Shed / Outbuilding 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
Sheds 120 square feet or less without utilities are exempt in Seattle, WA.
Source: Seattle Building Code / SDCI
When you DO need a permit
Sheds larger than 120 square feet require a building permit in Seattle, WA.
Estimated fee: $120 – $480
Typical timeline: About 3 weeks
Source: Seattle Building Code / SDCI
Sheds with electrical require permits in Seattle, WA.
Estimated fee: $180 – $600
Typical timeline: About 3 weeks
Source: Seattle Building Code / SDCI
Sheds may be subject to zoning setback requirements and lot coverage limits. Placement near property lines or in front yards may require zoning approval.
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Frequently Asked Questions
Estimated permit fees for Shed / Outbuilding 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 Shed / Outbuilding 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 Shed / Outbuilding permits in Seattle is About 3 weeks. More complex projects may take longer if plan review is required.
Learn More About Shed / Outbuilding Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read Shed / Outbuilding Guide →