ADU Rules: Mililani Mauka vs Urban Honolulu
How do adu rules rules compare between Mililani Mauka, HI and Urban Honolulu, HI?
Urban Honolulu has fewer restrictions than Mililani Mauka.
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 →Urban Honolulu, HI
Honolulu County
Most Urban Honolulu lots sit in apartment or mixed-use zones where ADUs under ROH Sec. 21-5.720 are not permitted; ADUs are generally limited to R-5 through R-20 single-family neighborhoods like Manoa, Kaimuki, and Nuuanu.
View full Urban Honolulu rules →Key Facts Comparison
| Fact | Mililani Mauka | Urban Honolulu |
|---|---|---|
| - | - | |
| Code Section | - | ROH Sec. 21-5.720 |
| Urban Eligible Zones | - | R-5, R-7.5, R-10, R-20 |
| Not Eligible | - | A-1, A-2, BMX, B |
| Minimum Rental Term | - | 30 days |
Highlighted rows indicate differences between cities.
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.
Urban Honolulu FAQ
Can I build an ADU on my Kakaako or Ala Moana condo lot?
No. ADUs are not allowed in A-1, A-2, or BMX mixed-use zones common in Kakaako and Ala Moana. ADUs are limited to residential R-5 through R-20 districts.
Can I build an ADU on my Manoa single-family lot?
Yes, if the lot meets R-5 or R-7.5 minimum size, parking, and setback rules under ROH Sec. 21-5.720 and you obtain a building permit.
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