Swimming pool permit rules in Snohomish County, WA — also covering above-ground pools, in-ground pools, and spa installations — set fencing, barrier, alarm, and inspection requirements.
Most in-ground and larger residential pools in unincorporated Snohomish County need a building permit through the Planning & Development Services department. Small prefabricated above-ground pools that are shallow and low-volume are exempt from a permit but still need code-compliant barriers.
Snohomish County follows the state-adopted building code. A pool that holds more water than the exemption thresholds requires a building permit and inspections. SCC 30.50.103 exempts prefabricated pools that are less than 24 inches deep, hold no more than 5,000 gallons, and are entirely above ground. Even permit-exempt pools must comply with barrier/fencing and electrical safety rules. Apply through Snohomish County Planning & Development Services (PDS); pools inside a city use that city's code, not the county's.
Building without a required permit can trigger stop-work orders, code-enforcement penalties, and mandatory permit-after-the-fact fees under Snohomish County Code Title 30.
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