British Columbia · Home health · checked September 28, 2026

Carbon monoxide testing and CO alarms in Saanich

Carbon monoxide is odourless and can kill. B.C. doesn't require CO alarms in existing homes; the province recommends them wherever there's a fuel-burning appliance, fireplace or attached garage, and the building code requires them in new homes.

A carbon monoxide alarm on an upstairs hallway wall outside the bedrooms at night

CO alarm rule

Not required in existing homes

Natural gas heat

23%

Single-detached share

47%

Alarm cost

$40–$80 each

How Saanich is built

Saanich's houses by when they were built Ten house shapes, one for each tenth of Saanich's 37,620 houses. Before 1961: 28%, 1961–1990: 50%, 1991–2000: 11%, 2001 or later: 11%. Older houses glow hotter.
  • Before 1961 28%
  • 1961–1990 50%
  • 1991–2000 11%
  • 2001 or later 11%
Each house stands for one in ten of Saanich's 37,620 houses (single-detached, semi-detached, row and duplex), drawn by when it was built. The glow shows the usual pattern: older houses tend to be leakier and less insulated. Snowfall scales with heating degree-days. Sources: Statistics Canada 2021 Census (table 98-10-0233-01), NRCan HOT2000 climate data.

The rule in British Columbia

B.C. doesn't require CO alarms in existing homes; the province recommends them wherever there's a fuel-burning appliance, fireplace or attached garage, and the building code requires them in new homes.

Where CO alarms go: installation rules in British Columbia

What the rules say about installing alarms:

  • Not required in existing homes; the province recommends alarms wherever there's a fuel-burning appliance, a fireplace or an attached garage.
  • New homes served by or containing a fuel-burning appliance, or with an attached garage, need CO alarms under the BC Building Code.
  • For new houses, the National Building Code 2020 (Article 9.32.3.9) requires a CO alarm inside each bedroom or within 5 m outside each bedroom door when the home has a fuel-burning appliance or an attached garage, an alarm in any room with a solid-fuel-burning appliance (on or near the ceiling unless the maker's instructions say otherwise), and interconnected alarms in a house with a secondary suite.

CO sources in Saanich homes

In the Victoria area, the main heating energy is natural gas for 23% of households (Statistics Canada, 2023). Any fuel-burning appliance, fireplace or attached garage is a potential CO source.

Single-detached houses make up 47% of Saanich's households; many have an attached garage, another reason to put an alarm near the door into the house.

What a CO check involves

  • Alarms next to sleeping areas and on every storey, tested monthly and replaced by their end-of-life date (usually 7 to 10 years).
  • Annual service of fuel-burning appliances by a licensed technician.
  • A combustion spillage test during an energy evaluation, which catches a venting problem before it produces CO.

Our carbon monoxide guide · Combustion safety testing in Saanich

Carbon monoxide testing in Saanich: common questions

Are carbon monoxide alarms mandatory in Saanich?

B.C. doesn't require CO alarms in existing homes; the province recommends them wherever there's a fuel-burning appliance, fireplace or attached garage, and the building code requires them in new homes.

Where should CO alarms go in British Columbia?

Not required in existing homes; the province recommends alarms wherever there's a fuel-burning appliance, a fireplace or an attached garage. New homes served by or containing a fuel-burning appliance, or with an attached garage, need CO alarms under the BC Building Code. For new houses, the National Building Code 2020 (Article 9.32.3.9) requires a CO alarm inside each bedroom or within 5 m outside each bedroom door when the home has a fuel-burning appliance or an attached garage, an alarm in any room with a solid-fuel-burning appliance (on or near the ceiling unless the maker's instructions say otherwise), and interconnected alarms in a house with a secondary suite.

How long do CO alarms last?

Most have an end-of-life date of 7 to 10 years printed on the unit; replace them by then even if they still beep when tested.

Carbon monoxide testing near Saanich

Ask about carbon monoxide testing in Saanich

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