ADU rules in East Honolulu, HI — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
East Honolulu homeowners in Hawaii Kai and Aina Haina may build one accessory dwelling unit per zoning lot in eligible residential districts, subject to parking, occupancy, and rental-duration limits under the Honolulu Land Use Ordinance.
ROH Sec. 21-5.720 permits one ADU per zoning lot in Country, R-3.5, R-5, R-7.5, R-10, and R-20 districts, which covers most residential areas of East Honolulu. ADUs must meet minimum lot-size, parking, and setback standards. Short-term rentals under 30 days are prohibited for ADUs. The ordinance includes after-the-fact permit provisions for structures built without permits before September 14, 2015. Ordinance 25-2 (2025) amended several provisions. Homeowners must secure a building permit before beginning construction and comply with setback rules in Sec. 21-4.30.
Building an ADU without a permit, operating it as a short-term rental, or exceeding one ADU per lot may result in fines and abatement orders.
East Honolulu, HI
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East Honolulu, HI
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East Honolulu, HI
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Side-by-side rule comparisons with other cities in Honolulu County.
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