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2021 Seattle Construction Codes Adoption Process

We are now accepting code change proposals as part of the update of the Seattle Construction Codes from the 2018 to the 2021 code editions. Anyone proposing a code change for the building, residential, mechanical, fuel gas, existing building, and plumbing codes is encouraged to do so by January 1, 2023. SDCI and the Construction Codes Advisory Board will review these proposals and any staff-proposed code changes for potential inclusion in the new codes beginning in January 2023.

Seattle’s new codes are tentatively set to be effective July 1, 2023, which aligns with the effective date for the State of Washington’s 2021 construction codes.

Visit our Code Adoption Process website for updates and associated documents.