Lot Coverage Limits: Kailua vs Mililani Mauka
How do lot coverage limits rules compare between Kailua, HI and Mililani Mauka, HI?
Kailua and Mililani Mauka 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 Mauka, HI
Honolulu County
ROH Sec. 21-3.70-1 imposes impervious-surface caps on Mililani Mauka lots, including a 75 percent impervious limit for dwellings permitted after May 1, 2019.
View full Mililani Mauka rules →Key Facts Comparison
| Fact | Kailua | Mililani Mauka |
|---|---|---|
| - | - |
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 Mauka FAQ
Can I pave over my front yard for more parking?
Full front-yard paving often exceeds the 75 percent impervious cap and conflicts with MTA front-yard landscape rules.
Do decks count toward impervious coverage?
Solid-surface decks generally count as impervious, while open-slatted decks over pervious ground may count less.
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