ADU Laws in North Carolina (2026)
North Carolina state ADU law details, key provisions, preemption status, and recent legislative changes for accessory dwelling units.
Law Name
North Carolina House Bill 488 (Session Law 2023-87)
Effective Date
2023-10-01
Preempts Local Ordinances
Yes — state law overrides local restrictions
Has State Law
Yes
Key Provisions
Requires all municipalities with population over 10,000 to allow ADUs by-right on all residential lots
Prohibits municipalities from requiring more than 1 parking space per ADU
Prohibits owner-occupancy requirements as a condition of ADU approval
Requires ministerial (non-discretionary) approval for code-compliant ADU applications
Applies to both detached and attached ADUs in all residential zones
Local municipalities may set reasonable size standards but cannot prohibit ADUs outright
Covers municipalities with populations over 10,000 — smaller municipalities retain more local control
Legislative History
2023 — HB 488
Comprehensive ADU reform — requires ADUs by-right in all NC municipalities over 10,000 population, prohibits local restrictions on parking (max 1 space) and owner-occupancy, mandates ministerial approval for code-compliant applications. Effective October 1, 2023.
Official Sources
What Does Preemption Mean for Local Cities?
Because North Carolina law preempts local ordinances, individual cities cannot impose restrictions stricter than the state standard. A city may still have additional administrative requirements, but cannot deny ADU applications that comply with state minimums.
Learn about North Carolinazoning preemption →Source: North Carolina House Bill 488 (Session Law 2023-87). Last verified April 5, 2026. View source