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New CO Alarm Rules in Ontario: Are You Fully Protected?

March 24, 2026

Ontario has strengthened its carbon monoxide alarm requirements as of January 1, 2026, expanding where alarms must be installed in homes and residential buildings. The goal is simple: improve early detection and reduce the risks associated with carbon monoxide exposure.

Carbon monoxide is often called the “silent killer” because it has no smell, taste, or colour. It is produced by common household equipment such as furnaces, gas appliances, fireplaces, and vehicles running in attached garages. Without a functioning CO alarm in the right location, dangerous levels can go unnoticed until it’s too late.

If your home has any fuel-burning appliance (such as a hot water tank heated by natural gas), a fireplace, an attached garage, or is heated by an external fuel source, you are required by law to have CO alarms.

The New Rule and Where CO Alarms Must Be Installed

If your home meets any of the conditions above, you must install a CO alarm in these two locations:

  1. Adjacent to each sleeping area (near all bedrooms).
  2. Effective Jan 1, 2026: On every storey (floor) of your home, including storeys that do not have a sleeping area.

This applies to houses, townhomes, and condos alike.

What Landlords and Tenants Need to Know

Landlords are responsible for:

  • Installing CO alarms where required
  • Keeping them in working condition
  • Testing them annually and between tenancies
  • Providing tenants with proper usage and maintenance instructions

Tenants are responsible for:

  • Testing alarms regularly (monthly is recommended)
  • Report any issues immediately
  • Never tamper with or disable the alarm

Why This Matters

Carbon monoxide poisoning remains a leading cause of accidental poisoning in Ontario. The updated rules bring broader protection by ensuring every level of a home is monitored, helping detect rising CO levels sooner and giving occupants more time to respond.

Simple Safety Reminders

  • Test CO alarms monthly
  • Replace batteries as recommended
  • Replace units every 7–10 years (or per manufacturer guidelines)
  • Have fuel-burning appliances professionally inspected annually
  • If an alarm sounds, get outside immediately and call 9-1-1

The latest updates to Ontario’s Fire Code reinforce the importance of comprehensive CO alarm coverage throughout your home. Ensuring alarms are installed on every level and near bedrooms helps provide earlier warning and more time to react. Staying compliant isn’t just about meeting regulations, it’s about protecting the people who matter most.