Smoke & Carbon Monoxide Detectors: Building Code is the Minimum—Not the Goal

I realize this is a repeat post topic, but I have begun to see an increase in homes that conform to the minimum code (or less) and finding out that more and more are sleeping in basements (bedrooms, parties, etc.).

Smoke and carbon monoxide (CO) alarms are among the most affordable and effective life-saving devices you can install in your home. They provide critical early warning, giving your family valuable time to escape during a fire or evacuate before dangerous levels of carbon monoxide become life-threatening.

Ontario's Current Requirements

Ontario's requirements for smoke and carbon monoxide alarms are found in both the Ontario Building Code (O. Reg. 332/12) for new construction and major renovations, and the Ontario Fire Code (O. Reg. 213/07), which applies to all existing homes.

Smoke Alarms

The Ontario Building Code requires smoke alarms to be installed on every storey of a dwelling unit and outside all sleeping areas. In new homes, smoke alarms must be hardwired, interconnected, and equipped with a battery backup so that if one alarm activates, every alarm throughout the home will sound.

The Ontario Fire Code also requires every home to have working smoke alarms on every storey and outside all sleeping areas, and homeowners are responsible for ensuring they are maintained in working order.

Carbon Monoxide Alarms

Effective January 1, 2026, the Ontario Building Code requires carbon monoxide alarms to be installed on every storey of a dwelling containing a fuel-burning appliance or an attached garage, with alarms located adjacent to sleeping areas. Approved hardwired, battery-operated, or plug-in carbon monoxide alarms may be used where permitted by the manufacturer's installation instructions.

The Ontario Fire Code contains similar requirements for existing homes, ensuring that carbon monoxide protection is provided wherever there is a risk from fuel-burning appliances or attached garages.

These regulations provide an excellent baseline for home safety—but they should be viewed as the minimum legal standard, not the maximum level of protection.

Tripoint Tip: During our inspections, we recommend installing additional plug-in carbon monoxide alarms on larger levels of the home and in finished basements with bedrooms. Redundant protection can provide earlier warning if one alarm fails or if carbon monoxide originates farther from the required detector. It's a small investment that can make a significant difference when seconds count.

Why the Minimum Isn't Always Enough

Building codes establish the minimum legal standard for safety—they are not intended to represent the highest level of protection.

At Tripoint Inspections Inc., we strongly encourage homeowners to go beyond the minimum requirements by installing additional carbon monoxide alarms throughout the home.

For example:

• Install an additional plug-in CO alarm at the opposite end of larger floors.
• Consider having protection on both upper and lower sections of split-level homes.
• Add a secondary alarm on each level so there is redundancy if one unit fails unexpectedly.
• Test every alarm monthly and replace units according to the manufacturer's recommended lifespan, typically every 7 to 10 years.

Basement Bedrooms Deserve Extra Protection

This is especially important when family members sleep in basement bedrooms.

Carbon monoxide is colourless, odourless, and impossible to detect without an alarm. While today's code requirements provide a good level of protection, additional detectors can provide earlier warning in situations where a single alarm may not activate immediately because of distance, room layout, or the location of the gas source.

Extra alarms can help ensure that occupants sleeping in basement bedrooms receive the earliest possible warning, reducing the risk of carbon monoxide exposure before symptoms such as headache, dizziness, confusion, or unconsciousness occur.

Peace of Mind is Worth the Investment

A quality plug-in carbon monoxide alarm often costs less than a family meal out, yet it can provide years of protection. When combined with properly installed smoke alarms, these inexpensive devices significantly improve the safety of your home.

Remember: Meeting Ontario's Building Code means you've met the legal minimum. Going beyond it means you've taken an extra step to help protect the people who matter most.