ADU Rules in Tulsa, Oklahoma

Tulsa, Oklahoma's second-largest city, regulates Accessory Dwelling Units (ADUs) through the City of Tulsa Zoning Code. Oklahoma has no statewide ADU preemption law, so Tulsa's local ordinances fully govern ADU eligibility, design, and permitting on your property.

What Is an ADU?

An ADU is a secondary, self-contained residential unit on the same lot as a primary home. In Tulsa, this can take the form of a detached backyard cottage, an attached addition, a garage conversion, or an interior basement or upper-floor unit.

Permitted ADU Types

Tulsa's residential zoning districts (RS-1 through RS-4 and others) may permit:

• Detached ADUs — freestanding structures on the same lot as the primary dwelling
• Attached ADUs — living space added onto or integrated into the primary structure
• Garage conversions — converting a detached or attached garage into a habitable unit
• Interior conversions — converting existing interior space (e.g., basement, bonus room) into a separate dwelling

Your specific zoning district and lot characteristics determine what is allowed. Confirm eligibility with Tulsa Planning and Development before proceeding.

Size and Setback Guidelines

• Maximum size: Commonly capped relative to the primary dwelling's square footage or set at an absolute maximum (verify current limits with the zoning code)
• Rear setback: Typically 5 feet minimum from the rear property line
• Side setback: Typically 3–5 feet from interior side property lines
• Height: Generally limited to one story for detached ADUs; attached ADUs should not exceed the primary dwelling's height
• Lot coverage: Combined primary and ADU footprint must not exceed the zone's maximum lot coverage

Special Overlay Considerations

Arkansas River Flood Zones: The 2019 Arkansas River flood was one of Tulsa's most severe in recent memory, driven by heavy rainfall and Keystone Dam operations. Neighborhoods in west and south Tulsa near the river carry elevated flood risk. FEMA flood zone maps identify Special Flood Hazard Areas (SFHAs) where new construction — including ADUs — must meet floodplain management standards. Elevated foundations, flood vents, and elevation certificates may be required.

Tornado Risk: Tulsa sits in Tornado Alley. All new residential construction, including ADUs, should include access to a storm shelter or FEMA-rated safe room. Verify current requirements with the City of Tulsa Building Division.

McGirt v. Oklahoma Context: The 2020 U.S. Supreme Court ruling in McGirt v. Oklahoma recognized large portions of eastern Oklahoma — including much of Tulsa city limits — as within the Creek (Muscogee) Nation's treaty reservation. Subsequent rulings extended this to other tribal nations. For most civilian property owners in Tulsa, city and county land-use regulations continue to apply. However, properties held in tribal trust may be subject to tribal jurisdiction; consult the relevant tribal nation's planning department if this applies to your land.

Historic Districts: The Greenwood District and other Tulsa historic neighborhoods may have additional design review requirements for new construction. Check with the Tulsa Historic Preservation Office if your property is in a designated historic overlay.

Permit Process

1. Check zoning: Use the Tulsa GIS map or contact Planning and Development to confirm your property's zoning district and any overlays
2. Pre-application: Request a pre-application meeting for guidance on complex projects
3. Prepare construction documents: Engage a licensed architect or designer to prepare plans meeting the Oklahoma Uniform Building Code
4. Submit application: File a building permit application with the City of Tulsa Development Services, 175 E. 2nd St., Suite 560, Tulsa, OK 74103
5. Plan review: Staff review for zoning, floodplain, building code, and historic overlay compliance
6. Permit issuance and fees: Pay permit fees and receive your permit
7. Inspections: Schedule required inspections during construction
8. Certificate of occupancy: Obtain a CO before the unit is occupied

Contact Information

City of Tulsa Planning and Development 175 E. 2nd St., Suite 560 Tulsa, OK 74103 Phone: (918) 596-9456 Website: cityoftulsa.org/government/departments/planning-and-development/

Disclaimer: ADU regulations change frequently. Always verify current requirements directly with the City of Tulsa Planning and Development Department and review the current zoning code before starting any project. This page is for informational purposes only and does not constitute legal or planning advice.