Kapolei vs Mililani Town
How do grading & drainage rules compare between Kapolei, HI and Mililani Town, HI?
Mililani Town has fewer restrictions than Kapolei.
Kapolei, HI
Honolulu County
Kapolei grading, grubbing, stockpiling, and drainage work is regulated by ROH Chapter 18A, which requires permits, bonds, and inspections for qualifying land-disturbing activity.
View full Kapolei 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 | Kapolei | Mililani Town |
|---|---|---|
| - | - |
Highlighted rows indicate differences between cities.
Kapolei FAQ
Do I need a permit for a retaining wall and regrade in Kapolei?
Yes, if the project meets the thresholds in Chapter 18A, you need a grading permit and often an erosion and sediment control plan.
What if I find my contractor graded without a permit?
Sec. 18A-2.4A treats this as a violation, and the Department of Planning and Permitting can issue penalties and require corrective measures.
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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