Grading & Drainage: Kapolei vs Urban Honolulu
How do grading & drainage rules compare between Kapolei, HI and Urban Honolulu, HI?
Kapolei and Urban Honolulu have similar restriction levels.
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 →Urban Honolulu, HI
Honolulu County
Tower excavations and infill projects in Urban Honolulu must obtain grading permits under ROH Chapter 18A, with dewatering, shoring, and drainage coordination critical in Kakaako and Ala Moana's high water-table conditions.
View full Urban Honolulu rules →Key Facts Comparison
| Fact | Kapolei | Urban Honolulu |
|---|---|---|
| - | - | |
| Authority | - | ROH Chapter 18A |
| Application | - | Sec. 18A-2.2 |
| No-permit penalty | - | Sec. 18A-2.4A |
| Urban concern | - | Dewatering, shoring |
| Bonds | - | Required |
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.
Urban Honolulu FAQ
Does a Kakaako tower need a grading permit even on a small lot?
Yes. Basement excavation easily exceeds Chapter 18A thresholds, and Sec. 18A-2.2 requires a full permit application including hydrology and shoring plans before work.
How is dewatering handled in Urban Honolulu excavations?
Grading plans must coordinate with ROH Chapter 43 Article 11 stormwater rules. Dewatering discharges typically require separate NPDES coverage and cannot be released untreated.
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