Oklahoma City ADU permit requirements
Last reviewed: June 22, 2026
Quick answer
Permitting an accessory dwelling unit (ADU) in Oklahoma City, Oklahoma means pulling a building permit from the local authority that issues it. ArchPermit tracks 14 source-cited requirements (9 required, the rest conditional) for this jurisdiction. Submittals go through OKC Citizen Access (Accela). 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 Oklahoma City. Every item links to its authoritative source; items that vary are flagged to confirm locally.
ADUs are a CONDITIONAL use (Ordinance 27,847 / § 59-9350.2.1), not by-right, allowed only where (A) the site is in the Urban Medium (UM) or Urban High (UH) planokc Land Use Typology Area AND (B) the site is zoned R-1, or is zoned NC/R-2/R-3/R-4 and occupied by a single-family structure. Prohibited in a Historic Landmark Overlay (HL/HP) and in SPUD/PUDs where the ADU use wasn't permitted. One ADU per parcel, ≤950 sf, and it cannot be sold separately. A building permit is required; a detached ADU is submitted under the Residential New Construction checklist. Owner-occupancy attaches only if the ADU is used as a home-share/short-term rental (which needs a Board of Adjustment Special Exception + Home Sharing License). A temporary neighbor-notice sign must be posted within 30 days of filing.
- Building Permit Applicationrequired
Property address & legal description, owner/applicant contact, estimated cost, and floor area (ADU must be ≤950 sf), submitted via OKC Citizen Access.
source · reviewed 2026-06-22 - Exterior Elevation Detailsrequired
Elevations showing materials, color, and style (ADU materials must meet the residential codes + district design standards).
source · reviewed 2026-06-22 - Floor Plans (dimensioned)required
Walls, rooms, doors/windows with dimensions; cabinetry; fixtures; hot-water tank; and smoke + combo smoke/CO detector placement.
source · reviewed 2026-06-22 - Footing & Foundation Plansrequired
Footing/foundation plans and details.
source · reviewed 2026-06-22 - Licensed Contractor (insured) or Notarized Homeowner Exemptionrequired
A licensed, insured contractor must submit, unless the homeowner builds it and files a notarized homeowner insurance-exemption form.
source · reviewed 2026-06-22 - PDF Formatting / Plan-Set Standardsrequired
Flattened/compressed PDF (Acrobat v9+), prescribed file naming, ≤100 MB, bookmarks per sheet, index, cover/page stamp space, drawn to scale.
source · reviewed 2026-06-22 - Site Plan (to scale, dimensioned)required
Dimensioned property lines, easements, right-of-way, north arrow; proposed ADU location with distances to each property line (rear-yard placement + zoning setbacks).
source · reviewed 2026-06-22 - Temporary Neighbor-Notice Signrequired
The owner posts a temporary sign (address, permit #, Citizen Access QR/URL) within 30 days of filing, kept until the Certificate of Occupancy issues (§ 59-9350.2.1.M).
source · reviewed 2026-06-22 - Water & Wastewater Connection Approval (Utilities Dept.)required
The ADU must have water/wastewater connections as approved by the OKC Utilities Department (§ 59-9350.2.1.H).
source · reviewed 2026-06-22 - Flood Elevationconditional
Required if located within/near flood-prone areas.
source · reviewed 2026-06-22 - Oklahoma-Licensed Engineer Designconditional
Required for pier/grade-beam or post-tension foundations, structural members spanning over 30 ft, or rated wall assemblies.
source · reviewed 2026-06-22 - Portal-Frame / Braced-Wall-Line Drawingsconditional
Portal frames at bay windows/garage doors and braced-wall-line drawings when required.
source · reviewed 2026-06-22 - Special Exception + Home Sharing License (STR only)conditional
Only if the ADU will be a home-share/short-term rental: a Board of Adjustment Special Exception (mailed notice + public hearing) and a Home Sharing License, separate from the building permit.
source · reviewed 2026-06-22 - Well/Septic Location + DEQ Perc Testconditional
Required where the lot is served by well/septic. Show the well & septic location and provide the Oklahoma DEQ percolation test.
source · reviewed 2026-06-22
Oklahoma City ADU permit questions
- Do I need a permit to build an ADU in Oklahoma City?
- Yes. An accessory dwelling unit (ADU) in Oklahoma City requires a building permit. ArchPermit tracks 14 cited requirements for this jurisdiction (9 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 Oklahoma City?
- Core required items include: Building Permit Application; Exterior Elevation Details; Floor Plans (dimensioned); Footing & Foundation Plans; Licensed Contractor (insured) or Notarized Homeowner Exemption; PDF Formatting / Plan-Set Standards, plus 3 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 Oklahoma City?
- Oklahoma City accepts permit submittals via OKC Citizen Access (Accela). ArchPermit prepares a draft package you can submit there after a licensed architect reviews and seals it.