Washington Pool Fence Requirements at a Glance
Washington State Pool Barrier Law
One state building code covers every Washington city and county. The State Building Code Council writes it under chapter 19.27 of the Revised Code of Washington (RCW), and counties and cities enforce it. For homes, the state residential code (WAC 51-51-0327, Section R327.1) requires pools, spas and hot tubs at a single-family home or an owner-occupied duplex to comply with the 2021 International Swimming Pool and Spa Code (ISPSC). That rule has applied since March 15, 2024; the 2024 codes are scheduled to take effect on May 3, 2027.
What Section 305 of the ISPSC requires
- The barrier stands 48 inches tall or more on its outer face
- Under the barrier, a gap of no more than 2 inches above soil, grass or gravel, or 4 inches above a hard surface like concrete
- A 4-inch ball must not fit through any opening; where horizontal members are closer than 45 inches, openings drop to 1.75 inches and the members face the pool
- Chain-link fabric with openings of 2.25 inches or smaller (1.75 inches when slatted)
- Walk-through gates that swing away from the pool and shut and latch without help, with any outside-reachable latch at 54 inches or higher, or a pool-side latch set 3 inches or more below the top and no gaps wider than 1/2 inch within 18 inches of it
The 60-inch latch rule is for public pools. You may read that Washington requires a latch at least 60 inches up, or an 18-inch radius of solid material around a lower latch. That rule comes from the Department of Health's water recreation facility rules (WAC 246-260-031), which cover public and shared pools, not a pool at a single-family home. Home pools follow the ISPSC latch rule above.
When the house is part of the barrier. If a door or low window in the house leads straight to the pool, Section 305.4 calls for one of three protections: listed alarms on those doors and windows, an ASTM International (ASTM) F1346 safety cover on the pool, or another approved method such as doors that close and latch by themselves.
State and local laws change. This information reflects our best research as of September 2026, but you must confirm current requirements with your local building department before installing or modifying any pool barrier. A city or county may amend the state code, but not below it, and changes affecting homes need State Building Code Council approval (RCW 19.27.060).
Last reviewed: September 2026. Report an error →
Official source: WAC 51-51-0327, Washington residential pool rule (2021 ISPSC)
Above-Ground Pools in Washington
Washington treats an above-ground or on-ground pool that holds more than 24 inches of water like any other. Its wall counts as the barrier once it reaches 48 inches on every side and meets the opening limits; a top-mounted barrier can add the missing height.
Steps and ladders have to lock, fold up or come out, leaving no 4-inch gap, unless a barrier of their own surrounds them. A gate in that barrier uses the home-pool latch rule, not the 60-inch rule written for public pools.
Send the pool's wall height and ladder or step design to your city or county permit office and get a yes before you buy.
Local Variations in Washington State
Washington has one state building code, and cities and counties cannot weaken it for homes: any local amendment affecting houses needs State Building Code Council approval (RCW 19.27.060). Your city or county building department issues the permit and inspects the barrier.
| Jurisdiction | Key Notes |
|---|---|
| Seattle | The Seattle Department of Construction and Inspections (SDCI) issues permits and enforces the code. See our Seattle guide. |
| Spokane Valley | The city's residential pool standards restate the 2021 ISPSC barrier rules, including the 54-inch latch. |
| Other cities and counties | Ask your building department for its pool handout and permit checklist. A county or city without its own building department contracts with another for enforcement. |
Always verify requirements with your local building department before purchasing or installing any pool fence.
Pool Fence Cost in Washington State
We found no published source that prices pool fences by state or city, so these are national installed ranges from our pool fence cost guide. Quotes where you live can land above or below them.
| Material | Installed, per linear foot | Full breakdown |
|---|---|---|
| Removable mesh | $15 to $35 | Mesh fence cost |
| Aluminum | $30 to $60 | Aluminum fence cost |
| Vinyl / PVC | $20 to $45 | Vinyl fence cost |
| Tempered glass | $90 to $500 | Glass fence cost |
National typical installed ranges, not quotes. Multiply by your fence perimeter. Some sources include one gate in the figure; extra gates, permits and hard deck surfaces add to the total. Sources: HomeGuide (Feb 3, 2026), Life Saver Pool Fence (Aug 5 and Sep 23, 2026) and Pool Guard USA (May 20, 2025). Full source list and method: pool fence cost guide. Reviewed September 2026.
Washington Pool Fencing: One Code on Both Sides of the Cascades
Washington applies the same pool barrier rule in Seattle, Spokane and every town between: the 2021 ISPSC, adopted through the state residential code. Local building departments enforce it, and they cannot relax it for homes without the State Building Code Council's approval.
The rule people get wrong is the latch. The 60-inch latch and 18-inch solid radius come from the Department of Health's rules for public and shared pools. At a single-family home, the ISPSC's 54-inch rule applies.
The 2024 codes are scheduled for May 3, 2027, so ask which edition applies when you apply for the permit.
Western Washington's wet climate is hard on hardware, so choose powder-coated aluminum or vinyl and check hinges and anchors each year.
Washington State Pool Fence FAQs
Yes, through the state building code rather than a statute. Washington's residential code (WAC 51-51-0327) requires pools at single-family homes to comply with the 2021 International Swimming Pool and Spa Code, which sets a 48-inch barrier for pools deeper than 24 inches; your city or county building department enforces it.
48 inches on the outside of the barrier. No opening may let a 4-inch sphere through, and the gap at the bottom can be no more than 2 inches over grass or gravel.
Not for a home pool. The 60-inch latch, or an 18-inch radius of solid material around a lower latch, is a Department of Health rule for public and shared pools (WAC 246-260-031). At a single-family home, a latch reachable from outside must be at least 54 inches up, or the latch must sit on the pool side at least 3 inches below the top of the gate.
They are, once the pool can hold more than 24 inches of water. A wall at least 48 inches high on every side can act as the barrier, and the ladder or steps must be locked, removed or fenced in.
Only in one situation. If the house wall is part of the barrier and a door or window opens toward the pool, the code asks for alarms on those openings, an ASTM F1346 safety cover, or another approved fix such as self-closing, self-latching doors.
A city or county can amend the state code, but not below the state minimum, and any amendment that affects houses takes effect only if the State Building Code Council approves it (RCW 19.27.060).
We found no published source that prices pool fences by state, so we use national installed ranges per linear foot: removable mesh $15 to $35, aluminum $30 to $60, vinyl $20 to $45 and tempered glass $90 to $500. Multiply by your fence perimeter. Written local bids will vary with labor and site work.
Sources
Every rule on this page traces to one of these. We link the primary source so you can check it yourself.
- WAC 51-51-0327, Section R327 (Washington State Legislature; effective March 15, 2024) (home pools follow the 2021 ISPSC)
- RCW 19.27.060 (Washington State Legislature) (applies to all buildings; local amendments for homes need Council approval)
- Chapter 19.27 RCW, State Building Code (enforced by counties and cities)
- Washington State Building Code Council (2024 codes effective May 3, 2027)
- Washington Swimming Pool and Spa Code 2021 (UpCodes) (the ISPSC as adopted in Washington)
- Department of Health, Pool Barrier Design Guidelines, DOH 333-120 (November 2011) (the 60-inch latch rule for public and shared pools)
- City of Spokane Valley, Residential Pool, Hot Tub or Spa Standards (a local restatement of the ISPSC barrier rules)