Implementing the International Wildland Urban Interface Code.

SB 6279 requires Washington counties and cities to adopt the International Wildland Urban Interface Code (IWUIC) by November 1, 2029, for wildfire-prone areas identified in state hazard maps. It directly affects builders, property owners, and local governments in high-risk zones by mandating specific construction standards to reduce wildfire risks. Key provisions include requiring class A roof materials (resistant to fire embers), fire-resistant exterior walls using noncombustible or treated materials, and ember-proofing for decks and accessory structures. The bill amends existing building code laws to integrate these wildfire safety measures into state enforcement. This is a substantive policy change focused on fire-resistant construction, not a procedural or commemorative measure.