Carport Rules: Mililani Mauka vs Urban Honolulu
How do carport rules rules compare between Mililani Mauka, HI and Urban Honolulu, HI?
Urban Honolulu has fewer restrictions than Mililani Mauka.
Mililani Mauka, HI
Honolulu County
Carports in Mililani Mauka are limited to 20 ft by 20 ft horizontally under ROH Sec. 21-2.140-1, with setbacks from Sec. 21-4.30 and height from Sec. 21-4.60 also applying.
View full Mililani Mauka rules →Urban Honolulu, HI
Honolulu County
Urban Honolulu carports must comply with the 20-by-20-foot horizontal limit in ROH Sec. 21-2.140-1, with Type V-B hillside carports allowed extra height in mauka neighborhoods like Makiki Heights and Manoa.
View full Urban Honolulu rules →Key Facts Comparison
| Fact | Mililani Mauka | Urban Honolulu |
|---|---|---|
| - | - | |
| Code Section | - | ROH Sec. 21-2.140-1 |
| Max Dimensions | - | 20 ft by 20 ft |
| Hillside Exception | - | Type V-B carports |
| Setback Reference | - | ROH Sec. 21-4.30 |
Highlighted rows indicate differences between cities.
Mililani Mauka FAQ
Can I add a second carport?
Only if total dimensions, setbacks, and HOA standards allow; review both city and MMCA rules first.
Is a carport cover a permit activity?
Yes, any attached structural cover requires a building permit.
Urban Honolulu FAQ
Can my carport be larger than 20 by 20 in Urban Honolulu?
No. ROH Sec. 21-2.140-1 caps carport and detached garage horizontal dimensions at 20 feet by 20 feet, regardless of neighborhood.
I live on a hillside in Makiki Heights. Can I build a two-story carport?
Possibly. Type V-B hillside carports may exceed one story under specified conditions in Sec. 21-2.140-1. Confirm the exact criteria with the Department of Planning and Permitting.
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