ADU Rules in Minot, North Dakota

Minot is the county seat of Ward County and is often called the "Magic City" — a nickname earned from its remarkably fast growth after the railroad arrived in 1886. Today Minot is a regional hub for northwest North Dakota, serving the oil and agricultural industries and anchored by Minot State University. Minot Air Force Base, one of the nation's premier strategic bomber/missile bases, lies north of the city.

No Statewide ADU Law — Local Zoning Controls

North Dakota has not enacted statewide ADU preemption legislation. All rules governing Accessory Dwelling Units (ADUs) in Minot are established exclusively by the City of Minot Zoning Ordinance. There is no state mandate requiring the city to allow ADUs or limiting local authority to regulate them.

ADU Types Potentially Allowed

Minot's zoning code may permit these ADU configurations in residential districts:

• Detached ADUs — a standalone accessory structure on the same lot as the main home
• Attached ADUs — living space added to the primary dwelling, sharing at least one wall
• Garage conversions — converting an existing garage (attached or detached) into a dwelling unit
• Basement/interior ADUs — a self-contained unit within the existing footprint of the primary structure

Specific allowances depend on the zoning district designation for your parcel. The Planning Department can confirm which ADU types are permitted in your zone.

Typical Development Standards

ADUs in Minot are generally subject to requirements such as:

• Minimum lot area — typically required before an ADU is allowed on a parcel
• Maximum ADU size — often capped as a percentage of the primary dwelling's floor area or an absolute maximum (e.g., 800 sq ft)
• Setbacks — rear and side yard setbacks apply; detached structures usually require at least 5 feet from property lines
• Height limits — detached ADUs are commonly limited to one story or a maximum height consistent with accessory structure limits
• Parking — one additional off-street parking space is often required for ADU occupants
• Utility connections — separate or shared utility metering per city requirements

Confirm all current standards with the City of Minot Planning Department before designing or permitting an ADU.

The 2011 Souris River Flood

The summer 2011 Souris River (Mouse River) flood was the most catastrophic flood in Minot's history. The Souris River crested roughly 5 feet above the previous record, overtopping and breaching flood protection structures. More than 11,000 Minot residents were displaced, and thousands of homes were damaged or destroyed, representing a significant portion of the city's housing stock.

In the aftermath, FEMA undertook extensive floodplain remapping for Minot and Ward County. Key implications for ADU construction near the Souris River:

• Current flood zone maps may differ significantly from pre-2011 designations — many properties near the river were placed into or upgraded within Special Flood Hazard Areas (SFHAs)
• Construction in an SFHA requires a floodplain development permit
• Finished floor elevations must meet or exceed the Base Flood Elevation (BFE)
• Additional foundation and fill requirements apply
• Flood insurance may be required

Always verify your parcel's current FEMA flood zone designation via the FEMA Flood Map Service Center or the City Engineer's office, particularly if you have not checked since 2011–2012.

Minot Air Force Base — AICUZ Overlay

Minot AFB is an active USAF base located approximately 13 miles north of downtown Minot. The base hosts B-52 bombers and ICBM facilities, and its flight operations create AICUZ (Air Installation Compatible Use Zone) considerations:

• Aircraft Accident Potential Zones (APZs): Areas near runways where new residential construction may be restricted or prohibited
• Noise Contour Zones: Properties within high-noise areas (typically DNL 65 dB and above) are considered less compatible with residential uses
• Some city land north of Minot may fall within these overlay areas

Contact the City of Minot Planning Department or Minot AFB Civil Engineering to determine if your property is within any AICUZ zone before planning an ADU.

Extreme Climate Requirements

Minot is known for brutally cold winters, with temperatures regularly reaching −25°F to −35°F. All ADU construction must comply with North Dakota building codes that address:

• Foundation depth: Foundations must extend well below the frost line (42–60 inches or more)
• Thermal performance: High R-value insulation required for walls, roofs, and foundations
• Heating systems: Mechanical systems must be designed for extreme cold weather operation

Permit Process

1. Verify your property's zoning district and ADU eligibility with the Planning Department
2. Check flood zone status (FEMA FIRMs) and AICUZ applicability for your parcel
3. Obtain any required zoning approvals or conditional use permits
4. Submit a building permit application with complete construction plans
5. Schedule all required inspections throughout the construction process

Contact Information

City of Minot Planning Department

• Website: minotnd.org/departments/planning
• Address: City Hall, 515 2nd Street SW, Minot, ND 58701
• Phone: (701) 857-4100

Disclaimer: Zoning regulations change frequently. The information on this page is provided for general informational purposes only and may not reflect the most current rules. Always verify ADU requirements directly with the City of Minot Planning Department and consult a licensed architect or contractor before beginning any project.