Lot Coverage Limits: Pearl City vs Waipahu
How do lot coverage limits rules compare between Pearl City, HI and Waipahu, HI?
Pearl City and Waipahu have similar restriction levels.
Pearl City, HI
Honolulu County
Pearl City lot coverage follows ROH 21-3.70-1, capping impervious surface at 75 percent for dwellings permitted after May 1, 2019, including homes in Waimalu, Manana, and Pearl City Highlands.
View full Pearl City 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 | Pearl City | Waipahu |
|---|---|---|
| Impervious cap | 75 percent | 75 percent |
| Effective date | May 1, 2019 | May 1, 2019 |
| Code section | ROH 21-3.70-1 | ROH 21-3.70-1 |
| Drainage overlay | Chapter 14 applies | - |
| Stream overlay | - | Chapter 14 drainage |
Highlighted rows indicate differences between cities.
Pearl City FAQ
What is the Pearl City impervious limit?
Dwellings permitted after May 1, 2019 cap impervious surface at 75 percent of the lot under ROH 21-3.70-1. Driveways, pool decks, and patios count, pushing designs toward permeable surfaces.
Do older Manana homes have to comply?
Pre-2019 homes exceeding the 75 percent cap are typically legally nonconforming. Substantial redevelopment or expansion can trigger full compliance with the current ROH 21-3.70-1 impervious cap.
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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