ADU rules in Durham County, NC — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Durham allows accessory dwelling units by right under its joint City-County Unified Development Ordinance. An ADU on a single-family or duplex lot is capped at 1,200 heated square feet total, limited to one per lot, and requires no added parking.
Durham City and Durham County share a Unified Development Ordinance (UDO) that governs both the City and the unincorporated county, so the same ADU rules apply to most residents. Section 5.4.2 permits one accessory dwelling on a residential lot developed with one or two primary dwellings, either attached to or detached from the main house. The heated floor area may not exceed 1,000 square feet on a single story and 1,200 square feet total, keeping the unit subordinate to the principal dwelling. Durham removed the on-site parking requirement, so no extra parking is mandated for the ADU. Because an ADU is a dwelling, it must also meet the North Carolina Residential Code for egress, ceiling height, and life-safety.
An ADU built without the required zoning approval or building permit is a UDO/building-code violation enforced by Durham City-County Planning and Inspections. Remedies include stop-work orders, civil penalties, and orders to correct or remove the unit.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Durham County's adu rules rules stack up against other locations.
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