ADU Rules in Blacksburg, Virginia

Blacksburg is a town in Montgomery County in southwestern Virginia, with approximately 45,000 residents — the majority of whom are associated with Virginia Tech (VT), one of Virginia's premier public research universities. Blacksburg is NOT an independent city; it is a town that is part of Montgomery County. Properties within the town limits use Town of Blacksburg zoning rules; properties outside the town but in Montgomery County use county rules.

Virginia Tech's campus (known as "Grounds" in Virginia Tech parlance) occupies a large area adjacent to the town, and the university is the dominant economic and demographic force in the region. The town is set in the beautiful New River Valley in the Appalachian highlands, near the Appalachian Trail and the Jefferson National Forest. The combination of a large student population, relatively limited housing supply, and a growing university community makes Blacksburg one of the most competitive rental markets in rural Virginia — and ADUs are an increasingly important part of the housing solution.

Virginia statewide ADU law status

Virginia has no enacted statewide ADU preemption: SB 304 (2024) would have required by-right ADUs, but was deferred to the Virginia Housing Commission and not enacted. Va. Code § 15.2-2292.1 covers only temporary family health-care structures. This mandate significantly expands ADU availability in Blacksburg's residential neighborhoods.

Blacksburg Local Zoning for ADUs

Blacksburg's zoning ordinance includes single-family residential districts. The town has been attentive to housing supply issues given the VT enrollment pressures. Typical ADU standards in single-family zones:

• Maximum size: Generally limited to 1,200 square feet or a percentage of the primary dwelling's floor area
• Unit count: One ADU per single-family lot
• Types: Detached (new accessory structure), attached (addition to primary dwelling), or internal (basement, above-garage, or attic conversion)
• Setbacks: Detached ADUs must meet applicable rear and side setbacks; Blacksburg lots near campus can be relatively small, requiring careful siting
• Height: Detached ADUs typically limited to one story or approximately 16 feet
• Lot coverage: Combined coverage must not exceed the district maximum
• Utilities: Connection to town water and sewer required where available; Blacksburg has utility infrastructure throughout the developed area
• Parking: Check current requirements; Virginia state law limits parking requirements for ADUs near transit; Blacksburg has a robust bus transit system (Blacksburg Transit / BT)

Contact the Blacksburg Planning and Building Department at (540) 443-1200 or visit blacksburg.gov/government/departments/planning-building for current ordinance provisions.

Virginia Tech Campus Proximity

Properties close to the VT campus — particularly in neighborhoods like Hethwood, Tom's Creek, and the areas along Prices Fork Road, Perry Street, Grissom Lane, and adjacent streets — have the highest ADU rental value due to proximity to the university. Key considerations for campus-adjacent properties:

• Occupancy limits: Blacksburg defines "family" for zoning purposes; multiple unrelated adults (which describes most student households) may face occupancy limits that differ from family occupancy. Verify the current definition and maximum occupancy rules.
• Parking: Campus-area properties often have limited parking; verify ADU parking requirements and whether Blacksburg Transit access near the property qualifies for reduced parking under state law provisions
• Noise and nuisance: Areas with high student occupancy can generate noise and parking complaints; ensure compliance with town noise ordinances

Appalachian Region and Mountain Terrain Considerations

Blacksburg is in the Virginia highlands. While most town neighborhoods are on relatively level plateau terrain, some areas near stream corridors or on the plateau edges have sloped topography. Practical considerations:

• Stormwater: Virginia's VSMP (Virginia Stormwater Management Program) applies; new impervious surface may trigger stormwater management requirements
• Floodplain: Some low areas near Tom's Creek and other streams in and around Blacksburg are in FEMA floodplains; check msc.fema.gov for your property's designation
• Appalachian Trail: The AT passes near Blacksburg in the national forest; no direct regulatory impact on in-town ADU construction, but scenic viewshed considerations can be relevant for development in higher-elevation areas

Short-Term Rentals vs. Standard ADU Rental

Blacksburg's proximity to Virginia Tech creates demand for both:

• Long-term student rentals (academic-year leases) — standard residential use under ADU regulations
• Short-term rentals (Airbnb/VRBO for football weekends, graduation, conferences) — subject to separate short-term rental regulations

These are distinct regulatory categories. An ADU permitted for residential use can typically be leased long-term; short-term rental use requires separate verification with the town. Do not assume ADU permission extends to short-term rental use without confirming current short-term rental rules.

Permitting Process

1. Confirm jurisdiction — Verify your address is in the Town of Blacksburg (not Montgomery County)
2. Determine zoning district — Contact Planning and Building, (540) 443-1200, or use town GIS
3. Check occupancy rules — Understand occupancy limits if planning student rental
4. Flood zone check — Verify at msc.fema.gov if near Tom's Creek or another stream
5. Pre-application consultation — Blacksburg Planning and Building
6. Building permit application — Submit construction documents
7. Inspections and Certificate of Occupancy — Required before occupancy

Contact Information

• Blacksburg Planning and Building: (540) 443-1200 | blacksburg.gov/government/departments/planning-building
• Municipal Code: library.municode.com/va/blacksburg/codes/code_of_ordinances

Disclaimer: This guide provides general information only and is not legal or planning advice. Zoning regulations — including occupancy standards and short-term rental rules — change over time. Always verify current requirements directly with the Town of Blacksburg Planning and Building Department and the official municipal code before making any development decisions.