Lot Coverage Limits: East Honolulu vs Waipahu
How do lot coverage limits rules compare between East Honolulu, HI and Waipahu, HI?
East Honolulu and Waipahu have similar restriction levels.
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 →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 | East Honolulu | 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.
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.
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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