King County, WA Swimming Pools & Spas: Pool Permits (2026)

Installing a swimming pool on a property in unincorporated King County requires multiple permits through the Department of Local Services Permitting Division. A building permit is required under KCC 16.04 for any pool with a water depth greater than 24 inches, whether in-ground, above-ground, or on-ground. Associated plumbing and electrical permits are required for pool circulation, heaters, and lighting. The pool must meet setback requirements from property lines, septic systems, wells, and easements as set in KCC Title 21A. A barrier is mandatory per the Washington State Building Code and the International Swimming Pool and Spa Code — typically a fence at least 48 inches high surrounding the pool or yard, with self-closing and self-latching gates latching at least 54 inches above grade on the pool side, and no openings that allow a 4-inch sphere to pass through. Pools in residential areas cannot be used as substitutes for required yard area or setbacks. Electrical bonding and grounding per the National Electrical Code (NEC Article 680) is required and inspected. Drain covers must meet federal Virginia Graeme Baker Pool and Spa Safety Act (VGB Act) anti-entrapment standards. Inspections are required at foundation, plumbing, electrical, and final stages. Public pools and spas (such as rentals at a resort or HOA) additionally fall under WAC 246-260 and are regulated by Public Health Seattle and King County, but single-family residential pools are regulated by the Department of Local Services.