated or non-compliant alarms
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Ensuring compliance with Ontario Fire Code regulations
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Support for multi-unit buildings and rental portfolios
We help landlords ensure their properties meet current Ontario safety standards while reducing risk and maintaining compliance.
Serving landlords and property owners across Fergus, Elora, Guelph, Orangeville, and surrounding areas.
We also support multi-unit buildings and bulk installations for landlords managing multiple properties.
Carbon Monoxide Alarm Requirements FAQs
Ensure Your Rental Property Meets Ontario CO Alarm Requirements
Don’t risk non-compliance or liability. Our team can inspect your rental units, install compliant carbon monoxide alarms, and ensure your property meets current Ontario Fire Code requirements.
Fast, reliable service trusted by landlords and property owners.
Ontario regulations have changed — make sure your rental property is compliant.