3 county-level rules, plus city-specific rules for 3 cities in Wake County, North Carolina.
Verified from official government sources
Wake County permits accessory dwelling units (ADUs) on lots in unincorporated Wake County that are zoned for single-family or multifamily residential use, subject to compliance with the development standards of the Wake County Unified Development Ordinance (UDO). The County's published ADU program (wake.gov) confirms an ADU is "a secondary dwelling unit that is subordinate to the primary dwelling," contains its own kitchen, bedroom, and bathroom, and may be either attached (within or connected to the primary dwelling) or detached (a separate building or a garage conversion on the same lot). Wake County does NOT require the property owner to live on the property. An ADU must provide at least one off-street parking space beyond what is required for the primary dwelling, and if the lot is served by a septic system the design flow may need to be re-evaluated by Wake County Environmental Services — Onsite Water Protection before the building permit is issued. ADUs inside the incorporated cities and towns of Wake County are governed by each municipality's own ordinance and may differ.
Wake County Unified Development Ordinance — ADU Requirements & Eligibility
An ADU is a secondary dwelling unit that is subordinate to the primary dwelling. The ADU can either be: 1. A part of the primary dwelling (including an addition), or 2. Detached, on the same lot as the primary dwelling. An ADU needs a kitchen, provisions for sanitation and sleeping. There must also be at least one off-street parking space in addition to what is required for the primary dwelling...
Wake County, NC regulates sheds and other detached accessory structures in unincorporated areas through the county Unified Development Ordinance (UDO) and the NC Residential Code. Per Wake County Permits and Inspections, "Accessory buildings with any dimension greater than 12' require a building permit." A shed where no dimension exceeds 12 feet is exempt from a Wake County building permit, but a Land Use Permit from Planning and Zoning may still be required and all UDO setback/placement rules apply. The 12-foot rule is stricter than the NC Residential Code §R105.2 model (which exempts detached accessory structures under ~130 sq ft / 12 sq m). For parcel-specific requirements call Wake County Permits at 919-856-6222.
Wake County Permits & Inspections — Build an Accessory Building
Accessory buildings with any dimension greater than 12' require a building permit. An accessory building is a detached building, like a shed or detached garage, that is on the same lot as a single or two-family home but is used for a different purpose. All plans are required to be designed to meet the 2018 North Carolina Residential Code. Properties with septic systems require verification that...
Wake County, NC allows converting a garage into a separate dwelling unit through its Accessory Dwelling Unit (ADU) program. The Wake County Permit Guidance on ADUs identifies five recognized ADU types, including garage conversions. A converted-garage ADU must be subordinate to the primary dwelling and provide independent kitchen, sanitation, and sleeping facilities plus at least one off-street parking space beyond the primary dwelling's requirement. A building permit and Land Use Permit are required, and the conversion must meet 2018 NC Residential Code rules for habitable space. Garage conversions that remain integrated living space (not a separate dwelling unit) also require a permit through Permits and Inspections.
3 cities in Wake County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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