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 actively preempts local restrictions, making ADU approval a streamlined ministerial 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 1200 sq ft (max height: 25 feet). Attached ADU: No greater than primary dwelling floor area, up to 1,200 sqft. 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 | 1200 sq ft | 25 feet |
| Attached ADU | No greater than primary dwelling floor area, up to 1,200 sqft | Per zone height limit |
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: $1,200-$5,000 total permit fees for typical ADU. Raleigh Water impact fees for ADU connections vary by meter size. Fee schedule: https://raleighnc.gov/planning/permits
| 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 | $1,200-$5,000 total permit fees for typical ADU |
Permit Timeline
Raleigh ADU Permit Timeline: Raleigh Development Services processes building permits. Standard ADU permit: 4-8 weeks plan review. Construction typically 3-9 months. Raleigh has an online permit portal for tracking. Apply through the Raleigh Development Services — Inspections Department online permit portal. Phone: (919) 996-2500.
Setback Requirements
ADU Setback Requirements in Raleigh: Front setback: Same as zone standard. Side setback: 5 feet. Rear setback: 10 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: NC HB 488 prohibits requiring more than 1 parking space per ADU. Raleigh UDO requires no additional parking for ADUs in most urban areas and near transit. Maximum 1 space per ADU in suburban residential zones.
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
State Law & Preemption
State Preemption: North Carolina House Bill 488 (Session Law 2023-87, effective October 1, 2023) requires all municipalities with population over 10,000 to allow ADUs by-right on all residential lots. Raleigh complies with state law. Raleigh's UDO was updated to reflect HB 488 requirements. Raleigh also has its own missing middle housing provisions that expand housing options beyond state minimums.
Historic 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/historic-development
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 1,200 square feet.
How long does it take to get an ADU permit in Raleigh?
The typical ADU permit timeline in Raleigh is Raleigh Development Services processes building permits. Standard ADU permit: 4-8 weeks plan review. Construction typically 3-9 months. Raleigh has an online permit portal for tracking.. Total estimated permit fees are $1,200-$5,000 total permit fees for typical ADU.
Do I need extra parking for an ADU in Raleigh?
No, Raleigh does not require additional parking for ADUs.
Do I have to live on-site to have an ADU in Raleigh?
No, owner-occupancy is not required for ADUs in Raleigh.
Source: Raleigh Unified Development Ordinance; NC Session Law 2023-87 (HB 488). Last verified April 5, 2026. View source