East Honolulu vs Mililani Town
How do grading & drainage rules compare between East Honolulu, HI and Mililani Town, HI?
Mililani Town has fewer restrictions than East Honolulu.
East Honolulu, HI
Honolulu County
East Honolulu hillside lots in Mariner's Ridge, Kamilo Iki, and Kuliouou Valley require grading permits under ROH Chapter 18A when land disturbance exceeds permit thresholds.
View full East Honolulu rules →Mililani Town, HI
Honolulu County
Mililani cut, fill, and trenching projects generally require a grading permit under ROH Chapter 18A, with drainage review to protect neighbors and downstream gulches.
View full Mililani Town rules →Key Facts Comparison
| Fact | East Honolulu | Mililani Town |
|---|---|---|
| - | - |
Highlighted rows indicate differences between cities.
East Honolulu FAQ
Does a small retaining wall need a grading permit in Hawaii Kai?
Retaining walls and associated excavation typically require grading and building permits when they exceed minor thresholds in Chapter 18A, so confirm with the Department of Planning and Permitting before starting.
What happens if I grade without a permit?
Sec. 18A-2.4A imposes penalties for grading without a permit, and enforcement may include stop-work orders, restoration requirements, and fines.
Mililani Town FAQ
Do ADUs need a grading permit?
Many ADU projects require grading permits due to foundation excavation and drainage modifications around the structure.
Can I reroute roof runoff to my neighbor's lot?
No. Drainage must be directed to approved on-site locations or the public storm system, not onto adjacent properties.
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