How to Choose a Smoke Alarm in Canada

A smoke alarm only helps if it’s in the right spot, has power and isn’t past its replacement date. Clocks go back on Sunday, Nov. 1 in most of Canada, so it’s a good time to check yours. Here’s what Canadian fire-safety guidance says, plus four alarms to consider if one needs replacing.

Prefer to watch? Here’s the video walkthrough of how to choose a smoke alarm.

Short versions: where a smoke alarm goes · when to replace it · ionization or photoelectric.

How many smoke alarms does a home need?

The Government of Canada’s home fire prevention booklet says the minimum is an alarm on every level of your home and near each sleeping area, with one in every bedroom for more protection. Parachute, the national injury-prevention charity, adds the basement to the list, and says to put one inside each bedroom if you sleep with the door closed.

Where should they go?

• Put alarms on the ceiling, since smoke rises.
• Keep them away from bathrooms, heating appliances, windows, doors and ceiling fans, where drafts can interfere.
• On a ceiling, mount the alarm at least 4 inches (10 cm) from the nearest wall. On a wall, put it 4 to 12 inches (10 to 30 cm) below the ceiling.

Ionization or photoelectric?

Ionization alarms respond faster to flaming fires. Photoelectric alarms pick up smouldering fires sooner and are less affected by normal cooking. The booklet says both give good protection, and Parachute suggests photoelectric alarms for kitchens because they’re less likely to go off from cooking or shower steam.

Battery or hardwired?

Alarms can be wired into your home’s electrical system, run on batteries, or do both. A hardwired alarm with a backup battery keeps working in a power cut, and some can be linked so that when one sounds, they all sound. A sealed 10-year battery means no battery changes, but you still need to press the test button every month.

How often to test and replace

• Test every alarm monthly with its test button.
• Put in a new battery once a year if your alarm uses replaceable batteries. Parachute says safety experts suggest doing it when you change your clocks.
• Replace alarms that are more than 10 years old.
• Every six months, vacuum gently with a soft brush. Shut off the power first if the alarm is wired in, then test it.

Before you buy

• Look for a Canadian certification mark on the alarm and on the box. The booklet says to choose a model listed by a recognized lab, such as ULC or cUL.
• A hush button silences a nuisance alarm for about 7 to 10 minutes.
• Want carbon monoxide detection too? A combination alarm covers both, and our carbon monoxide alarm guide covers where to put one.
• Plan your way out. Find two ways out of each room, pick a meeting place outside, and call 9-1-1 once everyone is outside.

Sources: Government of Canada, Home fire prevention booklet (National Defence), Parachute, Smoke alarms (reviewed December 4, 2025) and timeanddate.com, 2026 clock change. Model details come from the listings, so check the product page before you order.