Washington Permit & Stamping Requirements
Requirements vary by region, code cycle, seismic zone, and wind or snow load. Here is what typically drives design for Washington projects.
What Drives Design in Washington
Washington projects are governed primarily by seismic lateral demand.
- ✓ Seismic lateral analysis per ASCE 7
- ✓ State energy code compliance report
- ✓ Structural Engineer (SE) seal where required
Exact code edition and local amendments vary by city and county. We confirm the specific requirements for your address before drafting.
Code in effect in Washington
Washington enforces a statewide code set by the State Building Code Council, and every city and county must enforce it. The 2021 editions of the International Codes with Washington amendments took effect on March 15, 2024, replacing the 2018 editions. The next cycle is in rulemaking, with energy code adoption targeted for late 2026.
What to plan for
- ✓ Seismic design governs much of western Washington, and the Washington Energy Code is stricter than the base IECC.
- ✓ Completed submittals filed before a code change date are generally vested in the previous edition.
- ✓ Local jurisdictions enforce the state code but may add their own administrative requirements.
Code information last verified September 2026. Codes change, so we confirm the edition in force for your address before drafting.
Frequently asked questions about Washington permits
Which code edition does Washington use?
The 2021 International Codes with Washington State amendments, in effect since March 15, 2024. The Council is working through the next cycle, so we confirm the edition in force for your submittal date.
Does Washington have a stricter energy code?
Yes. The Washington State Energy Code is written as its own set of provisions and is generally more demanding than the base national model code.
Sample Work & Other States
Foundation Plan
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Roof Framing Plan
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