Grading & Drainage: Kailua vs Urban Honolulu
How do grading & drainage rules compare between Kailua, HI and Urban Honolulu, HI?
Kailua has fewer restrictions than Urban Honolulu.
Kailua, HI
Honolulu County
Kailua projects that cut, fill, stockpile, or trench earth generally need a grading permit under ROH Chapter 18A, with drainage controls reviewed as part of the permit.
View full Kailua 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 | Kailua | 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.
Kailua FAQ
Does landscaping need a grading permit?
Minor landscaping is usually exempt, but significant cut or fill, retaining walls, or driveway regrading typically require a permit.
Can I stockpile fill on my lot?
Extended stockpiling can trigger Chapter 18A Article 3 requirements, including erosion controls and potentially a permit.
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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