Issaquah, WA Fire Regulations: Smoke Detectors (2026)

Issaquah adopts the 2021 International Fire Code by reference in IMC 16.06.010 and then amends it section by section. The smoke alarm rule for buildings that already exist is IMC 16.06.175, which replaces IFC Section 1103.8, titled Single- and multiple-station smoke alarms. The city text says that single- and multiple-station smoke alarms shall be installed in existing Group I-1 and R occupancies in accordance with Sections 1103.8.1 through 1103.8.3.

Group R covers residential occupancies such as apartments and other dwellings, and Group I-1 covers institutional residential uses, so the requirement reaches the buildings where people sleep. Section 1103.8.1 states where alarms are required: existing Group I-1 and R occupancies shall be provided with single-station smoke alarms in accordance with Section 907.2.11 10 of the code, and the printed text keeps that cross-reference exactly as the city published it. Interconnection and power sources must follow IFC Sections 1103.8.2 and 1103.8.3, which the city leaves unamended.

There is one exception. Where smoke detectors connected to a fire alarm system have been installed as a substitute for smoke alarms, the separate single-station alarms are not required. A building with a monitored system that already has detectors in place does not have to add a second layer of stand-alone units.

IMC 16.06.010 also settles conflicts: if any provision of the IFC and chapter 16.06 disagree, the chapter 16.06 provision applies. The fire code is enforced by the Fire Code Official, and under IMC 16.06.230 that official and other Fire Department personnel designated by the Fire Code Official and approved by the City Administrator can issue infractions for violations of the International Fire Code. This section covers existing buildings only. The text of IMC 16.06.175 does not set the smoke alarm rule for new construction, which is governed by the building code provisions the city adopts in IMC chapter 16.04.