Lot Coverage Limits: Ewa Gentry vs Urban Honolulu
How do lot coverage limits rules compare between Ewa Gentry, HI and Urban Honolulu, HI?
Urban Honolulu 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 →Urban Honolulu, HI
Honolulu County
Urban Honolulu caps impervious surface at 75 percent of lot area for residential dwellings permitted after May 1, 2019, under ROH 21-3.70-1 to manage runoff into the city's storm drains.
View full Urban Honolulu rules →Key Facts Comparison
| Fact | Ewa Gentry | Urban Honolulu |
|---|---|---|
| - | - | |
| Impervious cap | - | 75 percent |
| Effective date | - | May 1, 2019 |
| Code section | - | ROH 21-3.70-1 |
| Flood concern | - | Ala Wai 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.
Urban Honolulu FAQ
How much of an Urban Honolulu lot can be paved?
For residential dwellings permitted after May 1, 2019, ROH 21-3.70-1 limits impervious coverage to 75 percent. Older homes follow the standards in effect when they were permitted.
Do pool decks count toward Honolulu lot coverage?
Generally yes. Pool decks, patios, driveways, and roofed accessory structures count toward the 75 percent impervious cap under ROH 21-3.70-1. Pervious pavers with approved drainage can earn partial credit.
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