Lot Coverage Limits: Kailua vs Mililani Town
How do lot coverage limits rules compare between Kailua, HI and Mililani Town, HI?
Kailua and Mililani Town have similar restriction levels.
Kailua, HI
Honolulu County
Kailua residential lots follow ROH Sec. 21-3.70-1, which limits impervious surface coverage. Homes permitted after May 1, 2019 are capped at 75 percent impervious coverage to reduce runoff and protect windward watersheds.
View full Kailua rules →Mililani Town, HI
Honolulu County
Mililani Town residential lots follow ROH Sec. 21-3.70-1 impervious caps. Homes permitted after May 1, 2019 are limited to 75 percent impervious coverage, with HOAs often requiring additional landscaped area.
View full Mililani Town rules →Key Facts Comparison
| Fact | Kailua | Mililani Town |
|---|---|---|
| - | - |
Highlighted rows indicate differences between cities.
Kailua FAQ
Does a gravel driveway count against coverage?
Gravel is generally treated as pervious, helping stay under the 75 percent cap, though compacted surfaces may count differently.
What if my existing home already exceeds 75 percent?
Older lots may be grandfathered, but any major expansion or rebuild will typically require compliance with current caps.
Mililani Town FAQ
Can I extend my driveway to fit an extra vehicle?
Possibly, but confirm total impervious coverage stays under 75 percent and HOA approves the revised frontage design.
Does a covered lanai count as impervious?
Yes, roofed lanais typically count as impervious for coverage calculations, even if the floor is open slab or deck.
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