ADU Pass
Mavisdale
ADU Pass helps homeowners in Mavisdale, No County, Virginia navigate the permit paperwork for building an accessory dwelling unit. This area covers 1 ZIP code.
Map
ADU details
ADU legality: allowed-with-restrictions
ADUs in Mavisdale follow Buchanan County's special-use framework where applicable. Most ADU projects here in practice are family-member housing or workforce accommodation for mining operations; permitting bottleneck is septic/well capacity rather than zoning.
Cost scenarios
Fee breakdown (as of 2025-07)
Permitting process
Viability (permitted uses)
- Long-term rental: yes Long-term rental of an ADU is allowed where zoning permits; rental market is thin given low population.
- Short-term rental: unclear Buchanan County does not have a dedicated STR ordinance; rural Mavisdale area has thin tourist demand.
- Office rental: no Office rental to third parties not permitted in residential zones.
- Home office: yes Home occupations permitted under standard county rules.
- Studio / workshop: yes Personal artist/workshop studio is a permitted accessory use.
- Agriculture: yes Buchanan County's rural Appalachian character preserves agricultural and resource-extraction uses by right.
- Relative support: yes Family-member housing in accessory structures is a traditional Appalachian use; routinely permitted.
Contacts
Utilities
- Water: Buchanan County PSA (Public Service Authority) where service exists; most Mavisdale parcels on private well · 60d connect · $8,500
- Sewer: Private septic with VDH Cumberland Plateau District permitting; no public sewer in most of Mavisdale · 75d connect · $18,000
- Electric: Appalachian Power Company (AEP) · 35d connect · $2,800
- Gas: Propane (no natural-gas distribution in most of rural Buchanan County) · 14d connect · $1,800
Property values & taxes
Construction timeline
Realistic total: best 9mo · typical 13mo · worst 20mo
Modular pathway inspectors are novice with modular
Mavisdale's mountainous access via narrow State Route 632 and US Route 460 limits module size; switchback roads add transport cost.
Financing
State ADU loans:
Insurance impact
HOA prevalence & preemption
Rural Buchanan County has minimal HOA presence; most parcels are deeded directly without covenant association. Virginia POAA does not preempt HOA ADU bans where they exist.
Regulatory overlays (2)
- flood-zone
Buchanan County has experienced repeated catastrophic flooding (Levisa Fork and Russell Fork drainages); Mavisdale-area parcels along State Route 632 may be in FEMA flood zones. Verify on FEMA flood maps before siting an ADU. - other
Coal-mining subsidence: Buchanan County is heavily underlain by active and historic coal mining (Buchanan Mine #1 longwall operations through the Pocahontas 3 seam). Surface owners should verify mineral-rights ownership and subsidence-risk disclosures before substantial foundations.
Technical envelope (climate & building code)
Climate & energy code
Building code
Amendments:
- Amendment
- Amendment
Contractor market (aggregate)
Legal history (timeline)
Current ordinance: Buchanan County Code, Land Use chapter (general zoning framework), adopted 1988-01-01, last amended 2023-01-01
- 2010-01-01 — Buchanan County zoning code (eCode360 publication) governs Mavisdale CDP (county-ordinance)
Buchanan County's Land Use chapter and Subdivision of Land provisions provide the regulatory framework; no dedicated ADU article exists.
Effect: ADUs in Mavisdale follow general county special-use process when applicable. - 2026-04-14 — Virginia SB 531 signed: statewide by-right ADUs effective July 1, 2027 (state-law)
Governor Spanberger signed SB 531 mandating localities permit ADUs in single-family zoning as a permitted accessory use, capping permit fees at $500.
Effect: Buchanan County will need to adopt an ADU ordinance by July 1, 2027; existing absence of a dedicated ordinance means the county likely does NOT qualify for grandfathering.
Known issues (3)
- other — Foundation engineering and title review must address mining-subsidence risk; insurance coverage may include mine-subsidence rider.
- other — ADU siting in flood zones requires elevated finished floor construction and is more expensive than benchmark.
- other — Contractor lead times longer than benchmark; quality control is a project-management concern.
County: no attribution (synthetic bucket)
No county
This city sits in the state's "no county" bucket — its ADU rules derive directly from state law and city ordinance without a county intermediary. No county-level sections apply.
Virginia state — ADU law and programs
State ADU law
Virginia has NOT enacted a statewide ADU preemption law. Virginia is a Dillon Rule state — localities possess only those powers expressly granted by the General Assembly — and the statutes granting zoning authority (Va. Code § 15.2-2280 et seq.) leave ADU regulation to local ordinances. ADU permission, setbacks, parking, size, and owner-occupancy rules therefore vary by county, independent city, and town. Virginia is unique in that it has 38 independent cities that function as counties (neither in nor subordinate to the surrounding county), meaning 'the county' for any given Virginia property may be an independent city rather than a true county. Several ADU preemption bills have been introduced in recent General Assembly sessions (2022 through 2025) without enactment; none have advanced past committee as of the Assembly's 2026 regular session adjournment.
State financing programs
Virginia does not operate an ADU-specific statewide loan, grant, or forgivable-loan program. Virginia Housing (formerly the Virginia Housing Development Authority, VHDA — rebranded 2020) administers general first-time-homebuyer, down-payment-assistance (DPA), mortgage-credit-certificate, and rehabilitation products that can be applied to ADU-adjacent purchases or improvements when eligibility criteria are met, but none target ADU construction as a distinct product. The Virginia Department of Housing and Community Development (DHCD) administers federal HOME and CDBG pass-through funds that local jurisdictions can direct toward ADU-adjacent rehab, but there is no state-level ADU-dedicated line item. Federally available products (FHA 203(k), Fannie Mae HomeReady and HomeStyle Renovation, Freddie Mac CHOICERenovation) remain the primary ADU financing path for Virginia homeowners.
State housing programs
Virginia does not run a state-level pre-approved-ADU-plan catalog, statewide impact-fee-waiver statute for ADUs, or streamlined-review mandate. State-level programs that touch ADU-adjacent policy are coordinated primarily through the Department of Housing and Community Development (DHCD) and Virginia Housing, and act by funding or assisting local jurisdictions rather than by preemption. Local ADU activity — Arlington County's Accessory Dwellings program (detached ADUs permitted since 2008, liberalized 2020), Alexandria's accessory-dwelling ordinance, Fairfax County's accessory-living-unit program, and Charlottesville's 2021 zoning-code changes — is authorized under the localities' Va. Code § 15.2-2280 zoning authority, not by state mandate.
- DHCD Community Development Block Grant (CDBG) Program — Federal CDBG funds administered by DHCD to eligible non-entitlement Virginia localities for community-revitalization, housing-rehab, and infrastructure projects. Not ADU-specific. Participating localities can direct CDBG funds toward housing-rehab projects where local policy supports ADUs.
- DHCD HOME Investment Partnerships Program — Federal HOME funds administered by DHCD to Virginia participating jurisdictions and non-profits for affordable-housing acquisition, rehab, and new construction. Not ADU-specific; can be directed to ADU-adjacent rehab at local discretion.
- Virginia Housing Commission — Permanent advisory commission of the General Assembly that studies housing-policy questions and recommends legislation. Has periodically studied ADU preemption and missing-middle housing without recommending statewide enactment as of 2026-04-21.
- Local ADU ordinances under Va. Code § 15.2-2280 authority — Not a state program — listed here because Virginia ADU policy is executed entirely at the locality level under the § 15.2-2280 zoning grant. A homeowner seeking to build an ADU consults the zoning ordinance of the specific county, city, or town where the parcel is located.
Federal (United States) — ADU-relevant rules and programs
Federal ADU law
The United States has no federal statute that directly regulates accessory dwelling unit entitlement or design. Land-use authority over ADUs resides with states and local governments under the traditional police power. Federal engagement is limited to financing (Fannie/Freddie/FHA/VA/USDA), flood insurance (FEMA/NFIP), and discretionary housing programs (HUD), which are recorded in sibling sections of this file.
Federal financing programs
Federal housing-finance agencies and GSEs set nationwide underwriting rules that govern whether an ADU can be financed, appraised, and counted toward mortgage qualifying income. The relevant actors are Fannie Mae, Freddie Mac, FHA (HUD), VA, and USDA Rural Development.
Federal tax credits
There is no ADU-specific federal tax credit. ADUs may incidentally qualify for existing federal energy-efficiency and clean-energy tax credits when the ADU construction includes qualifying measures.
Federal housing programs
HUD administers several discretionary programs that can fund ADU-related activity at the grantee's election, but none is an ADU-specific program.
ZIP Code
- 24627
Post Office
- 9170 Garden Creek Rd, 24627