Lot Coverage Limits: East Honolulu vs Mililani Mauka
How do lot coverage limits rules compare between East Honolulu, HI and Mililani Mauka, HI?
East Honolulu has fewer restrictions than Mililani Mauka.
East Honolulu, HI
Honolulu County
East Honolulu residential lot coverage follows ROH 21-3.70-1, which caps impervious surface at 75 percent for dwellings permitted after May 1, 2019, impacting Hawaii Kai marina and ridge parcels.
View full East Honolulu 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 | East Honolulu | Mililani Mauka |
|---|---|---|
| Impervious cap | 75 percent | - |
| Effective date | May 1, 2019 | - |
| Code section | ROH 21-3.70-1 | - |
| Drainage overlay | Chapter 14 applies | - |
| - | - |
Highlighted rows indicate differences between cities.
East Honolulu FAQ
What is the Hawaii Kai impervious limit?
Dwellings permitted after May 1, 2019 cap impervious surface at 75 percent of the lot under ROH 21-3.70-1. Pools, driveways, and patios count toward the limit, pushing designs toward permeable surfaces.
Do older Portlock homes have to comply?
Pre-2019 homes that exceed the 75 percent cap are typically legally nonconforming. Substantial redevelopment or expansion can trigger full compliance with the current ROH 21-3.70-1 limit.
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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