What building codes apply in Washington?

Washington has adopted 11 active building codes, including editions of the Washington State Electrical Code, Washington State Mechanical Code, Washington State Energy Code - Residential Provisions. Use the list above to verify the specific year and edition for your project.

No, Washington generally mandates statewide building code adoption, ensuring consistent construction standards across all jurisdictions.

Most states, including Washington, review and adopt new building code editions every 3 to 6 years, typically following the triennial publication cycles of the ICC and NFPA.

Washington's current building code adoption is based on the 2023 edition cycle. Check the code cards above for specific edition years for each code type (IBC, IRC, IFC, etc.).

Washington publishes statewide amendments. The amendment type for each code is indicated by the badge (As Is, State Amended, or State Edition) on each code card above.

Permit requirements in Washington depend on the locally adopted building codes shown above. Contact your local building department for specific permit thresholds and submittal requirements. The code edition in effect on your permit application date determines which requirements apply to your project.