ADU Rules in Raleigh, NC (2026)
ADU rules, permit requirements, size limits, and fees for Raleigh, NC. Source-cited from official municipal code.
Yes, ADUs are allowed in Raleigh, NC.
Raleigh, NC permits accessory dwelling units (ADUs) on residential properties. ADUs — also called granny flats, in-law units, backyard cottages, or secondary suites — are secondary housing units on a single-family or multifamily lot. State and local law governs the approval process. In Raleigh, the local building department handles ADU permit applications. Below you will find the current size limits, setbacks, fees, and timeline for building an ADU in Raleigh.
ADU Size Limits
ADU Size Limits in Raleigh: Detached ADU: up to 1000 sq ft (max height: 26 feet). Attached ADU: The gross floor area of the accessory dwelling shall be less than the gross floor area of the total principal dwelling. Gross floor area shall include all conditioned space. Attached unconditioned space shall be included in the calculation of accessory structure floor area. If two ADUs are located on one lot, each ADU shall be permitted a maximum gross floor area as described in Section 2.6.3.G.
| Type | Max Size | Max Height |
|---|---|---|
| Detached ADU | 1000 sq ft · Verified May 31, 2026 · Source | 26 feet · Verified May 31, 2026 · Source |
| Attached ADU | The gross floor area of the accessory dwelling shall be less than the gross floor area of the total principal dwelling · Verified July 14, 2026 · Source | Except as specifically set forth in this section, the allowed uses, the dimensional requirements, height limits and general development standards of the underlying zoning district apply. · Verified July 14, 2026 · Source |
Permit Fees
ADU Permit Fees in Raleigh: Plan check fee: Varies. Building permit fee: Varies. Impact fees: None. School fees: None or N/A. Total estimated permit cost: Varies.
| Fee Type | Amount |
|---|---|
| Plan Check | $250-$1,200 |
| Building Permit | Based on construction valuation — typically $800-$3,500 |
| Impact Fees | Water/sewer impact fees may apply — Raleigh charges connection fees for new water/sewer services |
| School Fees | None |
| Total Estimate | None |
Permit Timeline
Raleigh ADU Permit Timeline: Permit timeline has not been confirmed — contact the department for current processing times. Apply through the local building department online permit portal. Phone: (919) 996-2500.
Setback Requirements
ADU Setback Requirements in Raleigh: Front setback: Must be located at or behind the front wall of the house. Side setback: 5 feet. Rear setback: 5 feet. H5 From alley (min) 4' without parking / 20' with parking 4' without parking / 20' with parking 4' without parking / 20' with parking
Parking Requirements
Parking Requirements: Parking requirements have not been confirmed — see official source.
Restrictions & Requirements
- ADU must comply with Raleigh UDO setback and lot coverage standards
- ADU cannot be sold separately from principal dwelling
- Short-term rental of ADU requires Raleigh STR permit
- ADU must have permanent foundation
- Exterior design of ADU should be compatible with primary structure
- ADU access must not interfere with parking or circulation on lot
How Many ADUs Are Allowed?
Number of ADUs Allowed in Raleigh: Single-family lots: There shall be no more than one ADU on the same lot as a principal dwelling unless it is located in a Frequent Transit Area as shown on the City's Comprehensive Plan which would then allow for up to two ADUs on the same lot as a principal dwelling.. Multifamily properties: not confirmed — see official source.
- Single-Family Lots
- There shall be no more than one ADU on the same lot as a principal dwelling unless it is located in a Frequent Transit Area as shown on the City's Comprehensive Plan which would then allow for up to two ADUs on the same lot as a principal dwelling. · Verified July 14, 2026 · Source
- Multifamily Properties
- ADUs and additional units permitted in RX and MX zones per Raleigh UDO
Statewide Preemption
ADU Preemption
North Carolina's official source could not be reached to confirm statewide ADU preemption.
View North Carolina preemption detailsFrequently Asked Questions
Can I build an ADU in Raleigh?
Yes. Raleigh, NC allows accessory dwelling units. On a single-family lot you can build There shall be no more than one ADU on the same lot as a principal dwelling unless it is located in a Frequent Transit Area as shown on the City's Comprehensive Plan which would then allow for up to two ADUs on the same lot as a principal dwelling..
How big can an ADU be in Raleigh?
The maximum size for a detached ADU in Raleigh is 1,000 square feet.
How long does it take to get an ADU permit in Raleigh?
The typical ADU permit timeline in Raleigh is Not available — permit timelines not codified in UDO.
Do I need extra parking for an ADU in Raleigh?
Raleigh parking rules for ADUs: No parking requirement stated in UDO Sec. 2.6.3
Do I have to live on-site to have an ADU in Raleigh?
Owner-occupancy requirement in Raleigh: No owner-occupancy requirement found in UDO
Source: Raleigh Unified Development Ordinance; NC Session Law 2023-87 (HB 488). Last verified April 5, 2026. View source