Pool Permit in Thurston County, Washington
By Mario Bailey Last checked 2026-07-19 · 2 official sources
Verified against official sources Confirmed on official pageIt depends
Quick answer
Swimming pools are exempt from a county permit only if prefabricated, entirely above ground, less than 24 inches deep, and under 5,000 gallons capacity. All other residential pools require a building permit. The county directs pool applicants to the Residential Building Permit Application.
Typical threshold: Pools are exempt only if prefabricated, entirely above ground, less than 24 inches deep, and under 5,000 gallons capacity.
Who is pulling this permit?
Apply yourself
Hire it out
Before you sign, ask the contractor:
- Who pulls the permit, you or me, and is the permit fee included in the bid?
- Which inspections will this job need, and who meets the inspector on site?
- Is your contractor license active in this locality, and under which business name?
Want a pro to handle this permit? Request free help
Tell us where your project stands. Free to ask; no obligation.
Where we have a vetted local pro who handles permits in Thurston County, we connect you; otherwise we reply with the exact steps and office links for your situation. PermitNotebook is not a government agency and does not file permits. This is a free referral request; we may earn a fee if you hire a pro we introduce. Partners never influence our permit data. Privacy policy.
When a permit is usually needed
In-ground pools, or above-ground pools 24 inches or deeper or over 5,000 gallons
What your pool permit must meet in Washington
Washington's 2021 Residential Code (WAC 51-51, effective statewide March 15, 2024) requires backyard swimming pools, spas, and hot tubs at single-family and duplex homes to be designed and built to the 2021 International Swimming Pool and Spa Code, incorporated by direct statewide reference rather than left to local option.
- The design and construction of swimming pools, spas, and other aquatic recreation facilities must comply with the 2021 International Swimming Pool and Spa Code whenever the facility falls into one of three defined residential categories (WAC 51-51-0327).
- That mandatory ISPSC standard covers pools for the sole use of a single-family dwelling's residents and guests, the sole use of a resident-owned duplex, or a facility used exclusively for medical physical therapy under a licensed practitioner's supervision (WAC 51-51-0327).
- Any other water recreation facility outside those residential categories is regulated under separate Washington Department of Health rules, not the Residential Code (WAC 246-260; WAC 51-50-3109).
Based on 2021 International Swimming Pool and Spa Code (ISPSC), incorporated by WAC 51-51-0327 into the 2021 Washington State Residential Code. Read the code. Local amendments can be stricter; confirm the current requirement with your office before you build.
What pool permit costs in Thurston County
Building permit and plan review fees are valuation based; see the county 2026 Residential Building Fee Guide.
How Thurston County compares in Washington
| Jurisdiction | Permit needed? | Threshold |
|---|---|---|
| Bellevue | It depends | swimming pools over 24 inches deep require a permit with plan review; above-ground pools 24 inches or less may be exempt |
| Clark County | It depends | A permit is required for any structure intended for swimming or recreational bathing that contains water over 24 inches deep, including in-ground, aboveground and on-ground pools, hot tubs and spas. |
| King County | It depends | 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 |
| Pierce County | It depends | Prefabricated swimming pools accessory to a single family residence (Group R-3 occupancy) are exempt if less than 24 inches deep, with no separate gallon volume cap; in-ground pools and pools 24 inches deep or deeper require a building permit. Self-contained spas and hot tubs installed entirely above ground and not connected to the potable water system or a septic or sewer drain are separately exempt regardless of depth. |
| Snohomish County | It depends | prefabricated swimming pools regulated under the IRC (one- and two-family dwellings) exempt if less than 24 inches deep, with no gallon-volume cap; in-ground pools or pools 24 inches deep or more require a building permit |
| Tacoma | It depends | prefabricated above-ground pools less than 24 inches deep and not greater than 5000 gallons are exempt; all other pools require a building permit |
| Thurston Countythis page | It depends | Pools are exempt only if prefabricated, entirely above ground, less than 24 inches deep, and under 5,000 gallons capacity. |
Closest pool permit thresholds outside Washington
Jurisdictions we cover whose limit sits nearest Thurston County's 24 inches.
- Lee County, Florida, All in-ground pool construction or renovation requires a permit; an above-ground pool requires a permit when its water depth is 24 inches or more.
- Palm Beach County, Florida, Portable or manufactured pools and spas less than 24 inches deep need no permit; all in-ground pools, larger above-ground pools, and spas require a Building Permit (Type 3(E) for 1 and 2 unit dwellings) plus applicable electrical, plumbing, and pool-barrier sub-permits, and must satisfy Florida's residential pool safety-feature requirements under F.S. 515.27 before final inspection.
- Polk County, Florida, In-ground pools and spas always require a permit; above-ground pools and spas require one only when more than 24 inches deep.
- Virginia Beach, Virginia, Permits are required for pools, hot tubs, and spas holding 24 inches or more of water; state code exempts only pools with a surface area of 150 square feet or less that are under 24 inches deep.
How to apply in Thurston County
A residential pool permit application covers both construction and safety: a scaled site plan, structural plans for the pool, a barrier plan showing how the pool will be enclosed, and an electrical plan covering bonding and the equipment disconnect.
What most pool permit applications include:
- Pool and spa design and construction fall under the residential code chapter that folds in the swimming pool and spa code, and permit review checks plans against that chapter (IRC R326).
- The site plan must show pool equipment such as pumps, filters, and heaters set back at least 36 inches from the outside of the required barrier (ISPSC 305.2.9).
- For an in-ground pool, engineered structural plans covering the shell and reinforcing steel, with the responsible structural engineer's license information, are a standard part of the submittal (per official pool submittal checklists).
- A barrier plan identifying the fence, pool structure, or dwelling wall that will enclose the pool must be submitted and must comply with the code's barrier chapter (ISPSC 305).
- Electrical plans must show the pool's equipotential bonding design, since the shell, perimeter surfaces, and metal fittings within 5 feet of the water must all tie into a common bonding grid (NEC 680.26).
- The electrical plan must also show a disconnecting means for the pool equipment that is readily accessible and within sight of the equipment (NEC 680.13).
General submittal guidance from 2021 IRC R326 (adopting the ISPSC), ISPSC 2021 Section 305, and NEC 2020 Article 680. Source. Community Planning and Economic Development - Building Development Center sets the exact checklist for Thurston County.
Where to apply in Thurston County:
Community Planning and Economic Development - Building Development Center
- 3000 Pacific Ave SE, Suite 100, Olympia, WA 98501
- Phone: 360-786-5490
- Email: permit@co.thurston.wa.us
Inspections and closing out your permit
Pool inspections track the concrete pour: the steel and bonding grid are checked before gunite or shotcrete goes in, bonding is checked again before decking is poured, and the permanent barrier and remaining electrical work are checked at final before the pool can be filled and used.
- Before gunite or shotcrete is sprayed, the inspector checks the rebar against the engineered plans and confirms the equipotential bonding wire is stubbed out and tied into the steel, since it will be buried in concrete afterward (NEC 680.26).
- A bonding inspection separately confirms coping, decking, ladders, handrail cups, and any other metal within 5 feet of the water are tied to the bonding grid, and it must pass before coping is installed (NEC 680.26).
- A temporary barrier at least 4 feet high must enclose the site from the moment excavation starts until the permanent barrier is finished, and inspectors check for it throughout construction (ISPSC 305.1.1).
- A pre-plaster inspection confirms the circulation equipment's electrical work is installed and all bonding is complete before the pool's interior finish goes on (NEC 680.26).
- At final inspection the permanent barrier is checked against the code's requirements and the equipment and cover-mechanism bonding must be complete before the pool can be filled and used (ISPSC 305, NEC 680.26).
Schedule each inspection in advance and pass the final before you use the work or close the permit. Request inspections through the Thurston County permit portal or by phone at 360-786-5490.
Inspection sequence from NEC 2020 Article 680.26 (equipotential bonding) and ISPSC 2021 Section 305 (barriers). Source. An open permit left un-inspected can surface later in a title search or home sale.
Your Pool Permit checklist for Thurston County
- Confirm the requirement. Sometimes, depending on the project. Typical threshold: Pools are exempt only if prefabricated, entirely above ground, less than 24 inches deep, and under 5,000 gallons capacity. Usually needed: In-ground pools, or above-ground pools 24 inches or deeper or over 5,000 gallons.
- Budget the fee. Building permit and plan review fees are valuation based; see the county 2026 Residential Building Fee Guide. Official fee schedule.
- Apply. A residential pool permit application covers both construction and safety: a scaled site plan, structural plans for the pool, a barrier plan showing how the pool will be enclosed, and an electrical plan covering bonding and the equipment disconnect. Start at the Thurston County permit portal.
- Keep the office details handy. Community Planning and Economic Development - Building Development Center. Phone: 360-786-5490. Address: 3000 Pacific Ave SE, Suite 100, Olympia, WA 98501.
- Plan for inspections. Pool inspections track the concrete pour: the steel and bonding grid are checked before gunite or shotcrete goes in, bonding is checked again before decking is poured, and the permanent barrier and remaining electrical work are checked at final before the pool can be filled and used.
Compiled from the official sources on this page. Last checked 2026-07-19.
The checklist stays on this page either way. We may send occasional verified rule-change notes for your area; unsubscribe anytime. See our privacy policy.
Frequently asked questions
- Do you need a pool permit in Thurston County?
- Swimming pools are exempt from a county permit only if prefabricated, entirely above ground, less than 24 inches deep, and under 5,000 gallons capacity. All other residential pools require a building permit. The county directs pool applicants to the Residential Building Permit Application. Pools are exempt only if prefabricated, entirely above ground, less than 24 inches deep, and under 5,000 gallons capacity. Always confirm with the office before starting.
- How much does a pool permit cost in Thurston County?
- Building permit and plan review fees are valuation based; see the county 2026 Residential Building Fee Guide. See the official fee schedule for current amounts.
- Where do you apply for a pool permit in Thurston County?
- You can apply through the Thurston County permit portal or contact the Community Planning and Economic Development - Building Development Center directly. The links are listed on this page.
From the Library
What else needs a permit in Thurston County
Every other permit type we have verified for this jurisdiction, with the rule that applies here.
| Project | Permit needed? | Threshold | Typical fee |
|---|---|---|---|
| Deck Permit | It depends | Decks are exempt if the surface is 30 inches or less from the ground to the top of the deck. | Building permit and plan review fees are valuation based; |
| Electrical Permit | Permit required | Electrical work in unincorporated Thurston County requires a state electrical permit from L&I; the county itself does not issue electrical permits, with limited work exceptions under WAC 296-46B-901. | L&I sets electrical permit fees; |
| Fence Permit | It depends | Fences 8 feet tall or shorter are exempt from a county building permit. | Building permit and plan review fees are valuation based; |
| HVAC Permit | It depends | Heating and cooling equipment and gas piping require a Minor Permit, but replacement of electric forced-air heating units and water heaters is exempt. | Minor Permit fees apply; |
| Patio Permit | It depends | Patios and porches are exempt if 30 inches or less from the ground to the top of the surface. | Building permit and plan review fees are valuation based; |
| Plumbing Permit | Permit required | No permit is needed only to clear a blockage or to repair or stop a leak in a drain, water, soil, or vent pipe. | Minor Permit fees apply; |
| Roof Replacement Permit | It depends | Roof repair and replacement is exempt unless the work adds skylights or changes, repairs, or replaces structural elements or the roof pitch or slope. | Building permit and plan review fees are valuation based; |
| Shed Permit | It depends | One-story detached accessory buildings with no plumbing or electricity are exempt if under 200 square feet inside a county urban growth area or under 400 square feet outside a UGA. | Building permit and plan review fees are valuation based; |
| Solar Permit | It depends | Residential rooftop solar PV systems need no county permit; ground-mounted and commercial systems require county permits, and every solar project needs a state L&I electrical permit. | Building permit and plan review fees are valuation based; |
Pool Permit in other Washington localities
Official sources
- https://www.thurstoncountywa.gov/departments/community-planning-and-economic-development/permitting/permits-fees-forms/do-you-need-permit
- https://www.thurstoncountywa.gov/departments/community-planning-and-economic-development/permitting/permits-fees-forms/permit-applications-forms
- https://www.bountifulutah.gov/file/ee478521-f791-4cee-a755-2d923ff70257
- https://app.leg.wa.gov/wac/default.aspx?cite=51-51-0327
Verified by a person against the sources above on 2026-07-19, not confirmed with Community Planning and Economic Development - Building Development Center. Rules change; confirm before you build. How we verify.
Last checked: 2026-07-19Report an error on this page
Compare Pool Permit requirements across Washington localities
Permit office
Community Planning and Economic Development - Building Development Center
360-786-5490Permit portalWashington rule changes
- Bellevue, WA sets a flat $290 re-roof permit fee (Ordinance 6879)
Ord. 6879 · 2026-07-25