Garage conversion rules in Kailua, HI — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Converting a Kailua garage into living space is regulated as ADU creation under the Land Use Ordinance, requiring permits, parking replacement, and compliance with occupancy rules.
Garage conversions in Kailua fall under ROH Sec. 21-5.720 when the converted space becomes a dwelling. This means conversions are treated as ADUs and must meet all ADU requirements including one-per-lot limits, minimum rental terms, and parking standards. Lost garage parking typically must be replaced elsewhere on the lot. Separate building permits are required under ROH Sec. 18-3.2. After-the-fact permits may be available for garage conversions completed before September 14, 2015. Kailua's older subdivisions often contain informal conversions that may benefit from legalization.
Unpermitted conversions, insufficient parking replacement, and illegal short-term rental use trigger notices of violation and corrective action.
Kailua, HI
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Kailua, HI
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Kailua, HI
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Side-by-side rule comparisons with other cities in Honolulu County.
See how other cities in Honolulu County handle garage conversions.
See how Kailua's garage conversions rules stack up against other locations.
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