Maui County, HI Building Safety: Fire Sprinkler Requirements (2026)
Key Facts
- Governing section
- MCC § 16.25.405 (405.2)
- Applies to
- Hale (indigenous Hawaiian structures) only
- No-sprinkler setback
- 100 feet (Class A)
- Design standard
- NFPA 13 or local alternative
- Water supply duration
- 30 minutes minimum
Summary
Maui County has no general residential sprinkler mandate, but its Hawaiian Provisions for Indigenous Hawaiian Architecture require automatic fire sprinklers on a hale (traditional Hawaiian structure) that sits too close to neighboring buildings or property lines. A hale set back at least 100 feet needs no sprinklers at all.
401.1 Scope. The provisions of this chapter shall apply exclusively to Indigenous Hawaiʻian Architecture Structures. ... B The structure (or a group of structures) that conforms to applicable zoning setback requirements but does not satisfy Class A setback requirements. Automatic fire sprinkler system shall be installed in accordance with design standards in section 3805.2. An electrical permit is required for fire sprinklers systems. ... 405.2 Automatic fire sprinklers. The design standards for automatic fire sprinklers for Class B indigenous Hawaiʻian architecture structures shall be in accordance with NFPA 13. ... 1. 18 gallons per minute for a single head at 140 square feet maximum coverage of roof area. ... 5. Sprinkler head spacing shall not exceed 14 feet. ... 7. The total number of sprinklers on a branch shall not exceed 6 heads. ... 12. Water supply shall be sufficient to provide 30 minutes duration.
Full Breakdown
401 states the chapter applies exclusively to Indigenous Hawaiian Architecture Structures, so this sprinkler mandate governs hale, not ordinary single-family homes built under the standard International Residential Code amendments. 1 splits hale into two fire-protection classes by setback. 2, plus an electrical permit for the sprinkler wiring. 2 sets the design standard at NFPA 13, then offers a detailed local alternative: a single sprinkler head must deliver at least 18 gallons per minute covering up to 140 square feet of roof, head spacing cannot exceed 14 feet, a branch line cannot carry more than 6 heads, and the water supply must sustain the system for a full 30 minutes.
3 requires a licensed engineer or C-20 contractor to certify that the water supply can actually deliver the required fire flow for that 30-minute duration before the hale is approved.
Violations & Fines
Because the sprinkler mandate sits inside the building code, failing to install the required Class B sprinkler system before occupying a hale falls under the general building-code violation and stop-work provisions in sections 16.25.113 and 16.25.114, which make unpermitted or noncompliant construction unlawful and let the building official halt work until it is corrected. A hale built without the certified water-supply test required by section 405.3 has not met the code's design standard and would fail its required inspection under section 16.25.110.
Frequently Asked Questions
Does Maui County require fire sprinklers in a new house?
When does a hale need a fire sprinkler system on Maui?
What sprinkler design standard applies to a Maui hale?
Sources & Official References
Other rules in Maui County
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