The bill adds a new section to chapter 19.27 RCW directing the State Building Code Council (SBCC) to amend the Washington State Residential Code. Specifically, SBCC must adopt the 2024 International Residential Code appendix BM (addressing 3D-printed building construction) during the adoption cycle for the 2024 Washington State Residential Code, and during the adoption cycle for the 2027 Washington State Residential Code SBCC must amend the main body of the Washington State Residential Code to authorize 3D-printed building construction rather than leaving it in an appendix. This is a procedural change to the state building code framework: it creates a new statutory directive requiring SBCC to incorporate model code provisions on 3D-printed building construction first by adopting the 2024 IRC appendix BM and later by moving that authorization into the primary text of the residential code. It does not create a criminal offense or change penalties; it is a mandate about code adoption and amendment. The affected entity is the State Building Code Council and the subject is the Washington State Residential Code. The bill is identified as H-0210.1, House Bill 1029 (69th Legislature, 2025 Regular Session), prefiled 12/10/24, read first time 01/13/25, and referred to the Committee on Local Government. The bill text excerpt does not define "adoption cycle" or provide procedural timing or detailed steps for adoption, does not include the text or substance of appendix BM, and contains no stated effective date, enforcement mechanism, funding, or implementation details. It is unclear from the provided material whether other sections or documents modify or supplement these directives.

If enacted, Washington would require the State Building Code Council to add the 2024 International Residential Code Appendix BM on 3D‑printed building construction into the state residential code during the 2024 adoption cycle and then, during the 2027 adoption cycle, move authorization for 3D‑printed construction into the main text of the residential code. In practice, that will likely give builders, manufacturers, and local permit officials a clearer basis to permit and inspect 3D‑printed homes and shift 3D‑printing rules from an optional appendix toward full, regular code coverage. The agencies and businesses most affected are the State Building Code Council (which must do the code amendments and bear that work without any funding or implementation details provided), builders and manufacturers of 3D‑printing systems (who may gain reduced regulatory uncertainty but will face whatever technical requirements Appendix BM contains), and local permitting and inspection authorities (who will need to apply and enforce the new provisions). Important details are missing from the text provided—such as the actual content of Appendix BM, precise timing and procedures for the “adoption cycles,” any effective date, and funding or enforcement mechanisms—so some practical impacts and costs remain uncertain.