Washington's Wildland-Urban Interface Code applies to parcels mapped high or very-high wildfire hazard. On those parcels, new construction requires class-1 ignition-resistant roofs, exterior walls, and decks, plus driveway access standards. The rules took statewide effect July 1, 2023 under RCW 19.27.560.
Wildfire hazard 'zones' come from statewide and local wildfire hazard and base-level risk maps authorized by RCW 19.27.560. All counties, cities, and towns must apply the WUI Code to commercial and residential building permits on parcels mapped high or very-high hazard. Class-1 ignition-resistant construction includes a class-A roof assembly, one-hour or noncombustible/ignition-resistant exterior walls, and fire-resistant decks and projections. Driveways are required where the first-story exterior wall is more than 150 feet from a fire apparatus access road. Snohomish County is implementing the code; check the county's WUI/wildfire hazard mapping to see whether a specific parcel falls in a high-hazard zone.
Requirements are enforced at building-permit issuance for high and very-high hazard parcels; permits will not be granted until ignition-resistant construction and access standards are satisfied.
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Snohomish County, WA
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See how Snohomish County's wildfire zones rules stack up against other locations.
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