ADU Rules: Kailua vs Mililani Mauka
How do adu rules rules compare between Kailua, HI and Mililani Mauka, HI?
Kailua has fewer restrictions than Mililani Mauka.
Kailua, HI
Honolulu County
Kailua homeowners may add one ADU per zoning lot in eligible residential districts, subject to city-wide density, parking, occupancy, and rental-duration restrictions set by the Honolulu Land Use Ordinance.
View full Kailua rules →Mililani Mauka, HI
Honolulu County
Mililani Mauka homeowners may build one ADU per zoning lot under ROH Sec. 21-5.720 if city rules and the Mililani Mauka Community Association covenants allow, with parking and 30-day rental minimums required.
View full Mililani Mauka rules →Key Facts Comparison
| Fact | Kailua | Mililani Mauka |
|---|---|---|
| - | - |
Highlighted rows indicate differences between cities.
Kailua FAQ
Can I rent my Kailua ADU on Airbnb?
No. ADUs require a minimum 30-day rental term and cannot operate as short-term vacation rentals, which are separately regulated and heavily restricted on the windward side.
How many ADUs can I build on my Kailua lot?
Only one ADU is allowed per zoning lot, regardless of lot size, under ROH Sec. 21-5.720.
Do I need a permit for an ADU in Kailua?
Yes, a building permit and compliance with ADU zoning standards are required. Unpermitted ADUs built before September 14, 2015 may qualify for after-the-fact permitting.
Mililani Mauka FAQ
Does the Mililani Mauka HOA allow ADUs?
Check the Mililani Mauka Community Association design guidelines; approval is required before any city permit can legally be used on a covenanted lot.
Can I rent my ADU short-term?
No. Rentals under 30 days are prohibited in ADUs under city rules.
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