Lot Coverage Limits: Mililani Town vs Pearl City
How do lot coverage limits rules compare between Mililani Town, HI and Pearl City, HI?
Pearl City has fewer restrictions than Mililani Town.
Mililani Town, HI
Honolulu County
Mililani Town residential lots follow ROH Sec. 21-3.70-1 impervious caps. Homes permitted after May 1, 2019 are limited to 75 percent impervious coverage, with HOAs often requiring additional landscaped area.
View full Mililani Town rules →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 →Key Facts Comparison
| Fact | Mililani Town | Pearl City |
|---|---|---|
| - | - | |
| 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.
Mililani Town FAQ
Can I extend my driveway to fit an extra vehicle?
Possibly, but confirm total impervious coverage stays under 75 percent and HOA approves the revised frontage design.
Does a covered lanai count as impervious?
Yes, roofed lanais typically count as impervious for coverage calculations, even if the floor is open slab or deck.
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.
Compare other topics
See how Mililani Town and Pearl City compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool