Structure Height Limits: Mililani Town vs Urban Honolulu
How do structure height limits rules compare between Mililani Town, HI and Urban Honolulu, HI?
Mililani Town has fewer restrictions than Urban Honolulu.
Mililani Town, HI
Honolulu County
ROH Sec. 21-4.60 limits Mililani Town residential building heights to roughly 25 feet flat or 30 feet pitched, with HOA guidelines often further restricting visible bulk in this master-planned community.
View full Mililani Town rules →Urban Honolulu, HI
Honolulu County
Urban Honolulu caps residential structures at 25 feet under ROH 21-4.60 with a 30-foot envelope plane, while Waikiki, Kakaako, and Ala Moana high-rise districts follow separate maximum heights.
View full Urban Honolulu rules →Key Facts Comparison
| Fact | Mililani Town | Urban Honolulu |
|---|---|---|
| - | - | |
| Residential cap | - | 25 feet |
| Envelope plane | - | 30 feet |
| Primary section | - | ROH 21-4.60 |
| Kakaako oversight | - | HCDA |
Highlighted rows indicate differences between cities.
Mililani Town FAQ
Can I add a second story to my single-story Mililani home?
Often yes within height limits, but HOA design review may restrict placement, size, or require harmonized architecture.
Are rooftop solar arrays restricted?
Roof-mounted solar generally gets exceptions, but HOA guidelines may dictate panel orientation and visibility from street.
Urban Honolulu FAQ
How tall can I build a house in Urban Honolulu?
Most residential districts cap structures at 25 feet under ROH 21-4.60 with a 30-foot envelope plane rising from side yards. Apartment and mixed-use districts in Waikiki and Kakaako allow much taller buildings.
Why are Waikiki and Kakaako buildings so much taller?
Those districts carry separate height maximums under special district rules and, in Kakaako, Hawaii Community Development Authority oversight. View-corridor protections still limit where high-rises may rise.
Compare other topics
See how Mililani Town and Urban Honolulu compare on other ordinance categories.
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