Greensboro, NC Accessory Structures: ADU Rules (2026)

Greensboro allows accessory dwelling units in all residential zoning districts as an accessory use to a single-family residence under Land Development Ordinance Section 30-8-11.2. The city adopted significant amendments in April 2024 that made ADUs considerably easier to build. The key changes include removal of the previous 400-square-foot minimum size requirement, elimination of the owner-occupancy mandate (previously required the owner to live in either the main house or the ADU), and alignment of ADU setbacks with the less restrictive accessory structure standards rather than the principal building setback standards. ADUs may be internal (within the existing dwelling), attached (as an addition), or detached (as a separate structure on the lot). The maximum size of an ADU is 50 percent of the floor area of the primary dwelling. Detached ADUs typically have a practical cap near 800 square feet. ADU setbacks now follow accessory structure standards, generally requiring a minimum of 3 feet from side and rear property lines, with structures over 15 feet tall requiring a 10-foot setback. At least one additional off-street parking space must be provided for the ADU beyond what the primary dwelling requires, though properties near qualifying transit corridors may be eligible for a parking waiver. ADUs must complement the primary dwelling in materials, roof pitch, and exterior finishes. Properties in historic districts require review by the Historic Preservation Commission. North Carolina does not have a statewide ADU mandate, so Greensboro regulations are entirely local. A residential building permit is required for any new ADU construction or conversion.