ADU Rules in Omaha, Nebraska

No Statewide ADU Law — Local Zoning Controls

Nebraska has not passed statewide legislation preempting local ADU regulations, unlike some other states. In Omaha, accessory dwelling unit rules are set entirely by the City of Omaha Zoning Ordinance (Chapter 55). This means the specific permissions, size limits, and design standards depend on your property's zoning district. Always verify current rules with the Omaha Planning Department before beginning any project.

Zoning Districts and ADU Permissions

Omaha's residential zoning includes several districts — from lower-density R1 (Single Family Residential) through higher-density classifications. ADUs, sometimes called secondary dwelling units or carriage houses, are generally permitted in residential districts as accessory uses, but the rules differ by district. In lower-density R1 zones, regulations tend to be more restrictive regarding lot coverage and setbacks, while mixed-residential districts may allow more flexibility.

Properties near the University of Nebraska Omaha (UNO) corridor and in neighborhoods such as Dundee, Benson, or Midtown may fall under overlay zoning or historic district guidelines that add additional design review requirements.

Permitted ADU Types

Omaha's code generally allows:

• Attached ADUs: An addition to the primary residence with a separate entrance
• Detached ADUs: A freestanding structure in the rear or side yard (subject to lot coverage limits)
• Garage conversions: Converting an existing detached garage into living space

Basement conversions (interior ADUs) may also be permitted where the structure meets egress, ceiling height, and habitability requirements under the Nebraska Residential Building Code.

Size and Setback Standards

Typical standards under Omaha's zoning (verify current code):

• Maximum ADU size: Often tied to a percentage of the primary dwelling's square footage or a hard cap (commonly 600–900 sq ft depending on district)
• Rear setback: Generally 5 feet minimum from the rear property line for detached structures
• Side setback: Typically 5 feet minimum
• Lot coverage: Total impervious or structural coverage limits apply; adding an ADU counts toward this

Missouri River Flood Zone Considerations

Portions of Omaha near the Missouri River waterfront are in FEMA Special Flood Hazard Areas. The catastrophic 2011 Missouri River flooding demonstrated the severity of flood risk in this region. If your property is in a flood zone:

• A floodplain development permit is required in addition to a building permit
• New structures may need to be elevated above the Base Flood Elevation (BFE)
• Contact Omaha's Floodplain Administrator through the Public Works Department

Permit Process

1. Verify your property's zoning at the Omaha Zoning Map portal
2. Submit a building permit application with site plan, floor plan, and elevation drawings
3. Pay applicable permit fees (based on construction valuation)
4. Schedule inspections: framing, electrical, plumbing, final
5. Obtain certificate of occupancy before renting or occupying the ADU

Contact Information

City of Omaha Planning Department 1819 Farnam Street, Suite 1100 Omaha, NE 68183 Phone: (402) 444-5150 Website: cityofomaha.org/planning

Omaha Building and Safety Division Phone: (402) 444-5350

Disclaimer: Zoning regulations change. Always verify current ADU rules with the City of Omaha Planning Department or a licensed Nebraska architect or contractor before committing to a project. This page is for informational purposes only and does not constitute legal or zoning advice.