ADU Rules: Mililani Town vs Urban Honolulu
How do adu rules rules compare between Mililani Town, HI and Urban Honolulu, HI?
Urban Honolulu has fewer restrictions than Mililani Town.
Mililani Town, HI
Honolulu County
Mililani Town homeowners may build one ADU per zoning lot under ROH Sec. 21-5.720, but HOA covenants and association design rules often impose additional restrictions on top of city code.
View full Mililani Town 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 Town | 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 Town FAQ
Does Mililani Town allow ADUs?
City zoning allows one ADU per eligible lot, but the Mililani Town Association and your neighborhood association may restrict or prohibit them. Always check your CC&Rs first.
Can I rent my Mililani ADU short-term?
No. City rules require 30-day minimum rentals under ROH Sec. 21-5.720, and most Mililani HOAs additionally restrict short-term rentals.
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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