ADU Rules: Kailua vs Waipahu
How do adu rules rules compare between Kailua, HI and Waipahu, HI?
Kailua and Waipahu have similar restriction levels.
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 →Waipahu, HI
Honolulu County
Waipahu homeowners in this dense former plantation town may build one accessory dwelling unit per zoning lot in eligible residential districts, supporting multi-generational Filipino households under the Honolulu LUO.
View full Waipahu rules →Key Facts Comparison
| Fact | Kailua | Waipahu |
|---|---|---|
| - | - |
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.
Waipahu FAQ
Can I add an ADU for my parents moving to Waipahu?
Yes, if your lot is in an eligible residential district and meets ADU standards. Long-term family occupancy is allowed; short-term rental under 30 days is not.
Is the minimum lot size hard to meet in Waipahu?
Sometimes. Waipahu has many small plantation-era lots. Check your lot's zoning and size with DPP before designing an ADU.
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