Pasco, WA Fire Regulations: Smoke Detectors (2026)

040(6)(d)(i). 040(6)(d)(ii) then offers an alternative path recognized under the Washington State Amendments to the IRC, but only if the applicant's documentation satisfies all three listed criteria. The ADU must be built within an existing dwelling unit with an approved doorway or stairway giving interior access between the primary dwelling and the ADU so the two present as one common dwelling (criterion A); either the ADU or the primary dwelling must be owner-occupied, recorded on title through an owner occupancy agreement (criterion B); and, under criterion C, all required smoke alarms in the accessory dwelling unit and the primary dwelling unit must be interconnected so that the actuation of one alarm activates every alarm in both units.

040(6)(d)(iii) closes the loop: if an ADU using this alternative is later modified so it is no longer owner-occupied, new permits are required to verify the construction, including the interconnected alarm system, still meets the applicable standards. 010 for construction generally.