Chapel Hill, NC Accessory Structures: Garage Conversions (2026)

A garage-to-living-space conversion is a structural alteration and a change of occupancy classification (Group U to Group R-3) under the 2018 NC Residential Code as adopted by Chapel Hill Building and Development Services under NCGS § 160D-1107. A building permit is required, and an electrical permit is required for any added or modified wiring. The converted space must meet code minimums: 7 ft minimum ceiling height (R304), light and ventilation (R303 — 8 percent glazing of floor area), egress windows from sleeping rooms (R310 — 5.7 sq ft net openable, 24 in minimum height, 20 in minimum width, 44 in maximum sill), smoke alarms in each sleeping room, hallway, and on each level (R314), CO alarms outside each sleeping area (R315), and the 2018 NC Energy Code insulation values. If the conversion adds cooking facilities (any kitchen with sink, range, and refrigerator) and a separate entrance, the result is an accessory apartment under the LUMO — one per lot is permitted, and the post-January 2026 maximum size is 1,000 sq ft (the prior 75-percent-of-primary cap was replaced). Detached accessory apartments must be located in the established rear yard and meet the primary residence's side and rear setback requirements for the underlying zoning district. The January 21, 2026 LUMO amendments eliminated minimum parking requirements, so replacement off-street parking is no longer required when a garage conversion eliminates the existing parking space (though residents typically retain driveway parking). Chapel Hill's Building and Development Services permit reviews include zoning compliance, building code, electrical, mechanical, and plumbing inspections. The Town Council's 2026 amendments also opened the door for an accessory dwelling unit to be placed on its own lot and sold separately in eligible districts — a structural change to the historic common-ownership requirement.