Alberta’s building code requires a smoke alarm on every storey of a home including the basement, in every bedroom, and in the hallway serving the bedrooms, all interconnected so that when one sounds they all sound, hardwired with battery backup. Carbon monoxide detection is required in dwelling units too, in or near each bedroom, and can be a combined smoke and CO unit. Replace every alarm, wired or battery, after 10 years.
Which code applies, and to whom
Alberta enforces the National Building Code 2023 Alberta Edition, in force since 1 May 2024. Any building permit applied for on or after that date has to meet it, including basement developments and secondary suites. The alarm rules live in Section 9.10.19 and the related CO provisions.
The code sets the standard for new construction and permitted renovations. Nobody is going to inspect a 1978 bungalow and demand it meet the 2023 rules unless you open a permit. But the moment you finish a basement, add a suite or rewire, the inspector will expect the alarm layout in this post, and your insurer and your family expect it regardless. Treat the code as the minimum for every home, not just new ones.
Where smoke alarms go and how they connect
- Every storey, including the basement. A split-level counts each level.
- Every bedroom, or any room someone sleeps in.
- The hallway serving the bedrooms, or the space between the sleeping rooms and the rest of the storey when there is no hallway.
Placement details matter. Alarms go on the ceiling or high on a wall per the manufacturer’s instructions, away from the dead air in a corner, and not right beside a bathroom door where steam will set them off. Kitchens are the usual nuisance-trip spot; a photoelectric alarm or one with a hush button a few metres from the stove does better than an ionization unit above it. The installation standard the code references is CAN/ULC-S553, which is what your electrician follows.
Interconnection: battery or hardwired?
Both. The code calls for alarms that are hardwired to the house electrical system with battery backup, and interconnected so that one activation sounds every alarm in the home. A fire in the basement at 3 am has to wake someone on the second floor, and a single battery alarm at the top of the stairs cannot do that.
Interconnection can be done two ways:
- Wired interconnect: a third conductor runs between alarm locations. Standard in new construction and the cleanest option when walls are open.
- Wireless interconnect: the alarms talk to each other by radio. The code accepts this, but the units must still be hardwired for power with battery backup and must meet CAN/ULC-S531. Wireless interconnect is how we bring an older home up to current layout without opening every ceiling.
Battery-only alarms with no interconnection are what most Edmonton homes built before the 1990s still have. They are better than nothing and you should keep them working, but they are not what the current code describes, and any permitted renovation will trigger an upgrade.
Carbon monoxide alarms
Carbon monoxide is odourless and the symptoms feel like the flu. Nearly every Edmonton home has a gas furnace and water heater, and many have an attached garage, so CO is a real risk here from October to April when windows stay shut. The Alberta building code requires CO detection in dwelling units, and a combined smoke and CO alarm satisfies both requirements in one device.
Guidance from the Safety Codes Council puts CO alarms inside each bedroom or in the hallway within 5 metres of the bedroom doors, measured along the corridor. Health Canada adds that every home with a combustion appliance should have at least one CO alarm with battery backup, with the hallway outside sleeping areas the most important spot. CO alarms must conform to CAN/CSA-6.19 and carry an end-of-life date on the label; when it beeps a different pattern than the low-battery chirp, read the label before you reach for a battery.
Whole-home surge protection often gets installed on the same visit as an alarm upgrade, because both live at the panel and both protect the things you cannot replace. Our smoke, CO and surge protection page explains the options.
Secondary suites change the rules
If your home has a basement suite, or you are building one, the alarm requirements get stricter. Smoke alarms are required in every ancillary and common space of the house (furnace room, shared laundry, shared entry), and the alarms in the suite and the main dwelling must be interconnected with each other, wired or wireless. CO alarms in a suited house must be interconnected throughout, common spaces included. The idea is simple: a fire in the suite has to wake the family upstairs and the reverse.
Secondary suites in Edmonton also require a building permit and an electrical permit pulled by a master electrician, because the homeowner permit path is not available for rental property. If you are planning a suite, alarms are one line item in a longer electrical scope; our residential electricians can walk you through the rest.
The 10-year rule, and monthly habits
Edmonton Fire Rescue recommends replacing all smoke alarms, electrical and battery-operated, every 10 years. The sensor degrades whether or not the test button still beeps. Look for a manufacture date on the back; if there is none, the alarm is older than you think and should go. CO alarms have their own end-of-life dates, often shorter.
Between replacements:
- Test every alarm monthly using the test button.
- Replace batteries at least once a year, including the backup batteries in hardwired units, unless the alarm has a sealed 10-year battery.
- Vacuum the vents every six months. Dust is the usual cause of false alarms.
- Never paint over an alarm or pull the battery to stop a nuisance trip without putting a fresh one in the same day.
Testing and battery changes are on our fall electrical checklist for a reason: the furnace runs hardest in the months when the windows stay closed.
When to call an electrician
Testing, battery swaps and vacuuming are homeowner jobs. Call a licensed electrician when:
- You want hardwired, interconnected alarms where you currently have battery units. That is new wiring and it needs a permit and inspection in Edmonton.
- A hardwired alarm chirps with a fresh battery, or the whole set goes off with no smoke. Interconnected alarms fail as a group, and one bad unit or a loose interconnect wire can trigger all of them.
- You are finishing a basement, adding a suite, or doing any permitted renovation. Alarm layout is checked at final inspection.
- An alarm has been painted over, is missing from a required location, or hangs from its wires.
- You are not sure what you have. We can map the alarms, check interconnection and tell you what the current code would call for.
MNR Electric has installed and replaced alarms in Edmonton homes since 2005. Book through the service request form, or call 780.466.9106. If an alarm is sounding and you smell gas or suspect CO, leave the house first and call 911; call us after.
Quick answers
Where are smoke alarms required in Alberta homes?
On every storey including the basement, in every bedroom, and in the hallway serving the bedrooms, all interconnected and hardwired with battery backup under the National Building Code 2023 Alberta Edition.
Do smoke alarms have to be hardwired in Alberta?
For new construction and permitted renovations, yes: alarms must be hardwired with battery backup and interconnected. Wireless interconnection is allowed if the units still have hardwired power and meet CAN/ULC-S531.
Where should a carbon monoxide alarm go?
Inside each bedroom or in the hallway within 5 metres of the bedroom doors. Health Canada recommends at least one CO alarm with battery backup in any home with a fuel-burning appliance, with the hallway outside sleeping areas the priority.
How often should smoke alarms be replaced?
Every 10 years, whether they are hardwired or battery-powered, according to Edmonton Fire Rescue. CO alarms have their own end-of-life date printed on the unit.
Do I need an electrician to install smoke alarms?
Battery alarms you can mount yourself. Hardwired or interconnected alarms involve new wiring, which requires an electrical permit in Edmonton and a licensed electrician unless you qualify for a homeowner permit.
