Concerning 3D-printed building construction.

HB 1029 requires Washington’s building code council to update the state residential code to include 3D-printed building construction standards in two phases. First, by the 2024 code update cycle, the council must adopt the 2024 International Residential Code appendix for 3D printing in the code’s appendix. Second, by the 2027 update cycle, it must move these standards into the main body of the residential code, not just an appendix. This bill directly affects builders, developers, and homeowners using 3D-printed construction methods in Washington state by establishing standardized safety and technical requirements.