Swimming Pools & Spas in King County, WA (2026)

5 county-level rules, plus city-specific rules for 8 cities in King County, Washington.

Verified from official government sources

Note: These county rules apply to unincorporated areas of King County. If you live within an incorporated city, that city's own rules apply — see the city list below.

Pool Permits

Any pool deeper than 24 inches in unincorporated King County requires a building permit under KCC 16.04, plus plumbing and electrical permits, a barrier inspection, and compliance with WA Building Code and ISPSC.

King County Swimming Pool Permit Rules

Heavy Restrictions

Full ordinance details →Official source ↗

Fencing Requirements

Unincorporated King County requires private swimming pools to be enclosed by a barrier at least five feet high under K.C.C. 16.70.020, with self-closing/self-latching gates and openings that will not pass a 4-inch sphere. Pools must also sit outside the front yard and at least 5 feet from any exterior property line per K.C.C. 16.70.010. State barrier design standards in WAC 246-260 and the IRC Appendix G provisions adopted through WAC 51-51 layer on additional gate, mesh, and ladder-effect rules.

King County Pool Fencing & Barrier Requirements

Some Restrictions

Full ordinance details →Official source ↗

Safety Rules

Pool safety in King County follows the Washington State Building Code (IRC Appendix G). Barriers at least 48 inches with self-closing, self-latching gates are required. Public pools follow WAC 246-260.

King County Pool Safety Rules

Heavy Restrictions

Full ordinance details →Official source ↗

Above-Ground Pools

In unincorporated King County, an above-ground pool that can hold water more than 24 inches deep is regulated as a swimming pool under the Washington State Residential Code Appendix G/AG105 (WAC 51-51). It requires a building permit and a barrier at least 48 inches tall. The pool wall can serve as the barrier when it is 48 inches or taller, but ladders must be removable, lockable, or secured.

King County Above-Ground Pool Rules

Some Restrictions

King County Department of Local Services, Permitting Division — Residential Swimming Pools, Hot Tubs and Spas (February 2019), Items P12 and barrier exemption

Building permits are required for most residential pool installations. Prefabricated swimming pools accessory to a single-family residence, that are less than 24-inches deep, do not exceed 5,000 gallons, and are installed entirely above ground, are EXEMPT from permits. An above ground pool over two feet deep, provides the barrier or the barrier is mounted on top of the pool's structure and the ...

Full ordinance details →Official source ↗

Hot Tub Rules

Portable hot tubs in unincorporated King County under 24 inches deep generally skip building permits but need electrical permits and a compliant safety cover or barrier. Permanent spas follow KCC 16.04 pool permit rules.