Hawaii County, HI Swimming Pools & Spas: Fencing & Safety Requirements (2026)
Key Facts
- Barrier trigger
- Pool holds water over 24 inches deep
- Minimum barrier height
- 48 inches above grade
- Max gap under barrier
- 2 inches (4 inches on raised pools)
- Max opening size
- No 4-inch sphere may pass through
- Gate requirement
- Self-closing, self-latching, opens away
- Alarm alternative
- House-wall barrier doors need UL 2017 alarm
Summary
Hawai'i County's Residential Building Code adopts IRC Section R326 with local amendments at HCC Section 5B-2-1(36), requiring a barrier at least 48 inches above grade around any pool holding more than 24 inches of water. Gaps under the barrier cannot exceed 2 inches, openings cannot pass a 4-inch sphere, and pedestrian gates must self-close and self-latch.
(36) Section R326, "Swimming Pools, Spas and Hot Tubs" of the International Residential Code, is amended to read as follows: "R326.1 General. Swimming pools shall comply with the requirements of sections R326.2 through R326.4 and other applicable sections of this code. R326.2. Definition. "SWIMMING POOL" shall, for the purposes of this section, have the following meaning: "Any structure intended for swimming, recreational bathing or wading that contains water over 24 inches (610 mm) deep... R326.3.1 Barrier height and clearances. The top of the barrier shall be at least 48 inches (1219 mm) above grade measured on the side of the barrier that faces away from the swimming pool... R326.3.1.7 Gates. Access doors or gates shall comply with the requirements of Sections R326.3.1.1 through R326.3.1.6 and shall be equipped to accommodate a locking device. Pedestrian access gates shall open outward away from the pool and shall be self-closing and have a self-latching device.
Full Breakdown
2 as any structure intended for swimming, recreational bathing or wading that holds water over 24 inches deep, covering in-ground, above-ground and on-ground pools, hot tubs, spas and fixed wading pools. 1 sets the core barrier standard: the top must sit at least 48 inches above grade on the side facing away from the pool, and the gap between grade and the bottom of the barrier cannot exceed 2 inches (4 inches where the barrier sits on top of an above-grade pool structure). 75 inches on closely-spaced horizontal-rail fences.
5 inch. 8 requires doors with direct pool access to carry a UL 2017 alarm that sounds within 7 seconds, unless the pool instead has an ASTM F 1346 power safety cover. 4 separately requires suction outlets to be designed to ANSI/APSP-7 to avoid entrapment hazards.
Violations & Fines
A pool built or resurfaced without a code-compliant barrier is treated the same as any other structure erected without the required construction-code compliance: the county's building inspector can red-tag the pool enclosure at final inspection and withhold or revoke the certificate of occupancy until the barrier, gate self-latching hardware and opening spacing all meet Section R326.3.1's dimensions. A power safety cover meeting ASTM F 1346 is the only substitute the code accepts in place of a physical barrier.
Frequently Asked Questions
Does a safety cover let me skip the fence around my Big Island pool?
How high do the vertical fence pickets need to be spaced on my pool fence?
Can my back door open straight onto the pool deck instead of a fence?
Sources & Official References
Other rules in Hawaii County
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