Lot Coverage Limits: Ewa Gentry vs Waipahu
How do lot coverage limits rules compare between Ewa Gentry, HI and Waipahu, HI?
Waipahu has fewer restrictions than Ewa Gentry.
Ewa Gentry, HI
Honolulu County
ROH Sec. 21-3.70-1 imposes impervious-surface caps on Ewa Gentry homes, including a 75 percent impervious limit for dwellings permitted after May 1, 2019.
View full Ewa Gentry rules →Waipahu, HI
Honolulu County
Waipahu lot coverage follows ROH 21-3.70-1, capping impervious surface at 75 percent for dwellings permitted after May 1, 2019, straining tight plantation and multi-generational lots.
View full Waipahu rules →Key Facts Comparison
| Fact | Ewa Gentry | Waipahu |
|---|---|---|
| - | - | |
| Impervious cap | - | 75 percent |
| Effective date | - | May 1, 2019 |
| Code section | - | ROH 21-3.70-1 |
| Stream overlay | - | Chapter 14 drainage |
Highlighted rows indicate differences between cities.
Ewa Gentry FAQ
Does a grass paver driveway count as impervious?
Partially pervious surfaces may reduce the counted impervious area, but classification is determined by DPP during plan review.
Do pools count toward lot coverage?
Pool water surfaces and surrounding decks typically count toward impervious coverage in Ewa Gentry.
Waipahu FAQ
What is the Waipahu impervious limit?
Dwellings permitted after May 1, 2019 cap impervious surface at 75 percent of the lot under ROH 21-3.70-1. Driveways, patios, and pool decks all count toward the limit on narrow plantation lots.
Do older Waipahu homes need to comply?
Pre-2019 homes exceeding the 75 percent cap are typically legally nonconforming. Substantial redevelopment, demolition, or expansion triggers full compliance with the current ROH 21-3.70-1 impervious cap.
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