Honolulu County regulates overgrown vegetation as a public nuisance under ROH Chapter 16A rather than setting a fixed grass height, applied island-wide across Oahu by the Department of Planning and Permitting.
ROH Chapter 16A, Article 2 (formerly Chapter 41, Article 10) defines weeds as vegetation that creates fire hazard, harbors vermin, impedes sidewalks or roads, or obstructs waterways. There is no specific inch-based grass height limit in Honolulu County code; enforcement is complaint-driven and condition-based across the island. The Department of Planning and Permitting issues a notice of violation to property owners with a 30-day compliance window. Rural Oahu parcels, windward pasture lots, and leeward dry areas with wildfire risk receive closer scrutiny.
Failure to abate within 30 days allows the county to enter the property, remove vegetation, and bill the owner; costs may become a lien against the property.
Honolulu County, HI
Honolulu County's Building Code Section 16-6.2 requires residential swimming pools on Oahu to be enclosed by compliant fences or protective barriers to preve...
Honolulu County, HI
Honolulu's LUO Section 21-4.40 limits retaining wall heights in required yards to 6 feet when containing fill and combines terraced wall heights for measurem...
Honolulu County, HI
Honolulu's LUO Section 21-4.60 defines 'fence' and governs allowed materials including wrought iron, wire, wood, vinyl, and plastic supported by post foundat...
Honolulu County, HI
Honolulu's Land Use Ordinance Section 21-4.30 defines required yards and street setbacks, including what fences and structures may occupy property lines shar...
Honolulu County, HI
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 ...
Honolulu County, HI
Honolulu's Land Use Ordinance Section 21-4.60 limits fence, wall, and hedge heights across zoning districts and imposes additional setback or landscape scree...
See how Honolulu County's grass height limits rules stack up against other locations.
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