The fence or wall
| Rule | Mesa figure |
|---|---|
| Height | 5 ft minimum, measured on the outside |
| Gap at the bottom | 2 in over grass or gravel; 4 in over concrete |
| Openings | No 4-inch sphere passes through |
| Vertical bars, chain-link and diagonal-member openings | 1¾ in maximum |
| Chain link | No lighter than 11 gauge |
| Horizontal rails less than 45 in apart | Rails on the pool side |
| Distance from climbable things (AC units, planters) | 36 in |
| Distance from water's edge | 20 in minimum on the pool side |
| Mesh fences | Bottom no more than 1 in above the deck; cannot lift more than 4 in; nonconductive deck sleeves |
Solid walls cannot have hand- or foot-holds. The 36-inch rule catches block walls with the pool equipment or a bench beside them on the outside.
Gates
Open outward away from the pool; self-closing and self-latching; able to take a lock; gates not used by people stay locked. A latch under 54 inches goes on the pool side, at least 3 inches below the top, with no opening over ½ inch within 18 inches of it. On a double gate, at least one leaf must self-close.
The house as one side of the barrier
| Opening to the pool | Mesa options |
|---|---|
| Door | Self-closing, self-latching, swings away from the pool, latch 54 in above the floor; or a door alarm with its off switch 54 in above the threshold |
| Sliding door | Permanent fastening that needs a tool to remove |
| Window | Latch 54 in up; or an alarm if the sill is under 48 in; or a screwed-in screen or keyed lock if it is not an emergency escape |
| Garage service door | Self-closing, self-latching, latch 54 in up |
| Pet door | Not allowed |
Alarms must be UL 2017 listed as a water hazard entrance alarm, sound within 7 seconds and for 30 seconds, be heard through the house, reset on their own, and pause for no more than 15 seconds with no on/off switch. A motorized safety cover with an ASTM F1346 key switch 54 inches up is also listed.
Where the pool can go
The water's edge must be at least 4 ft from property lines. No pool in the required front yard, a required landscaped area or a public utility easement. Outlets at least 6 ft from the water with GFCI; overhead wires at least 22.5 ft above the water; windows within 5 ft of the water tempered and labeled. Pool water drains to irrigation or the sewer cleanout, never the street. The brochure cites the 2018 International Swimming Pool and Spa Code and the 2017 National Electrical Code, both with Mesa amendments.
What it means for hiring a pool builder
- Get the barrier in the contract. Who builds or modifies the fence, who installs door alarms or self-closers, and who pays if the final fails on a gap or a latch.
- Walk the 36-inch zone. Equipment pads, AC units and planters outside the barrier have to be 36 inches away. Moving an AC unit is an HVAC job; find out before the dig.
- Check the license. Pool contractors in Arizona are licensed by the Registrar of Contractors; see Mesa contractor license lookup.
Questions go to Mesa's Development Information Specialists, 480-644-4273, Monday to Thursday 7:00 am to 6:00 pm (closed Fridays).
Compare Mesa pool builders by permit record →
What Mesa permits show
| Measure | Swimming pool & spa |
|---|---|
| Permits, October 2023 to September 2026 | 452 |
| Firms | 80 |
| Usual filed value | $45,000 |
| Middle half of builders' usual job (33 firms) | $40,148 to $66,529 |
| Usual days, issue to final | 87 |
| Share held by the five busiest firms | 50.4% |
| Firms with a single permit | 48.8% |
| Busiest / quietest month | March / June |
Dolphin Pools filed the most in the last 12 months (19), and five builders held 50.4% of all pool permits. Permits peak in March (index 125) and bottom out in June (index 66): a pool started in spring is usually ready by summer, and the usual permit took 87 days from issue to final.
Five-minute check
- Measure your existing fence and the gap under it, and count the doors that open to the yard.
- Ask the builder for two past Mesa pool addresses and look them up as in Mesa building permit search.
- Compare builders on our Mesa pool list; prices are on Mesa pool cost and counts on Mesa permit statistics.
The general question: do I need a permit for a pool.
What this does not tell you
The City's brochure is informational and says so; the adopted code governs. Our data cannot show which pools failed a barrier inspection, and Mesa pool permits in our file have no finished share.
How we know this
The barrier, gate, door, alarm and siting rules are from the City of Mesa Development Services brochure Swimming Pools & Spas Barrier Requirements (rev. 06/2022), read 23 October 2026. Permit counts are City of Mesa permits on homes in our swimming pool and spa category, October 2023 to September 2026.
Numbers come from City of Mesa residential building permits, data through October 16, 2026. Nobody paid to be on this page and nobody can.
Questions
- How tall does a pool fence have to be in Mesa, AZ?
At least 5 feet, measured from grade on the outside of the barrier. The gap under it can be up to 2 inches over grass or gravel and up to 4 inches over concrete, and no opening may let a 4-inch sphere through.
- Can my house wall be the pool barrier in Mesa?
Yes, if every door and window with direct access to the pool is protected. Doors need either a self-closing, self-latching door with the latch at least 54 inches up, or a UL 2017 listed alarm; sliding doors need a permanent fastening that takes a tool to remove. Pet doors are not allowed.
- Does a hot tub need a fence in Mesa?
Spas and hot tubs must meet the barrier rules, but Mesa allows a latchable or lockable hard safety cover instead. The rules apply to pools, spas, hot tubs and fountains 18 inches deep or more.
- How close to the property line can a pool be in Mesa?
The water's edge must be at least 4 feet from property lines, and a pool cannot go in the required front yard, a required landscaped area or a public utility easement.
- How much does a pool cost in Mesa?
The usual Mesa swimming pool and spa permit was filed at $45,000, and the middle half of builders usually file between $40,148 and $66,529 (452 permits, October 2023 to September 2026). Ask whether the fence and door alarms are in that price.
Build your own list
Every firm with that kind of permit on record. Pick what you value. The list moves.
Related guides
- Do I need a pool permit in Austin? The 24-inch rule, the six inspections and the barrier checklist
- Do I need a pool permit in Cape Coral? Who can apply, the $307 fee, the inspections and the barrier rules
- Do I need a permit for a pool? Yes for in-ground: the rule in 13 cities, and how long they take
- Do I need a pool permit in Miami? Yes: the building permit, the state safety-feature rule, owner-builders and fees
- Setting a manufactured home or park model in Mesa: the City permit, the separate state permit, and who does the work
- Do I need a pool permit in Nashville? Yes: Metro's zoning review, the setbacks, the pool alarm receipt and self-permits