Lot Coverage Limits: East Honolulu vs Honolulu

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.

How much of my lot can I cover with buildings and pavement in Honolulu?

For residential dwellings permitted after May 1, 2019, ROH 21-3.70-1 caps impervious coverage at 75 percent of lot area. Older homes are subject to the standards in effect when permitted.

Do driveways count toward lot coverage?

Generally yes. Driveways, walkways, patios, and similar hard surfaces count toward the 75 percent impervious cap under ROH 21-3.70-1. Pervious pavers with approved drainage may be credited.