The Ontario Building Code | Rooms and Spaces Requiring Heat Detectors or Smoke Detectors
(2) Except as provided in Sentence (3), if a fire alarm system is required in a building, fire detectors shall be installed in the following spaces:
(a) storage rooms not within dwelling units,
(b) service roomsnot within dwelling units,
(c) janitors’ rooms,
(d) rooms in which hazardous substances are to be used or stored,
(e) elevator hoistways, chutes and dumbwaiter shafts, and
(f) laundry rooms in buildings of residential occupancy, except those within dwelling units.
(3) Except as required in Sentence (4), heat detectors and smoke detectors described in Sentence (2), are not required in dwelling units or in sprinklered buildings in which the sprinkler system is electrically supervised and equipped with a water flow alarm.
(4) Where a fire alarm system is required in a hotel, heat detectors shall be installed in every room in a suite and in every room not located in a suite in a floor areacontaining a hotel, other than washrooms within a suite, saunas, refrigerated areas and swimming pools.