The 2018 Seattle construction codes went into effect on March 15, 2021. Unless your project is vested to an earlier code, all new permit applications are required to use the 2018 version of the building, residential, existing building, mechanical, fuel gas, plumbing, elevator, and fire codes and the 2020 versions of the electrical and boiler codes. A summary of key changes can be found on the Project Documents page of SDCI’s 2018 Seattle Code Adoption webpage.
SDCI identified some errors in some of the Seattle construction codes and will be addressing those through an errata ordinance process. During the errata ordinance process, SDCI will be enforcing correct code sections of the Washington Administrative Code (WAC). Currently proposed errata can be reviewed on our 2018 Seattle Code Adoption webpage.
If you have questions regarding the 2018 Seattle construction codes, please contact:
Micah Chappell, Technical Development Codes Manager
Ardel Jala, Building Official