What's Required in Seattle
- In-ground pools and spas at a house need an SDCI construction permit with a flat fee of 4 times the $292 base fee plus the 5 percent technology fee and $6.50 state surcharge.
- Prefabricated above-ground pools with walls entirely above grade and 5,000 gallons or less are exempt from the building permit but not from electrical, plumbing or barrier rules.
- Pumps, lights, heaters and new circuits need an SDCI electrical permit; owner-occupants may do their own wiring, otherwise a licensed electrical contractor applies.
- Fill, drain, backflow and gas piping need a permit from Public Health Seattle and King County ($137 plus $27 per fixture or outlet in 2026).
- Residential pools must comply with the 2021 ISPSC under SRC R327.1, including a barrier at least 48 in high or a compliant ASTM F1346 safety cover.
- Excavation over 750 sq ft or any work in an environmentally critical area requires a pre-application site visit, and steep-slope lots may need a geotechnical report.
- The construction permit is valid for 18 months and must be renewed if the project runs longer.
- Reinspections cost half the base fee ($146).
Do You Need a Permit for a Pool in Seattle?
For an in-ground pool, yes: a construction permit from SDCI, and unlike most Seattle permits it has a flat fee. Table D-2 of the 2026 Fee Subtitle charges an unenclosed pool accessory to a house (Group R-3) 4 times the $292 base fee, or $1,168, which becomes $1,232.90 with the 5 percent technology fee and the $6.50 state surcharge. For a prefabricated above-ground pool or spa, no building permit is needed if the walls are entirely above the adjacent grade and the capacity is 5,000 gallons or less (SRC R105.2 item 9). Either way the pump and lights need an SDCI electrical permit, and the plumbing needs a permit from Public Health Seattle & King County, which issues all plumbing permits in the city. The Seattle Residential Code sends residential pools to the 2021 International Swimming Pool and Spa Code, whose barrier rule is a 48 in fence.
Seattle Pool Permit Rules by Scenario
| What you are doing | City filing | Rule |
|---|---|---|
| Prefabricated above-ground pool or spa, walls entirely above grade, 5,000 gal or less | No building permit | SRC R105.2 item 9 |
| Same pool with a hard-wired pump, new circuit or heater | SDCI electrical permit (online; from $105.12 plus $55.48 admin) | Seattle Electrical Code 80.50; SRC R105.3 |
| In-ground pool or spa at a single-family home (Group R-3) | Construction permit: base fee x 4 = $1,168 plus 5 percent | Fee Subtitle Table D-2 item 17a |
| Pool built from an SDCI-approved standard plan | Base fee x 1.5 = $438 plus 5 percent | Fee Subtitle Table D-2 item 17f |
| Fill line, drains, backflow assembly, pool heater gas line | King County plumbing or gas permit: $137 plus $27 per fixture or outlet | Public Health fee schedule (2026) |
| Barrier around any outdoor pool or spa | 48 in minimum barrier (ISPSC 305.2.1) or a compliant safety cover | SRC R327.1 adopting the 2021 ISPSC |
| Pool shown on house plans for future construction | Base fee x 1 = $292 plus 5 percent | Fee Subtitle Table D-2 item 17d |
How Much Does a Pool Permit Cost in Seattle?
Building permit: $1,168 + $58.40 technology fee + $6.50 state fee = $1,232.90 for a residential in-ground pool, no matter what the pool costs. Pools at buildings other than houses, and pools that are the principal use of a site, pay 6 times the base fee ($1,752 before fees). A pool inside an enclosed building that is part of the building plans is not charged separately. Electrical permit: SDCI's online (OTC) fee table prices a 30 to 50 amp branch circuit at $43.80 and a 3/4 to 5 HP motor at $32.12, plus the $55.48 administrative fee; that is $131.40, or $137.97 with the technology fee, for a typical pump and light circuit. Plumbing permit: Public Health charges $137 plus $27 per fixture, so a fill line and backflow assembly is about $191. A realistic total for an in-ground pool is around $1,560 in permits. Owners doing their own electrical or plumbing work may take out those permits; otherwise the licensed contractor pulls them.
What Rules Apply to the Pool Itself?
Seattle adopted the 2021 International Residential Code as the Seattle Residential Code, and its Section R327.1 says pools, spas and other aquatic facilities for the sole use of residents and guests at a single-family home shall comply with the 2021 International Swimming Pool and Spa Code. Under ISPSC Section 305 the top of the barrier must be at least 48 in above grade on the side facing away from the pool, with limited clearance beneath it, and spas or pools with a lockable or powered ASTM F1346 safety cover are relieved of the fence requirement. In-ground construction sites must be fenced at least 4 ft high from excavation until the permanent barrier is done. These are model-code figures; SDCI publishes no Seattle pool handout, so confirm details with the plan reviewer. Pool decks follow the ordinary deck rules (permit over 18 in, guards over 30 in), and NR zone lot coverage and setbacks apply.
How the Application Works
Start a Building & Land Use Pre-Application in the Seattle Services Portal with a site plan and legal description. A new in-ground pool is an addition, so expect plan review rather than the quicker STFI track; SDCI targets 2 to 3 weeks for the initial review of simple applications and charges about 75 percent of the fee at intake. Excavation over 750 sq ft or any ground disturbance in an ECA triggers a pre-application site visit, and steep-slope or landslide-prone lots may need a geotechnical report. Once issued, the permit is valid for 18 months, and the electrical service, cover and final inspections are scheduled separately from the building inspections.
How to Get a Pool Permit in Seattle
Decide the pool type
A prefab above-ground pool with walls above grade and 5,000 gallons or less skips the building permit; an in-ground pool needs the flat-fee construction permit plus electrical and plumbing permits.
Check the lot for ECAs and setbacks
Use SDCI's GIS map for steep slopes, landslide and flood-prone areas and the shoreline district, and lay out the pool, equipment and barrier against NR zone setbacks and the 50 percent lot coverage limit.
Submit the pre-application and plans
Start a Building and Land Use Pre-Application in the Seattle Services Portal with a site plan and legal description, then upload the pool plans, barrier details and equipment layout for screening and intake.
Pay the fees and pull the trade permits
Pay the 4 x base fee at intake and issuance; have the electrician and plumber (or yourself as owner-occupant) take out the SDCI electrical permit online and the Public Health plumbing permit.
Inspect before backfill and before filling
Schedule the SDCI building inspections, the electrical cover and final inspections and the Public Health plumbing inspections; keep the construction fence up until the permanent 48 in barrier passes.