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Zoning Guide

Duncan Zoning & Land Use Guide

Data-only stub — facts unverified locally. Confirm with the planning department before relying on details.
Last updated: Verified:

What we have on file vs. what to verify locally

We don't have editor-verified zoning prose for Duncanyet. Here's the structured data we do have, and the highest-leverage steps to confirm specifics for your parcel.

What we have on file

Population:
22,774
County:
Stephens County
State building code:
No mandatory statewide code for residential; local adoption(statewide default)
State ADU law:
No statewide override; local rules apply
FEMA flood map:
Search flood zones
Planning department:
City of Duncan Planning Department
Municipal code:
View code online
Zoning map:
View city zoning map

Verify these locally

  • Call the City of Duncan Planning Department: (580) 252-0256
  • Search the municipal code for the chapter that covers your zoning district and proposed use.
  • Use the city zoning map to look up your parcel's zoning designation before applying for a permit.
  • Check FEMA flood zone for your parcel — flood-zone status changes setbacks, foundation requirements, and insurance.
  • Check your HOA CC&Rs and recorded deed restrictions — they are common in Duncan and frequently restrict ADUs, fences, and exterior changes beyond what zoning allows.

Key Zoning Facts

Planning Department
City of Duncan Planning Department(580) 252-0256
Building Code Edition
2012 IBC (locally adopted)
ADUs Allowed
No

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

State — Oklahoma

  • Building Code: No mandatory statewide residential code; local adoption
View Oklahoma zoning overview

County — Stephens County

    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.

    Statewide Context (Oklahoma)

    Local data for Duncan is limited. The following state-level facts apply across Oklahoma and are inherited by this page until city-specific details are verified.

    State Building Code
    No mandatory statewide code for residential; local adoption
    State ADU Preemption
    No statewide override
    Coastal Zone
    No
    Wildfire Zones
    No

    ADU Rules in Duncan

    ADUs:Not Allowed
    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
    Full ADU rules for Duncan →

    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 →

    Official Sources

    City-specific

    City of Duncan Planning Departmentduncanok.govOfficial sourceDuncan Municipal Codelibrary.municode.comOfficial source