ADU Rules in Clarksburg, West Virginia

Clarksburg is the seat of Harrison County in north-central West Virginia, with approximately 15,000 residents. The city holds a notable place in both Civil War history — as the birthplace of Confederate General Thomas "Stonewall" Jackson — and modern federal government operations, as the home of the FBI's Criminal Justice Information Services (CJIS) Division, which maintains the largest fingerprint database in the world. This federal presence provides a stable employment base that is unusual for a WV city of its size.

No Statewide ADU Law in West Virginia

West Virginia has no statewide ADU preemption law. The state legislature has not required municipalities to allow ADUs or set minimum standards. Clarksburg's local zoning ordinance is the sole governing document for ADU permissibility within city limits. Property owners must comply with local rules.

Clarksburg's Local ADU Regulations

Clarksburg regulates land use through a conventional zoning structure with residential, commercial, and industrial districts. The city does not have a modern, dedicated ADU pathway.

• R-1 Single-Family districts: Detached garages and storage accessory structures are generally permitted. Establishing a second dwelling unit — whether a garage apartment, basement unit, or backyard cottage — typically requires verifying that such use is permissible in R-1 zoning, potentially through a variance or special exception.
• R-2 Two-Family and R-3 Multi-Family districts: Greater flexibility exists for second and additional dwelling units. Properties in these zones may accommodate ADU configurations more readily.
• Typical setbacks: Front setbacks of approximately 25 ft, side setbacks of 5–8 ft, rear setbacks of 20 ft in residential zones. Accessory structures may qualify for reduced rear-yard setbacks.

Verify all current regulations with the Clarksburg Planning Department before committing to any design.

Critical: Mine Subsidence Risk

Mine subsidence is a significant site-specific risk to evaluate before building any structure in Clarksburg or Harrison County. The north-central WV coalfields, including Harrison County, have an extensive underground coal mining history. Areas beneath parts of Clarksburg and surrounding communities may overlie old mine workings.

Mine subsidence — the settling, cracking, or sinking of ground surface above old underground mines — can cause serious damage to foundations and structures. Before planning any ADU project in Clarksburg:

• Consult historical mine maps through the WV Geological and Economic Survey (WVGES) at wvgs.wvnet.edu. WVGES maintains records of underground mine workings that can help identify subsidence risk for a specific property.
• Consider mine subsidence insurance, available as a standalone policy for properties in former mining areas
• For projects involving deep excavation or significant foundation loads, a geotechnical assessment is strongly recommended
• Properties in areas of known subsidence risk may face lending or insurance complications for any new structure

Flooding Considerations

Clarksburg sits near the West Fork River and its tributaries. While not on a major navigable river, localized flooding is a real risk. The June 2016 West Virginia floods caused catastrophic damage across the state — including in north-central WV — prompting widespread FEMA flood zone remapping.

Before pursuing an ADU:

• Check FEMA flood maps at msc.fema.gov
• Properties near the West Fork River, Elk Creek, or other local waterways may be in designated flood zones
• Properties in SFHAs must comply with NFIP elevation standards
• Below-grade or basement ADUs are generally not viable in flood-prone areas

FBI/CJIS Employment Context

The FBI CJIS facility outside Clarksburg employs thousands of federal workers, providing unusual employment stability for a WV community of this size. This federal employment base creates moderate rental demand for workers who may prefer to live within a reasonable distance of the facility. For property owners in appropriately zoned areas, this adds some rental market support for an ADU.

Permit Process

To pursue an ADU in Clarksburg:

1. Contact the Clarksburg Planning and Zoning Department at (304) 624-1600 to determine if your zoning district permits an ADU
2. Check for mine subsidence risk by consulting WVGES mine maps
3. Verify flood zone status via FEMA maps
4. Submit building permit application with plans meeting WV State Building Code (IRC-based)
5. Complete required inspections throughout construction
6. Obtain Certificate of Occupancy before the unit is occupied

Contact Information

• Clarksburg Planning Department: (304) 624-1600 | clarksburgwv.com
• Clarksburg Municipal Code: library.municode.com/wv/clarksburg
• WV Geological and Economic Survey (Mine Maps): wvgs.wvnet.edu
• FEMA Flood Maps: msc.fema.gov

Disclaimer: This page provides general information only and does not constitute legal or zoning advice. Always verify current requirements with the City of Clarksburg, consult the municipal code, and review mine subsidence and flood risks before making any development decisions.