ADU rules in Kapolei, HI — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Kapolei homeowners may build one ADU per zoning lot in eligible residential districts under ROH Sec. 21-5.720, subject to size, parking, owner-occupancy, and 30-day minimum rental rules.
As Oahu's Second City, Kapolei mixes master-planned residential neighborhoods with commercial and mixed-use areas. For homes in Country, R-3.5, R-5, R-7.5, R-10, or R-20 districts, ROH Sec. 21-5.720 allows one accessory dwelling unit per zoning lot. ADUs must meet minimum lot size, provide off-street parking, and observe the citywide prohibition on rentals shorter than 30 days. Ordinance 25-2 (2025) refined the rules and expanded after-the-fact permit options for unpermitted units built before September 14, 2015. Homeowners in planned-community Kapolei subdivisions should also check their association covenants, which may add design review or further limit ADU use.
Building without permits, undersized parking, or short-term rental of an ADU can trigger notices of violation and daily fines.
Kapolei, HI
ROH Sec. 16-6.2 requires Kapolei residential swimming pools to be enclosed by a complete barrier with self-closing gates designed to prevent access by young ...
Kapolei, HI
ROH Sec. 21-4.40 limits fill-containing retaining walls in Kapolei to six feet within required yards and combines terraced wall heights for compliance measur...
Kapolei, HI
ROH Sec. 21-4.60 defines fences to include wrought iron, wire, wood, vinyl, and plastic, giving Kapolei residents a broad palette of compliant materials.
Kapolei, HI
ROH Sec. 21-4.30 controls what Kapolei neighbors can install in required yards along shared property lines, since Honolulu does not have a dedicated city spi...
Kapolei, HI
Public parks in Kapolei are closed during posted night hours under ROH Sec. 10-1.2, though beach parks allow direct traverse to the shoreline during closure.
Kapolei, HI
Kapolei follows HRS Sec. 577-16, which bars children under 16 from public places between 10 p.m. and 4 a.m. without a parent or guardian; Honolulu has no sep...
Side-by-side rule comparisons with other cities in Honolulu County.
See how other cities in Honolulu County handle adu rules.
See how Kapolei's adu rules rules stack up against other locations.
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