County Building Permits

King County Building Permit Guide

Building permit information for unincorporated King County and all incorporated cities. Find your jurisdiction's permit authority, application process, fees, and requirements.

Washington Updated March 2026

Important: King County issues building permits only for properties in unincorporated areas of the county. If your property is inside an incorporated city, select your city below — that city's building department handles your permits, not the county.

Unincorporated King County

Permit authority
King County Department of Permitting and Environmental Review (DPER)
Website
County Permits
Phone
206-477-3675
Address
King County Chinook Building, 401 5th Ave, Suite 100, Seattle, WA 98104
Hours
Monday-Friday, 8:00 AM - 4:30 PM

Cities in King County

Select your city for local permit authority, portal links, application steps, fees, and inspection requirements.

Seattle Permit guide → Bellevue Permit guide → Redmond Permit guide → Kirkland Permit guide → Renton Permit guide → Kent Permit guide → Federal Way Permit guide → Auburn Permit guide → Burien Permit guide → SeaTac Permit guide → Shoreline Permit guide → Sammamish Permit guide → Bothell Permit guide → Issaquah Permit guide → Kenmore Permit guide → Mercer Island Permit guide → Newcastle Permit guide → Black Diamond Permit guide → Covington Permit guide →

Information on this page was last verified: March 2026. Permit rules and fees change — confirm current requirements directly with the relevant city or county department before applying.

Related Washington Resources

License Requirements Verify your contractor's WA L&I registration → Contract Template Free homeowner-contractor agreement →

Need help with your project?

Navigating permits in King County can be complicated.

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Important: This page is an educational resource provided by jaspector.com. It is not legal advice, and it does not substitute for official guidance from the permit authorities listed above. Permit requirements, fees, and processes change frequently. Always verify current requirements directly with the issuing department before beginning any construction project. Use of this page does not create an attorney-client relationship. Jaspector assumes no liability for any outcomes arising from reliance on this information.