Concerning performance-based building codes for low-rise residential buildings.

HB 2381 creates a performance-based compliance pathway for low-rise residential buildings (1-6 stories, up to 24 units) in Washington, replacing rigid prescriptive building code requirements. It directs the State Building Code Council to develop a new appendix to the building code, allowing builders to demonstrate compliance through measurable performance standards (like structural safety or energy efficiency) instead of specific construction methods. This system enables reuse of certified designs across jurisdictions, reduces redundant permitting reviews, and aligns with existing energy and emissions programs. The bill directly affects builders, developers, and local building departments by streamlining approvals and supporting industrialized housing production to address the state's housing shortage.