ADU Rules in West Fargo, North Dakota

West Fargo is one of North Dakota's fastest-growing cities, situated in Cass County immediately west of Fargo. Despite sharing a name and a border with Fargo, West Fargo is a completely independent incorporated city with its own municipal government, zoning ordinance, and planning department. The two cities are separate jurisdictions — this page covers West Fargo only.

The Sheyenne River runs through West Fargo, and the city has seen rapid suburban growth driven by Fargo's expanding metro economy. New residential development is ongoing throughout West Fargo, and accessory dwelling questions arise frequently as neighborhoods mature.

No Statewide ADU Law — Local Zoning Controls

North Dakota has not passed statewide legislation preempting or standardizing ADU regulations. All rules governing Accessory Dwelling Units (ADUs) in West Fargo are set exclusively by the City of West Fargo Zoning Ordinance. There is no state mandate requiring West Fargo to allow ADUs or limiting the city's ability to regulate them.

ADU Types Potentially Allowed

West Fargo's zoning code may allow the following ADU types depending on the residential district:

• Detached ADUs — a separate accessory structure (e.g., backyard cottage, coach house) on the same lot
• Attached ADUs — living space added to the primary home sharing at least one wall
• Garage conversions — converting an attached or detached garage into a residential unit
• Basement/interior ADUs — a self-contained unit within the existing structure's interior

Because West Fargo has been rapidly developing new subdivisions, some zoning districts may have specific standards tailored to newer construction patterns. Confirm what ADU types are allowed in your zone directly with the West Fargo Planning Department.

Typical Development Standards

ADUs in West Fargo are generally subject to standards including:

• Minimum lot size — a minimum lot area threshold is typically required before an ADU is permitted
• Maximum ADU size — often limited as a percentage of the primary dwelling floor area or an absolute cap (e.g., 800–1,000 sq ft)
• Setbacks — detached ADUs in rear yards typically require at least 5 feet from rear and side property lines; verify current setback requirements for your zone
• Height limits — detached ADUs commonly limited to one story or a maximum height consistent with accessory structure limits
• Parking — one additional off-street parking space may be required for the ADU
• Utilities — compliance with city water, sewer, and electrical requirements for the additional unit

All dimensions and thresholds should be confirmed with the City of West Fargo Planning Department, as standards may have evolved with recent code updates.

Sheyenne River and Flood Zone Considerations

The Sheyenne River flows through West Fargo and empties into the Red River south of Fargo. The Sheyenne River valley has flood-prone areas, particularly during spring snowmelt and heavy rain events. Properties within or near the Sheyenne River floodplain may be in a FEMA-designated Special Flood Hazard Area (SFHA). ADU construction in a flood zone requires:

• A floodplain development permit from the City
• Finished floor elevations at or above the Base Flood Elevation (BFE)
• Compliance with West Fargo's floodplain management regulations

The broader Fargo-Moorhead metro's FM Diversion project is designed primarily to protect the Red River corridor, but local Sheyenne River flood conditions also affect parts of West Fargo. Verify your parcel's flood zone status with the City or the FEMA Flood Map Service Center before designing an ADU.

Extreme Climate Requirements

West Fargo shares the extreme continental climate of the Red River Valley, with winter temperatures regularly dropping to −20°F or below. All construction, including ADUs, must comply with North Dakota building codes requiring:

• Deep foundations extending well below the frost line (42–60 inches)
• High-performance insulation (walls, roof, foundation)
• Properly sized heating systems for extreme cold conditions

Permit Process

1. Confirm your property's zoning district and ADU eligibility with West Fargo Planning Department
2. Verify whether your parcel is in a FEMA flood zone
3. Submit a building permit application with construction drawings
4. Schedule required inspections at foundation, framing, mechanical, and final stages

Contact Information

City of West Fargo Planning Department

• Website: westfargond.gov/government/departments/planning
• Address: City Hall, 800 4th Avenue East, West Fargo, ND 58078
• Phone: (701) 433-5300

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 West Fargo Planning Department and consult a licensed architect or contractor before beginning any project.