Structure Height Limits: Mililani Mauka vs Waipahu
How do structure height limits rules compare between Mililani Mauka, HI and Waipahu, HI?
Mililani Mauka and Waipahu have similar restriction levels.
Mililani Mauka, HI
Honolulu County
ROH Sec. 21-4.60 sets maximum structure heights for Mililani Mauka, with residential districts typically capping homes at 25 to 30 feet and applying sloped envelope planes.
View full Mililani Mauka rules →Waipahu, HI
Honolulu County
Waipahu structure heights follow ROH 21-4.60 with envelope planes in 21-3.70-1, typically 25 feet in R-5 districts and higher caps in A-1 and A-2 districts near Waipahu Town Center.
View full Waipahu rules →Key Facts Comparison
| Fact | Mililani Mauka | Waipahu |
|---|---|---|
| - | - | |
| R-5 height | - | 25 feet typical |
| A-1 / A-2 | - | Higher caps |
| Code section | - | ROH 21-4.60 |
| District companion | - | ROH 21-3.70-1 |
Highlighted rows indicate differences between cities.
Mililani Mauka FAQ
Can I add a second story to my Mauka home?
Second-story additions are possible but must fit within the 21-4.60 envelope planes and pass MTA design review.
Do decorative parapets count toward height?
Minor rooftop features often qualify for limited exceptions, but the specifics depend on the LUO and permit review.
Waipahu FAQ
How tall can a Waipahu home be?
Most Waipahu R-5 lots cap structure height at 25 feet under ROH 21-4.60 and 21-3.70-1 envelope planes. Apartment districts near Waipahu Town allow substantially taller buildings for multi-family use.
Can I add a third story to a plantation home?
Usually no without a variance. Adding a full third story typically exceeds the 25-foot R-5 envelope plane under ROH 21-4.60 and 21-3.70-1. Partial second-story additions are easier to permit.
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