Side by side · North Carolina
Compare ADU rules across North Carolina
Flexible on where you build? The same backyard cottage can be routine in one city and impossible next door. This table puts 2 North Carolina cities side by side so you can shortlist the friendly ones before reading a single ordinance, or narrow it to just the cities you are deciding between. Every value is summarized from the city's own code; open a city's page for the full notes, citations, and fine print.
The short answers
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| City | Detached ADU | Attached / internal | Max size | Owner occupancy | Extra parking | Approval |
|---|---|---|---|---|---|---|
| Durham | Allowed | Allowed | 1,000 sq ft on a single story and 1,200 heated sq ft total; in the RR District up to 50% of the primary dwelling's heated floor area on lots of 4+ acres; the ADU may never equal or exceed the primary structure's floor area | Not required | None; no parking is required for an accessory dwelling | Permitted use |
| Raleigh | Allowed | Allowed | 800 sq ft on residential lots up to 40,000 sq ft; 1,000 sq ft on lots over 40,000 sq ft; 800 sq ft in mixed-use districts (RX, OX, NX, CX); always less than the gross floor area of the principal dwelling; manufactured-home ADUs capped at 600 sq ft | Not required | No. The city's official ADU FAQ states "Additional parking does not have to be provided with an ADU", and UDO 2.6.3/3.6.2 impose no ADU parking requirement. | Permitted use |
Summarized from each city's ordinance text, most recently read July 2026. Tap a value marked with an info icon to see exactly what it depends on, straight from the ordinance. Nearly every value has zone, lot-size, or process caveats beyond that; the per-city pages carry the full notes and code citations. Treat this as orientation, not a permit determination.
These rules change. Be first to know.
Cities amend ADU ordinances all the time. Get one short email when any North Carolina city in this table changes its rules; no newsletter, no noise.
Reading the table
- Detached ADU is the make-or-break column for backyard cottages: minimum lot sizes (often 8,000 to 14,500 sq ft) hide behind many of the "Allowed" values, so check your lot before celebrating.
- Attached / internal (basement apartments, additions) is legal almost everywhere and is usually the path of least resistance.
- Approval: "Permitted use" means staff-level sign-off; "Conditional use" means a public hearing, which adds time, cost, and uncertainty.
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