Sammamish, WA Fire Regulations: Smoke Detectors (2026)

05 directs that references to the IPMC elsewhere in the code mean this locally adopted code). 280(3)(b), requires smoke alarms 'installed and maintained in Groups R-2, R-3 and R-4 and in dwellings not regulated in Group R occupancies, regardless of occupant load,' at three locations: on the ceiling or wall outside each separate sleeping area near the bedrooms, in each room used for sleeping, and on each story of the dwelling unit including basements and cellars (but not crawl spaces or uninhabitable attics). A split-level exception lets one alarm on the upper level cover the adjacent lower level if there is no intervening door and the lower level is less than a full story down.

served from a commercial source and shall be equipped with a battery backup,' must 'emit a signal when the batteries are low,' with permanent wiring and no disconnect switch beyond normal overcurrent protection. Battery-only alarms are allowed under a listed exception where no construction is under way, there is no commercial power source, or existing finishes are not being removed during a remodel. 280(5) further requires interconnection so that one alarm triggers all alarms in Groups R-2, R-3, R-4 and other dwellings, audible in every bedroom over background noise with doors closed, subject to similar remodel-scope exceptions.