Apex, NC Accessory Structures: Garage Conversions (2026)

A garage-to-living-space conversion is a structural alteration and a change of occupancy classification under the 2018 NC Residential Code as adopted by Apex Building Inspections 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 a sink, range, and refrigerator) and a separate entrance, it becomes an Accessory Apartment under Apex UDO Sec. 4.5.6. The detached accessory apartment is capped at 40 percent of the principal dwelling's heated square footage (50 percent or 1,000 sq ft, whichever is smaller, in the Small Town Character Overlay District). Common ownership with the principal dwelling is required in residential zones (Sec. 4.5.6.G). The Apex Inspections checklist for additions/alterations to accessory structures requires plans showing existing and proposed conditions, code-compliant egress, smoke/CO alarms, and electrical service. If the conversion eliminates an off-street parking space and the dwelling's parking thereby falls below the UDO minimum for the zoning district, replacement parking must be added on the driveway, an extended driveway, or a paved pad. Note: Apex does not specify a minimum number of off-street parking spaces for single-family dwellings in the residential district tables (Sec. 5.1.1) — single-family dwellings in Apex typically meet parking minimums with driveways serving the principal dwelling.