Honolulu County requires building permits for most fences and walls under ROH 18-3.1, though retaining or riprap walls not exceeding 30 inches in height are exempt from the permit requirement.
ROH Section 18-3.1 sits within the Building Code fee-and-permit chapter and identifies when a City and County of Honolulu building permit is required before construction. Fences and walls generally follow Chapter 18 thresholds: retaining walls or riprap walls 30 inches or less in height are exempt, while taller barriers, masonry walls, and any fence attached to a primary structure typically require a permit from the Department of Planning and Permitting (DPP). Permits confirm compliance with zoning height limits in ROH 21-4.60, setback rules in 21-4.30, and structural safety. Electrical components, pool enclosures, and retaining walls over 30 inches always need review.
Building without a required permit can result in stop-work orders, permit-after-the-fact fees (typically doubled), daily civil fines, and mandatory removal if the structure cannot be brought into compliance.
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