Accessory Structures in Urban Honolulu, HI (2026)
5 verified accessory structures rules for Urban Honolulu, Hawaii, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Most Urban Honolulu lots sit in apartment or mixed-use zones where ADUs under ROH Sec. 21-5.720 are not permitted; ADUs are generally limited to R-5 through R-20 single-family neighborhoods like Manoa, Kaimuki, and Nuuanu.
ADU Rules in Dense Urban Honolulu
Some RestrictionsShed Rules
On Urban Honolulu's typically small residential lots, sheds must meet tighter effective clearances under ROH Sec. 21-4.30 setbacks and Sec. 21-4.60 height limits, with smaller sheds potentially exempt from building permits.
Shed Rules on Small Urban Honolulu Lots
Few RestrictionsGarage Conversions
Urban Honolulu garage conversions must meet ADU rules in ROH Sec. 21-5.720 plus building-permit requirements in Sec. 18-3.2, and lost parking must be replaced on-lot even on tight urban parcels.
Garage Conversions on Urban Honolulu Parcels
Some RestrictionsCarport Rules
Urban Honolulu carports must comply with the 20-by-20-foot horizontal limit in ROH Sec. 21-2.140-1, with Type V-B hillside carports allowed extra height in mauka neighborhoods like Makiki Heights and Manoa.
Carport Dimensions on Urban Honolulu Lots
Few RestrictionsTiny Homes
Urban Honolulu has no dedicated tiny-home ordinance; permanent tiny homes are regulated as ADUs under ROH Sec. 21-5.720, which effectively limits them to R-5 through R-20 neighborhoods outside the dense apartment core.
Tiny Homes in Urban Honolulu
Some RestrictionsLooking for Honolulu County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Urban Honolulu city rules.
Accessory Structures in Honolulu County →