Implementing the International Wildland Urban Interface Code.

HB 1254 requires Washington State to adopt the International Wildland Urban Interface Code (IWUIC) by November 2029, directly affecting builders, homeowners, and local governments in wildfire-prone areas. The bill mandates specific fire-resistant construction standards, including class A-rated roofs, fire-resistant exterior walls, and ignition-resistant materials for decks and accessory structures. These requirements apply to new construction, major roof replacements, and additions in counties with wildfire hazard maps. The law updates building codes to align with national wildfire safety standards, aiming to reduce fire risk in communities near wildlands.