ADU Rules in Oklahoma City, OK (2026)
ADU rules, permit requirements, size limits, and fees for Oklahoma City, OK. Source-cited from official municipal code.
Yes, ADUs are allowed in Oklahoma City, OK.
Oklahoma City, OK 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 Oklahoma City, the Oklahoma City Planning and Development Services handles ADU permit applications. Below you will find the current size limits, setbacks, fees, and timeline for building an ADU in Oklahoma City.
ADU Size Limits
ADU Size Limits in Oklahoma City: Detached ADU: up to 800 sq ft (max height: 24 feet). Attached ADU: 50% of primary dwelling floor area. Oklahoma City Zoning Code accessory dwelling unit provisions. Detached ADUs limited to 800 sqft. JADU is a California-specific concept not applicable in Oklahoma.
| Type | Max Size | Max Height |
|---|---|---|
| Detached ADU | 800 sq ft | 24 feet |
| Attached ADU | 50% of primary dwelling floor area | Per zone height limit |
Permit Fees
ADU Permit Fees in Oklahoma City: Plan check fee: $150–$800. Building permit fee: Based on construction value — typically $600–$2,500. Impact fees: Oklahoma City charges utility connection fees; impact fees less comprehensive than Texas or California cities. School fees: None or N/A. Total estimated permit cost: $1,500–$6,000 total fees. Oklahoma City's permit fees are modest compared to coastal cities. Water and wastewater connection fees apply for independent plumbing connections.
| Fee Type | Amount |
|---|---|
| Plan Check | $150–$800 |
| Building Permit | Based on construction value — typically $600–$2,500 |
| Impact Fees | Oklahoma City charges utility connection fees; impact fees less comprehensive than Texas or California cities |
| School Fees | None |
| Total Estimate | $1,500–$6,000 total fees |
Permit Timeline
Oklahoma City ADU Permit Timeline: OKC Planning and Development Services permit: typically 3-6 weeks for residential permits. Oklahoma City uses an online permit portal. Construction typically 4-12 months. Apply through the Oklahoma City Planning and Development Services online permit portal. Phone: (405) 297-2623.
Setback Requirements
ADU Setback Requirements in Oklahoma City: Front setback: follows zone standard. Side setback: 5 feet. Rear setback: 5 feet. Detached ADUs in Oklahoma City must maintain minimum 5 ft rear and side setbacks. Oklahoma City Zoning Code accessory structure provisions.
Parking Requirements
Parking Requirements: 1 parking space required per ADU. Oklahoma City is auto-dependent — parking waiver provisions are limited. On-street parking not counted toward requirement.
Restrictions & Requirements
- ADU must be on same lot as primary dwelling
- Minimum lot size requirements by zone (R-1 typically requires 6,000 sqft minimum)
- ADU cannot be separately sold from primary lot
- Lot coverage limits apply — ADU contributes to total coverage
- Short-term rental of ADU requires STR license from OKC
- ADU must comply with Oklahoma residential building code (IRC as adopted)
How Many ADUs Are Allowed?
Number of ADUs Allowed in Oklahoma City: Single-family lots: 1 ADU per single-family lot. Multifamily properties: Varies by zone; additional units may be allowed by right in R-3 through R-5. Oklahoma City allows one accessory dwelling unit per single-family lot in qualifying R-1 and R-2 residential zones. Higher-density zones permit additional units.
Single-Family Lots
1 ADU per single-family lot
Multifamily Properties
Varies by zone; additional units may be allowed by right in R-3 through R-5
Historic District Considerations
Historic District Requirements: Oklahoma City has 8 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. Oklahoma City Heritage Hills, Mesta Park, Crown Heights, Automobile Alley, and portions of Bricktown are National Register Historic Districts or locally designated. Oklahoma City Historic Preservation Commission reviews exterior changes to contributing structures in designated districts. Certificate of Appropriateness may be required for visible modifications. Look up historic district boundaries at: https://www.okc.gov/departments/planning/preservation
Frequently Asked Questions
Can I build an ADU in Oklahoma City?
Yes. Oklahoma City, OK allows accessory dwelling units. On a single-family lot you can build 1 ADU per single-family lot.
How big can an ADU be in Oklahoma City?
The maximum size for a detached ADU in Oklahoma City is 800 square feet.
How long does it take to get an ADU permit in Oklahoma City?
The typical ADU permit timeline in Oklahoma City is OKC Planning and Development Services permit: typically 3-6 weeks for residential permits. Oklahoma City uses an online permit portal. Construction typically 4-12 months.. Total estimated permit fees are $1,500–$6,000 total fees.
Do I need extra parking for an ADU in Oklahoma City?
No, Oklahoma City does not require additional parking for ADUs.
Do I have to live on-site to have an ADU in Oklahoma City?
No, owner-occupancy is not required for ADUs in Oklahoma City.
Source: Oklahoma City Zoning Code — Accessory Dwelling Unit provisions. Last verified April 6, 2026. View source