Building an ADU in Charlotte

What you can build here

Charlotte's UDO defines an ADU as "an additional dwelling unit associated with and incidental to a principal dwelling," with its own cooking and sanitary facilities. It must be "clearly subordinate" to the main home.

You can add an ADU with a single-family home in any zoning district that allows single-family homes, or with a duplex in any district that allows duplexes, as long as the duplex units are not on sublots. Only one ADU is allowed on the lot, and it must stay under the same ownership as the main home.

ADUs are not allowed in manufactured homes, recreational vehicles, travel trailers, campers or other motor vehicles. See our backyard tiny house guide for other options.

The city's ADU page says the current UDO "only provides development standards for Detached Accessory Dwelling Units (DADUs)." If you want an attached ADU, contact the ADU Customer Support team first. Check your deed and HOA rules too; North Carolina's ADU law says it does not override private covenants. [1][2][3]

Size, setbacks and placement

Size. For an ADU in an accessory building, the heated floor area can't exceed 600 heated square feet or 70% of the main home's total floor area, whichever is greater, and "in no case shall the ADU exceed 1,000 heated square feet." An ADU doesn't count toward the UDO's cap on the total size of other accessory buildings on a lot.

Setbacks. A detached ADU follows the UDO's general rules for accessory structures:

• It can't go in the established front or corner side setback along a street.
• In an established side or rear setback, it must be at least 3 feet from the lot line.
• If it is 24 feet tall or more, it must be at least 15 feet from the rear lot line and meet the district's required side setback.
• In residential districts, it must be at least 5 feet from the main house. A breezeway up to 8 feet wide may sit in that gap.

An accessory building can't be built before the main home has a building permit or zoning approval. Your exact limits depend on your lot, so confirm them with the ADU support team. [1][2][4]

Parking and driveways

The UDO's ADU rules don't set a parking requirement. They do say an ADU "shall not be served by a driveway separate from that serving the principal dwelling." On a corner lot, a through lot between two parallel local streets, or a lot on an alley, you may add a separate driveway from the side street, the rear street or the alley.

Under North Carolina's new ADU law, from January 15, 2027 Charlotte can't set minimum parking requirements or other parking restrictions for ADUs. [1][3]

What changes with the 2027 state law

Session Law 2026-59 adds G.S. 160D-917, which covers cities of 50,000 or more outside the coastal area. The state demographer estimated Charlotte's population at 959,079 on July 1, 2025. The law applies to ADU permit applications filed on or after January 15, 2027, and the city must adopt rules to carry it out by July 1, 2027.

Under the state law, Charlotte must allow at least one ADU with each single-family detached home in residential areas that allow those homes. It can't set a maximum ADU size below 800 square feet or above 1,000 square feet, can't charge more than for a similar single-family home permit, and can't set minimum parking requirements or other parking restrictions. It may still require a setback of 10 feet (or the zone's general setback, if that is less), a side or rear location, and an ADU smaller than the main house.

Charlotte's current size rule (600 square feet or 70% of the main home, whichever is greater) can work out to a cap below 800 square feet on a small house, and the UDO's 15-foot rear setback for accessory buildings 24 feet tall or more is larger than 10 feet. The city's ADU page doesn't mention the state law yet, so ask the ADU support team which rules will apply when you apply. See our North Carolina ADU law page. [1][2][3][4][5]

Permits, fees and timeline

ADUs need permits from both the city and the county. The City of Charlotte issues the LDIRL permit for zoning, stormwater and tree standards. Mecklenburg County Code Enforcement issues the building permit for the structure, electrical, plumbing and mechanical work. The city says, "The City LDIRL permit must be approved prior to County Building Permit approval."

City fees are due before reviews begin. For county permit fees, see the county's LUESA fee ordinance or call 980-314-2633.

The county reviews all new ADUs and conversions of existing space into an ADU. Its goal is to review plans for one- and two-family dwellings within an average of seven days of plan acceptance, though times vary with volume. State law requires a local government's first review of residential building plans within 15 business days, with partial fee refunds after 20 business days.

Since August 11, 2026, state law also requires local governments to post their fee schedules online and give you a fee estimate within 10 business days of a complete application. See our ADU cost guide for budgeting. [2][3][6][7][8]

Garage and accessory building conversions

You can put an ADU inside an existing accessory building, such as a detached garage, if it meets the same size limit and accessory structure rules. The city says converting an accessory structure means "additional permitting with Charlotte Water and Duke Energy is required." Charlotte Water can confirm whether a water and sewer connection is available at your address, and a licensed plumber and electrician can tell you whether the ADU can use the existing lines.

Mecklenburg County reviews plans for any conversion of existing space into an ADU and for garages that include living space. See our garage conversion guide. [1][2][6]

Renting it out and selling

The city says, "Property owners may choose to rent out their ADU if they wish." You can't sell the ADU separately: the UDO requires the ADU and the main home to be under the same ownership.

Before anyone lives in or rents the ADU, it needs a Certificate of Occupancy. [1][2]

Financial help

The city's Queen City ADU Program offered forgivable financing of "Up to $80,000 (or 50% of project costs, whichever is less)" for detached ADUs rented to income-qualified tenants at or below 80% of area median income. Applications closed on October 31, 2025, and the program is not accepting new applications. You can fill out the Queen City ADU Interest Form on the city's ADU page to hear about updates.

For other ways to pay for an ADU, see our ADU financing guide. [2]

Permit steps in Charlotte

1. Check your lot

   Run your address through the city's MyADU eligibility tool. If it says feasibility is not likely, contact the ADU support team before you go further. [2]

2. Talk to the ADU support team

   Book a 30-minute phone or Teams call through the city's ADU page, or email MyADU@charlottenc.gov. The city says to expect a reply in 2 to 3 business days. [2]

3. Pick a design

   You can review the city's UDO-compliant ADU designs and submit the ADU design and development plans request form for an unstamped plan set. The plan set is not a permit, and you still need a professional survey or site plan. [2]

4. Get an address and prepare documents

   Request a new address for the ADU through Mecklenburg County address assignment. Prepare a site plan with lot lines, setbacks, driveways, trees, easements and stormwater features, plus building elevations and the city's ADU Declaration Form. [2]

5. Apply for the city LDIRL permit

   The City of Charlotte's Land Development Individual Residential Lot (LDIRL) review covers zoning, stormwater and trees. Fees are due before reviews begin. [2]

6. Apply for the county building permit

   Once the LDIRL permit is approved, apply for the building permit through your Mecklenburg County contractor or homeowner account, choosing the RTAC plan review path. See the county's residential plan review page. [2][6]

7. Build, pass inspections and get a Certificate of Occupancy

   Schedule inspections as you build. A Certificate of Occupancy is required before anyone can live in or rent the ADU. [2]

Pre-approved and sample plans

• UDO-compliant ADU designs (ADU Design & Development Plans)

  City-reviewed ADU designs with renderings and floor plans; request an unstamped plan set, which the city says may support expedited county building permit review through the master plan process. [2]

Who to call

• City of Charlotte ADU Customer Support

  Eligibility, zoning questions and attached ADUs; email MyADU@charlottenc.gov

  [2]

• Mecklenburg County Code Enforcement (LUESA)

  Building permits, plan review, inspections and county permit fees, Monday to Friday 8 a.m. to 5 p.m.

  980-314-2633

  2145 Suttle Ave., Charlotte, NC 28208

  [2][7]

Questions people ask