Snohomish County, WA Swimming Pools & Spas: Pool Permits (2026)
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.
Key Facts
- Permit fee
- $140 flat fee (SCC 30.86.400(10))
- Exempt residential-code pools
- prefab, under 24 inches deep
- Exempt building-code pools
- prefab, under 24in, under 5,000 gal, above ground
- Unpermitted work penalty
- 100% of permit fee (SCC 30.86.400(9))
- Application filed with
- building official under SCC 30.50.100
- Critical areas / floodplain
- separate permit may still apply
Summary
Unincorporated Snohomish County requires a building permit before installing an in-ground or deep residential swimming pool. SCC 30.50.103(1)(g)-(h) exempts only prefabricated pools less than 24 inches deep, capped at 5,000 gallons and installed entirely above ground; anything bigger or set into the ground needs a permit from the Department of Planning and Development Services.
Permits shall not be required for the exemptions listed in this section. Exemption from permit requirements of these codes shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of the building code, residential code, or any other laws or county ordinances. Work exempt under this provision may still require the applicable permit(s) when located in flood hazard or critical areas and be subject to other requirements in this title. ... (g) Prefabricated swimming pools regulated under the IRC that are less than 24 inches (610 mm) deep. (h) Prefabricated swimming pools regulated under the IBC that are accessory to a Group R-3 occupancy which are: less than 24 inches (610 mm) deep, do not exceed 5,000 gallons (18,925 L), and are installed entirely above ground.
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through legislation passed August 12, 2026).
Full Breakdown
103 lists the work exempt from a building permit, and swimming pools get two narrow carve-outs. Under subsection (1)(g), a prefabricated pool regulated by the residential code is exempt only if it is less than 24 inches deep. Under (1)(h), a prefabricated pool regulated by the building code and accessory to a single-family (Group R-3) home is exempt only if it is less than 24 inches deep, holds no more than 5,000 gallons, and sits entirely above ground. Any pool that is dug into the ground, exceeds 24 inches of water depth, or exceeds 5,000 gallons falls outside these exemptions and needs a full building permit before construction begins.
104 once the submittal meets the adopted construction codes. 400(10), Miscellaneous Review and Permit Fees, lists a flat SWIMMING POOL PERMIT fee of $140. 103 also warns that an exemption from the building permit does not excuse compliance with flood hazard or critical area rules: a pool otherwise exempt as a small above-ground unit can still trigger a separate critical areas or floodplain permit if the property sits in one of those regulated zones. 110.
Violations & Fines
Starting pool construction without the required permit draws an Investigation Penalty under SCC 30.86.400(9) equal to 100 percent of the permit fee, on top of the fee itself, whether or not a permit is later obtained for the work. The building official may also pursue any remedy in chapter 30.85 SCC, including citations, notices and orders, under SCC 30.50.106 to force compliance or removal of unpermitted pool construction.
Frequently Asked Questions
Do I need a permit for an above-ground pool in unincorporated Snohomish County?
How much does a Snohomish County swimming pool permit cost?
What happens if I build an in-ground pool without a permit?
Are prefabricated wading pools always exempt from a permit?
Sources & Official References
Other rules in Snohomish County
Compare Snohomish County to another location·View the Washington swimming pools & spas overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.