Smoke and CO Alarm Placement Under BC Code (Home Systems)

Smoke and CO Alarm Placement Under BC Code

idea

Claim: BC Building Code requires smoke alarms on every level, outside every sleeping area, and inside every bedroom in new construction or major renovation — all interconnected so that one activation sounds all units. CO alarms are required wherever there is a fuel-burning appliance or attached garage. Hardwired interconnection is mandatory for new builds; wireless interconnect on 10-year sealed batteries is the accepted retrofit path for existing homes.

Mechanism

The BC Building Code (currently the 2024 edition, incorporating the National Building Code) sets minimum requirements for smoke and CO alarm placement and type. Local amendments (City of Vancouver, City of Burnaby, etc.) may be more stringent.

Smoke alarm requirements

Location (where they must be):

• On every storey of the dwelling, including finished basement
• Outside every sleeping area (in the hallway or landing serving the bedrooms)
• Inside every bedroom — required for new construction and major renovations¹

Interconnection:

• All smoke alarms must be interconnected — when one sounds, all sound¹
• In new construction and major renovations: hardwired interconnected units are the standard
• In existing homes where running new wiring is impractical: wireless interconnect is permitted, provided the units use 10-year sealed lithium batteries (not replaceable AA batteries)¹

Replacement trigger:

• Smoke alarms must be replaced every 10 years regardless of condition¹
• Any unit that fails to sound on the test button, yellows, or shows physical damage must be replaced immediately

CO alarm requirements

When required:

• Any dwelling with a fuel-burning appliance (gas furnace, gas water heater, gas fireplace, gas stove, oil furnace)
• Any dwelling with an attached garage, or sharing a wall or floor with a parking garage or service room containing a fuel-fired appliance¹

Location:

• Outside every sleeping area (in the hallway serving bedrooms)
• On every floor where a fuel-burning appliance is located

Replacement trigger:

• CO alarms have a sensor life of 7–10 years depending on the model — replace at the date marked on the unit, or when the unit signals end-of-life

Strata-specific notes

• Townhomes and condos in BC require hardwired interconnected smoke alarms¹
• Basement suites require interconnection with the main home unless there is a fire separation rated for 45 minutes or more between the units
• The strata corporation is responsible for alarms in common areas; owners are responsible for in-suite alarms

Scope

• Covers residential smoke and CO alarm placement under BC Building Code for dwellings.
• The smoke-co-detectors note covers maintenance procedures (testing, battery replacement, replacement timing) in more detail. → smoke-co-detectors (Home Systems)
• Does NOT cover commercial buildings, industrial occupancies, or fire suppression systems.
• Does NOT govern the specific City of Vancouver Fire Bylaw requirements, which may exceed the provincial BC Building Code minimums — check with the City of Vancouver Building Department for local amendments.

Why it connects to wiring circuits

When a full rewire or aluminum wiring remediation is done under a Technical Safety BC electrical permit, the permit inspection will verify that smoke alarms and CO alarms meet current code. If the home’s existing detectors are out of date (wrong placement, not interconnected, over 10 years old), the inspection can flag deficiencies. Owners undertaking a full rewire should treat the project as an opportunity to bring the entire alarm system to current code in a single permitted scope, rather than discovering deficiencies in a separate inspection later.

Sources

Idea Compass

North: Where this comes from

• BC Building Code 2024 — the governing standard for alarm placement
• wiring-circuits (Home Systems) — the parent component note; alarm compliance is triggered when electrical permits are pulled for wiring work
• Electrical (Home Systems) — parent system

East: Tensions / failure

• Wireless interconnect vs hardwired — acceptable retrofit vs preferred standard; wireless interconnect requires 10-year sealed batteries to be a valid substitute, not standard AA batteries

South: Where this leads

• smoke-co-detectors (Home Systems) — the maintenance procedures (testing, battery, replacement schedule) that keep the placed alarms functional
• wiring-circuits (Home Systems) — the electrical permit context in which alarm deficiencies are most often discovered and corrected

West: What’s similar

• GFCI Required Locations in BC — Canadian Electrical Code Rule 26-700 (Home Systems) — another BC code placement requirement that is checked at electrical permit inspection
• AFCI-and-GFCI-Breakers-Are-Required-When-a-Panel-Is-Replaced-in-BC (Home Systems) — another code compliance trigger on electrical permit work

Footnotes

1. ProAmp Electric — BC smoke detector and CO alarm requirements: placement on every level and outside every sleeping area; interconnection required; hardwired in new construction; 10-year sealed batteries acceptable retrofit; smoke alarms replace every 10 years, CO alarms every 7–10 years — https://proampelectric.ca/smoke-detector-requirements-bc/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶