Deck / Patio Permit Requirements in Seattle, WA
Seattle has its own building code based on IRC/IBC with local amendments. Seismic Design Category D. Energy code stricter than base IECC. Rain/drainage requirements for all new construction.
When you DON'T need a permit
Freestanding decks not exceeding 30 inches above grade are exempt in Seattle, WA.
Source: Seattle Building Code / SDCI
When you DO need a permit
Attached decks require a building permit in Seattle, WA.
Estimated fee: $120 – $480
Typical timeline: About 3 weeks
Source: Seattle Building Code / SDCI
Decks over 30 inches above grade require a building permit in Seattle, WA.
Estimated fee: $180 – $720
Typical timeline: About 4 weeks
Source: Seattle Building Code / SDCI
Covered decks require permits in Seattle, WA. Rain drainage considerations required.
Estimated fee: $300 – $960
Typical timeline: About 4 weeks
Source: Seattle Building Code / SDCI
Decks may be subject to zoning setback and lot coverage requirements. Check with your local planning department before building near property lines.
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Frequently Asked Questions
Estimated permit fees for Deck / Patio projects in Seattle, WA range from $120 – $480. Fees vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller Deck / Patio projects may be exempt from permit requirements, while larger ones typically require a permit. Use our free lookup tool to check your specific situation.
Working without a required permit in Seattle can result in fines, stop-work orders, being required to remove completed work, and complications when selling your home. It's always best to check first.
Typical approval time for Deck / Patio permits in Seattle is About 3 weeks. More complex projects may take longer if plan review is required.
Learn More About Deck / Patio Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read Deck / Patio Guide →