Carbon Monoxide Alarm Requirements for Landlords in Ontario (2026 Guide)

Ontario’s updated Fire Code introduces stricter carbon monoxide alarm requirements for rental properties starting in 2026. Landlords are now responsible for ensuring proper installation, placement, and maintenance of CO alarms across all applicable units.

Failure to comply can result in fines and increased liability.

What Landlords Are Now Responsible For

Under the updated regulations, landlords must:

• Install CO alarms in all applicable rental units

• Ensure alarms are functioning properly

• Replace outdated or expired units

• Provide guidance to tenants on usage

Tenants are responsible for testing alarms and reporting issues.

👉 For full requirements, visit Carbon Monoxide Alarm Requirements for Landlords in Ontario

Where CO Alarms Must Be Installed

In rental properties, alarms must be installed:

• On every storey of each unit

• Within 10 metres of sleeping areas

• In units with fuel-burning appliances

• In buildings with attached garages

• In corridors of multi-unit buildings (when applicable)

What Happens If You Don’t Comply?

Non-compliance can lead to:

• Fines

• Legal liability

• Increased risk to tenant safety

This is not just a safety issue—it’s a legal obligation.

Best Practices for Landlords

• Conduct regular inspections

• Upgrade outdated alarms

• Ensure proper placement

• Use certified devices

• Document compliance

Managing Multi-Unit Properties

If you manage multiple properties or buildings:

• Consider bulk inspections

• Standardize alarm types

• Schedule maintenance cycles

Need Professional Help?

We help landlords ensure compliance across all units and buildings.

👉 Book a rental property inspection today

If you’re a homeowner or operate a care facility, requirements differ:

• Homeowners: Carbon Monoxide Alarm Requirements for Homes

• Retirement Homes: Carbon Monoxide Alarm Requirements for Care Facilities