Building Permits in Seattle
Find permit requirements, fees, and application steps for all common building projects in Seattle, WA. Source-cited from official city building code.
Most home improvement projects in Seattle require a building permit. Select a permit type below to see whether a permit is required, what the fees are, and how to apply through the Seattle Department of Construction and Inspections (SDCI).
Permit Types
Fence Permit
Requirements →
Shed Permit
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Deck Permit
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Pool Permit
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Addition Permit
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ADU Permit
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Demolition Permit
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Electrical Permit
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Plumbing Permit
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Roofing Permit
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HVAC Permit
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Solar Permit
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Seattle Building Department
Seattle Department of Construction and Inspections (SDCI)
Phone: (206) 684-8850
Visit Building Department WebsiteAbout Seattle Building Permits
Building permits ensure that construction work in Seattle meets local safety codes and zoning requirements. Unpermitted work can result in fines, required demolition, and complications when selling your home. Always confirm permit requirements with the Seattle Department of Construction and Inspections (SDCI) before starting any project.
Source: Seattle Municipal Code 23.44.041 — Accessory Dwelling Units; Washington RCW 36.70A.681 (HB 1337 codification). Last verified April 5, 2026. View source