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 Raleigh Development Services — Inspections 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: size varies by zoning — see official source. Raleigh UDO limits detached ADUs to 1,200 sqft. Attached ADUs are limited to no more than the primary dwelling floor area. North Carolina does not use the JADU designation from California law.
| Type | Max Size | Max Height |
|---|---|---|
| Detached ADU | 1000 sq ft · Verified May 31, 2026 · Source | 26 feet · Verified May 31, 2026 · Source |
| Attached ADU | See official source | See official source |
Permit Fees
ADU Permit Fees in Raleigh: Plan check fee: $250-$1,200. Building permit fee: 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 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: Not available — permit timelines not codified in UDO Apply through the Raleigh Development Services — Inspections 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. Detached ADUs must maintain 5 ft side and 10 ft rear setbacks in residential zones. Front setback same as principal dwelling zone standard. Raleigh UDO Section 2.3.
Parking Requirements
Parking Requirements: No parking requirement stated in UDO Sec. 2.6.3
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: 1 ADU per residential lot (per NC HB 488). Raleigh missing middle provisions may allow additional units in some zones.. Multifamily properties: ADUs and additional units permitted in RX and MX zones per Raleigh UDO. NC HB 488 requires at least 1 ADU per residential lot by-right. Raleigh's missing middle housing provisions allow duplexes and triplexes in R-4 and higher zones.
- Single-Family Lots
- 1 ADU per residential lot (per NC HB 488). Raleigh missing middle provisions may allow additional units in some zones.
- 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 detailsHistoric District Considerations
Historic District Requirements: Raleigh has 7 historic districts where additional design review may be required for ADU construction. Design review approval is required before obtaining a building permit for properties in historic overlay zones. Raleigh has several Historic Overlay districts (HOD) including Oakwood, Boylan Heights, Oakwood, and parts of downtown. Certificate of Appropriateness required for exterior alterations. Raleigh Historic Development Commission administers review. Look up historic district boundaries at: https://raleighnc.gov/planning-and-development/raleigh-historic-development-commission
Frequently Asked Questions
Can I build an ADU in Raleigh?
Yes. Raleigh, NC allows accessory dwelling units. On a single-family lot you can build 1 ADU per residential lot (per NC HB 488). Raleigh missing middle provisions may allow additional units in some zones..
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