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Jurisdiction directory

Washington home project permits by county

Many Washington households live outside city limits, where the county building department — not a city — issues the permit. 12 Washington counties, covering the state's largest jurisdictions, are inventoried here.

Model reviewed August 2026

Counties covered

12

largest jurisdictions first

Municipalities tracked

15

in Washington

Population covered

6.6M

residents in listed counties

Code basis

Statewide

Washington State Residential Code, based on the IRC, plus the State Energy Code

Featured counties

The largest and most active permit jurisdictions in the state.

King County2,266,789 residents · seat SeattlePierce County927,380 residents · seat TacomaSnohomish County833,534 residents · seat EverettSpokane County549,690 residents · seat SpokaneClark County516,779 residents · seat VancouverThurston County302,150 residents · seat OlympiaKitsap County279,514 residents · seat Port OrchardYakima County256,728 residents · seat YakimaWhatcom County230,677 residents · seat BellinghamBenton County209,000 residents · seat ProsserSkagit County131,179 residents · seat Mount VernonCowlitz County111,094 residents · seat Kelso

All Washington counties we cover

12 counties, largest first.

King CountySeat: Seattle · 2,266,789 residentsPierce CountySeat: Tacoma · 927,380 residentsSnohomish CountySeat: Everett · 833,534 residentsSpokane CountySeat: Spokane · 549,690 residentsClark CountySeat: Vancouver · 516,779 residentsThurston CountySeat: Olympia · 302,150 residentsKitsap CountySeat: Port Orchard · 279,514 residentsYakima CountySeat: Yakima · 256,728 residentsWhatcom CountySeat: Bellingham · 230,677 residentsBenton CountySeat: Prosser · 209,000 residentsSkagit CountySeat: Mount Vernon · 131,179 residentsCowlitz CountySeat: Kelso · 111,094 residents

Sources

Sources & verification

Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.