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πŸ—οΈ Accessory Structures/ADU Rules

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

Heavy Restrictions

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 β†’

Urban Honolulu, HI

Honolulu County

Some Restrictions

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 β†’

Key Facts Comparison

FactMililani TownUrban Honolulu
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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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