Charlotte ADU permit requirements
Last reviewed: June 22, 2026
Quick answer
Permitting an accessory dwelling unit (ADU) in Charlotte, North Carolina means pulling a building permit from the local authority that issues it. ArchPermit tracks 13 source-cited requirements (10 required, the rest conditional) for this jurisdiction. Submittals go through City LDIRL (Accela) + Mecklenburg County WebPermit / RTAC. These requirements were last reviewed June 22, 2026; confirm the exact forms and fees with the local permitting authority.
A source-cited checklist of what an ADU (accessory dwelling unit) permit package needs in City of Charlotte. Every item links to its authoritative source; items that vary are flagged to confirm locally.
Charlotte splits review: the City of Charlotte LDIRL zoning permit (Accela: zoning, stormwater, urban-forestry) must be approved before Mecklenburg County issues the building permit (NC building-code plan review via County WebPermit / RTAC). ADUs are allowed accessory to a single-family dwelling (or a duplex not on sublots) in districts where the principal use is allowed; one ADU per lot, same ownership, clearly subordinate. An accessory-structure ADU is capped at 50% of the principal dwelling's floor area and 1,000 heated sf (UDO §15.6). Same ownership is required, but no owner-occupancy (must-live-on-site) mandate was found.
- Accessory Structure / ADU Declaration Formrequired
Signed City form (Rev. March 2025) declaring whether the accessory structure contains an ADU; recites the UDO §15.6 ADU standards.
source · reviewed 2026-06-22 - Completed Electronic Permit Application (all trades)required
County electronic permit application, complete and including all associated trade contractors (RTAC Plan Review Path).
source · reviewed 2026-06-22 - Construction / Building-Code Plans (County combined PDF)required
One combined PDF (≤40 MB), legible, to scale on min 17×11 sheets, with CAD sheet naming, bookmarked, and designer/architect/engineer contact info.
source · reviewed 2026-06-22 - Erosion-Control / Land-Disturbance Formrequiredverify locally
The County requires the necessary zoning and erosion-control forms uploaded with the application (exact form name to confirm).
source · reviewed 2026-06-22 - GIS Addressing Documentation (new ADU address)required
A new address must be assigned to the ADU via Mecklenburg County GIS; addressing documentation is a required ADU submittal.
source · reviewed 2026-06-22 - Heated/Unheated Square-Footage Labelingrequired
Drawings must identify heated and unheated square footage of each story plus a project total (feeds the ADU 1,000-sf / 50% size check).
source · reviewed 2026-06-22 - Plans with Building Elevationsrequired
Architectural plans including building elevations for the ADU.
source · reviewed 2026-06-22 - Recorded Plat (infill ADU)requiredverify locally
For an ADU on an existing infill lot, the lot must be shown on a plat recorded at the Register of Deeds before LDIRL/County review (confirm whether a copy must be uploaded).
source · reviewed 2026-06-22 - Site Plan (professionally prepared)required
Scaled, professionally prepared site plan/survey (not hand-drawn) showing vicinity map, streets, building-to-property-line distances, lot area, setbacks, building coverage, driveway/sidewalk, trees, buffers, and existing storm drainage.
source · reviewed 2026-06-22 - Stormwater Plan Itemsrequired
The City stormwater review requires the site plan to show address/PIN, dimensioned property/right-of-way lines, easements, existing structures, lot area, proposed construction, land disturbance, and minor drainage routing.
source · reviewed 2026-06-22 - Built-Upon-Area (BUA) Tabulation / PCSR Summaryconditional
Required where Post-Construction Stormwater Regs or Water Supply Watershed Protection apply (≥5,000 sf BUA, ≥1 acre disturbance, or watershed lots).
source · reviewed 2026-06-22 - Sealed Flood / Stormwater-Protection Studyconditional
Required for properties subject to flooding: sealed PE design calcs + grading plans; a revised plat may be required before occupancy.
source · reviewed 2026-06-22 - Urban Forestry / Tree-Preservation Submittalconditional
Required if code-protected, Heritage, right-of-way, or Tree-Save trees exist on the lot (City tree checklists, Tier 1/2/3).
source · reviewed 2026-06-22
Charlotte ADU permit questions
- Do I need a permit to build an ADU in Charlotte?
- Yes. An accessory dwelling unit (ADU) in Charlotte requires a building permit. ArchPermit tracks 13 cited requirements for this jurisdiction (10 required, the rest conditional). Always confirm the exact forms, fees, and code edition with the local permitting authority that issues the permit.
- What does an ADU permit package require in Charlotte?
- Core required items include: Accessory Structure / ADU Declaration Form; Completed Electronic Permit Application (all trades); Construction / Building-Code Plans (County combined PDF); Erosion-Control / Land-Disturbance Form; GIS Addressing Documentation (new ADU address); Heated/Unheated Square-Footage Labeling, plus 4 more. Each requirement links to its authoritative source, and nothing is permit-ready until an independent licensed professional reviews and seals it.
- How are ADU permits submitted in Charlotte?
- Charlotte accepts permit submittals via City LDIRL (Accela) + Mecklenburg County WebPermit / RTAC. ArchPermit prepares a draft package you can submit there after a licensed architect reviews and seals it.