Washington adopted the International Wildland-Urban Interface Code statewide under RCW 19.27. New construction in designated WUI areas must meet ignition-resistant building, defensible space, and water supply requirements.
Under RCW 19.27.560 and the State Building Code Council rules (WAC 51-55), Washington adopted the International Wildland-Urban Interface Code (IWUIC). Effective July 2024, new construction and substantial alterations in mapped wildland-urban interface areas must comply with ignition-resistant exterior materials, ember-resistant vents, defensible space requirements, and adequate water supply for fire suppression. The Department of Natural Resources publishes WUI maps under RCW 76.04. Local jurisdictions enforce the code but cannot weaken state minimum requirements.
Building code violations may result in stop work orders, civil penalties, denial of certificates of occupancy, and removal of non-compliant construction.
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Silverdale, WA
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Kitsap County, WA
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