Pool Permit in King County, Washington

Permit required?

Sometimes, depending on the project.

Typical threshold: prefabricated above-ground pools less than 24 inches deep and not exceeding 5000 gallons are exempt; all other pools require a building permit in unincorporated King County.

When a permit is usually needed

Before constructing any pool except small exempt above-ground units in unincorporated King County

Permit cost and what affects it

Most permit fees increased approximately 14% on January 1 2026 plus a $126 application screening fee

Permit costs generally depend on the project valuation, the scope of work, and the inspections required. Ask the office how the fee is calculated for your specific project.

Where to apply

• Official permit page
• Permit portal

Frequently asked questions

Do you need a pool permit in King County?

In unincorporated King County a building permit is required for most swimming pool installations. Prefabricated above-ground pools less than 24 inches deep and not exceeding 5,000 gallons are exempt from the permit requirement. All in-ground pools and larger above-ground pools require a building permit through MyBuildingPermit.com. These rules apply to unincorporated King County only. The typical threshold is prefabricated above-ground pools less than 24 inches deep and not exceeding 5000 gallons are exempt; all other pools require a building permit in unincorporated King County. Always confirm with the office before starting.

How much does a pool permit cost in King County?

Most permit fees increased approximately 14% on January 1 2026 plus a $126 application screening fee Contact the office for current amounts.

How long does a pool permit take in King County?

Processing time for a pool permit in King County varies by workload and project scope. Contact the King County Department of Local Services Permitting Division for a current estimate.

Where do you apply for a pool permit in King County?

You can apply through the King County permit portal or contact the King County Department of Local Services Permitting Division directly. The links are listed on this page.

Official sources

• https://kingcounty.gov/en/dept/local-services/certificates-permits-licenses/permits/permits-inspections-codes-buildings-land-use/do-you-need-a-permit
• https://kingcounty.gov/en/dept/local-services/certificates-permits-licenses/permits