Johnston County, NC Accessory Structures: Shed & Carport Rules (2026)

Johnston County Code § 14-75 governs accessory buildings and storage structures in the Agricultural-Residential (AR) zoning district, the county's default rural residential classification covering most of unincorporated Johnston County. Under § 14-75(b)(7), any accessory building or structure must sit at least ten feet from an interior property line and still meet the district's street setback in § 14-75(d): 70 feet from an arterial or collector street, 50 feet from a local street outside a major subdivision (25 feet inside one), and 15 feet from any access easement.

The section also bars singlewide mobile homes from being used for storage, commercial or noncommercial, and lets planning staff approve temporary storage containers or PODs for a 30-day period, with one 30-day hardship extension allowed no more than twice a calendar year. A dedicated storage-building rule, § 14-75(b)(16), sets a harder cap for freestanding sheds and outbuildings used for personal storage: 2,000 square feet maximum, no placement inside a major subdivision, and no commercial, industrial, or business use of the space, only storage tied to a use already permitted in the AR district.

Its setbacks run 70 feet from an arterial or collector street, 50 feet from a local street, and 20 feet from any interior lot line, tighter street setbacks than ordinary accessory buildings get but a fixed square-footage ceiling those buildings don't carry. An owner planning a shed larger than a typical prefabricated unit should check both provisions before pouring a slab, since exceeding 2,000 square feet moves the structure outside the by-right storage-building allowance and back under the general accessory-building rule in § 14-75(b)(7), which has no size cap but a shorter interior setback.