2018 Seattle Code Adoption - What & Why

What’s Happening Now?

We have adopted the 2018 editions of the Seattle construction codes and have subsequently adopted errata to correct errors in the printing of the Building, Energy, and Boiler and Pressure Vessel Codes. Code changes can come from various sources including the International Code Council, State of Washington, members of the public, and City staff.

The Seattle codes are now available for purchase. See our Project Documents page for information about pricing and ordering instructions.

Project Benefits

Regular updates to Seattle's construction codes make it easier to:

  • Incorporate emerging technology and materials into construction to increase a building's safety, usability, and lifespan
  • Keep Seattle competitive and innovative with early adoption of national code changes
  • Adopt requirements that ensure Seattle's leading-edge energy and carbon reduction goals are met
  • Decrease differences in construction code adoption and enforcement with neighboring communities    

The End Result

Seattle adopted the 2018 editions of the national model codes published by the International Code Council along with State of Washington and local amendments. They became effective on March 15, 2021. Seattle adopted errata that went into effect on July 6, 2021 to correct printing errors. A summary of key changes is posted on the Project Documents page.