Duncan Zoning & Land Use Guide
Key Zoning Facts
Duncan Zoning Overview
Duncan is the county seat of Stephens County in south-central Oklahoma. The city was historically a major center for the oil and gas industry and served as the headquarters for Halliburton before the company relocated. Duncan's economy continues to rely on energy services, manufacturing, and agriculture. The city is a regional commercial center for the surrounding rural area.
The zoning code is managed by the Planning Department and reflects Duncan's character as a mid-sized Oklahoma city. Development patterns include a traditional downtown, established residential neighborhoods, and highway commercial corridors along US-81 and the H.E. Bailey Turnpike corridor.
Key Zoning Districts
Duncan's zoning includes residential districts (R-1 through R-3), commercial districts (C-1 through C-3), and industrial zones. The downtown area has commercial zoning that supports retail and office uses, while highway corridors accommodate larger-scale commercial development.
ADU Regulations
Duncan does not have specific ADU provisions. Oklahoma has no statewide ADU mandate. Contact the Planning Department for guidance.
Development Process
The Planning Department reviews development applications. Zoning changes go before the Planning Commission and City Council. Building permits are processed through the building inspection office.
Regulatory Layers That Apply in Duncan
Your property is subject to ALL of these regulatory layers. Each one can impose additional requirements beyond the others.
Federal
- FEMA Flood Zones: Applicable
- View FEMA Flood Map
State — Oklahoma
- Building Code: No mandatory statewide residential code; local adoption
County — Stephens County
- Role: Property records, tax assessment, unincorporated area planning
City / Municipal
The city's zoning ordinance, building codes, and local permits form the primary layer of land-use regulation for your property.
Overlay Districts
No overlay districts identified.
Private Restrictions
- HOA / CC&Rs common: Yes
- Check HOA CC&Rs for additional restrictions.
Primary Zoning Districts
- Min Lot
- 7,000 sq ft
- Max Height
- 35 ft
- Front Setback
- 25 ft
- Side Setback
- 5 ft
- Rear Setback
- 20 ft
- Min Lot
- 3,000 sq ft per unit
- Max Height
- 40 ft
- Front Setback
- 25 ft
- Side Setback
- 10 ft
- Rear Setback
- 20 ft
- Min Lot
- None
- Max Height
- 40 ft
- Front Setback
- 15 ft
- Side Setback
- 0 ft
- Rear Setback
- 15 ft
ADU Rules in Duncan
- Max Size
- N/A
- Max Height
- N/A
- Rear Setback
- N/A
- Side Setback
- N/A
- Parking
- N/A
- Owner Occupancy
- N/A
- Permit Timeline
- N/A
Permit Costs & Timelines
Permit Costs & Timelines
Specific permit fee schedules for Duncan are available from the local planning department. Fees vary based on project type, scope, and valuation.
Check Duncan permit fees →