Durham, NC Accessory Structures: Garage Conversions (2026)

Converting an existing garage to an accessory dwelling unit is permitted in Durham under UDO Section 5.4.2. Since ADUs do not require a special use permit or additional parking, garage conversions are a straightforward path to adding a dwelling unit. The converted space must meet the 1,200 square foot maximum heated area limit for ADUs and cannot equal or exceed the primary structure in floor area. A building permit is required and the conversion must bring the space up to NC Building Code standards for habitable occupancy including proper egress windows, insulation, electrical circuits, plumbing if applicable, smoke and carbon monoxide detectors, and HVAC. Interior conversions have no additional height restrictions. If the garage is detached, it follows accessory structure setback rules with a minimum 5-foot rear and side property line setback for structures under 15 feet. The conversion is prohibited in Special Flood Hazard Areas. No owner-occupancy requirement applies to the ADU. Homeowners should verify that their HOA covenants do not prohibit the conversion, as HOA restrictions operate independently of city zoning.