Do I need a smoke detector in every room of an Ottawa suite?

No, you don't need a smoke detector in every single room, but Ontario's requirements are more specific than many homeowners realize — and getting this right is critical for both safety and legal compliance.

The Ontario Building Code (OBC) and Ontario Fire Code set out clear requirements for smoke alarm placement. For a secondary suite or any residential dwelling in Ottawa, you need a smoke alarm on every storey of the unit, including the basement, and outside every sleeping area. So if your suite has bedrooms on one level, there must be a smoke alarm in the hallway or common area directly outside those bedroom doors. If the unit spans multiple floors, each floor needs one.

Inside individual bedrooms is also now required under updated Ontario Fire Code regulations — smoke alarms must be installed inside each bedroom, not just outside them. This change came into effect to give occupants the earliest possible warning, especially since closed doors can significantly delay detection. So while you don't need one in the kitchen, bathroom, or living room specifically, the bedroom requirement often means you'll have more detectors than you might expect.

For secondary suites specifically, Ottawa adds another layer of complexity. Because a secondary suite shares a structure with the primary dwelling, both units must have interconnected smoke alarms — meaning when one alarm triggers, all alarms in both units sound simultaneously. This is a firm OBC requirement for legal secondary suites and is verified during the building inspection process. Interconnection can be done with hardwired alarms or, in some retrofit situations, with approved wireless interconnect systems.

Carbon monoxide detectors are also mandatory in Ottawa under Ontario law if the suite has any fuel-burning appliances (furnace, gas stove, fireplace) or an attached garage. These are often combined smoke/CO units, which simplifies installation.

From a permit and inspection standpoint, the City of Ottawa will verify alarm placement as part of the secondary suite approval process. Cutting corners here isn't just a code violation — it's a serious liability issue for landlords. Improperly placed or missing alarms can void your home insurance and expose you to significant legal risk if there's ever an incident.

If you're converting a basement or adding a secondary suite, this is one area where getting it done right from the start is far easier than retrofitting later. For a free consultation on your secondary suite project — including fire safety compliance — reach out to Justyn Rook Contracting. We handle the full scope, including coordinating all required inspections with the City of Ottawa.