ADU Pass
Unionville
ADU Pass helps homeowners in Unionville, Orange 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 are permitted in Unionville under Orange County's accessory-apartment provisions (one per parcel, smaller than principal). Detached ADU with kitchen requires SUP; guest houses without cooking can be built by-right. Orange Springs (NRHP, 1992) is a nearby historic property and not a district-wide overlay - most Unionville parcels do not face mandatory historic-design review. SB 531 introduces by-right ADU floor effective 2027-07-01.
Cost scenarios
| Scenario | Sq ft | Permit | Build | Total |
|---|---|---|---|---|
| minimum | 200 | $2,050 | $44,600 | $46,650 |
| 600 | 600 | $2,050 | $133,800 | $135,850 |
| maximum | 900 | $2,050 | $200,700 | $202,750 |
Fee breakdown (as of 2026-05)
Permitting process
Viability (permitted uses)
- Long-term rental: yes Long-term rental of an ADU is generally permitted; Virginia Residential Landlord and Tenant Act governs.
- Short-term rental: with-restrictions Orange County zoning ordinance requires Transient Occupancy / STR approval; Virginia Transient Occupancy Tax applies.
- Office rental: with-restrictions Detached office rental requires home-occupation approval; rural districts allow home-occupation subject to traffic, signage, and storage limits.
- Home office: yes Home occupation is permitted in residential and rural districts.
- Studio / workshop: yes Personal studio is a permitted accessory use.
- Agriculture: yes Agricultural districts permit farm structures and tenant-house allowance on bona fide farms.
- Relative support: yes Family / multi-generational accessory dwelling under accessory-apartment allowance is the common pattern.
Contacts
Utilities
- Water: Private wells govern Unionville parcels; no public water in the community · 45d connect · $9,300
- Sewer: Private septic system standard; Virginia Department of Health evaluation required · 60d connect · $13,800
- Electric: Rappahannock Electric Cooperative (REC) is the dominant provider in eastern Orange County · 30d connect · $2,700
- Gas: Bottled propane is the rural norm; no piped natural gas in Unionville · 14d connect · $1,850
Property values & taxes
Construction timeline
Realistic total: best 10mo · typical 14mo · worst 21mo
Modular pathway inspectors are experienced with modular
Financing
State ADU loans:
Insurance impact
HOA prevalence & preemption
Virginia has no HOA-ADU preemption. Unionville is largely rural-agricultural outside HOA control.
Technical envelope (climate & building code)
Climate & energy code
Building code
Amendments:
- Amendment
Contractor market (aggregate)
Legal history (timeline)
Current ordinance: Orange County Zoning Ordinance (per-district use tables and Article 17 supplementary regulations), adopted 2013-01-01, last amended 2024-01-01
- 1979-01-01 — Va. Code Section 15.2-2280 zoning authority codified (Dillon Rule baseline) (state-statute)
Virginia delegated zoning authority to localities without ADU-specific preemption.
Effect: Orange County governs ADU rules locally; ADUs not automatically permitted statewide. - 1992-01-01 — Orange Springs (near Unionville) added to National Register of Historic Places (federal-listing)
Orange Springs, a historic mineral-springs resort near Unionville, was added to the NRHP in 1992.
Effect: Federal Section 106 review applies to federally-permitted actions affecting the listed property; most Unionville parcels are outside the listed site boundary. - 2013-01-01 — Orange County Zoning Ordinance comprehensive update (local-ordinance)
Orange County rewrote its zoning ordinance with district-level use tables.
Effect: Accessory-apartment provisions confirmed: smaller-than-principal size; one per parcel; SUP required for detached second dwelling with kitchen. - 2026-04-14 — Virginia SB 531 signed by Governor Spanberger (state-statute)
Statewide by-right ADU mandate signed.
Effect: Effective 2027-07-01, Virginia localities must permit ADUs by-right in single-family residential districts and cap permit fees at $500.
Known issues (2)
- other — Budget for SUP hearing cycle on top of construction time.
- other — Septic and well costs ($13.8k + $9.3k = $23.1k combined) are material for small-ADU budgets.
Orange County — county ADU rules and overlays
County ADU ordinance
Orange County does NOT maintain a standalone accessory-dwelling-unit ordinance with dedicated definitional and standards sections analogous to Fairfax or Fauquier. ADUs in Orange County are regulated indirectly: the zoning ordinance defines 'dwelling, single-family detached' and 'accessory use' / 'accessory structure,' and the per-district use tables in the A (Agricultural), RR (Rural Residential), and R-1/R-2/R-3/R-4 residential districts permit one principal dwelling per lot with accessory structures customarily incidental to the principal use. A second dwelling unit on the same lot is typically handled either as (a) a 'tenant house' / 'farm labor dwelling' allowance in the A Agricultural district subject to minimum lot area and a special-use permit, (b) a 'guest house' as an accessory structure without kitchen facilities, or (c) a family-care / in-law arrangement administered through the zoning administrator. A fully independent detached ADU with its own kitchen on a residential-district parcel generally requires a Special Use Permit from the Board of Supervisors after Planning Commission review. Applicants should confirm the current Section text and the applicable district's use table with the Zoning Administrator before committing to a pro forma — the ordinance has been amended repeatedly since the 2013 update and specific ADU-like allowances vary by district.
County regulatory overlays
Orange County administers several overlay regimes that bear materially on ADU projects: (1) a Floodplain Overlay District tied to FEMA Special Flood Hazard Areas along the Rapidan River, the Robinson River, and their tributaries, administered by the Department of Planning and Zoning; (2) locally-adopted Historic Overlay Districts reviewed by the county (in addition to separately-administered town historic overlays in the Town of Orange and the Town of Gordonsville, and the federally-significant Montpelier Station area); (3) a substantial footprint of conservation easements held by the Virginia Outdoors Foundation (VOF) and the Piedmont Environmental Council (PEC), particularly concentrated in the rural western and southern parts of the county; (4) the Chesapeake Bay Preservation Act does NOT reach Orange County — the county is inland and outside the Tidewater CBPA jurisdiction. Orange County has no coastal-commission jurisdiction, no CalFire-equivalent WUI regulatory overlay (Virginia has no statewide WUI overlay), and no seismic-retrofit overlay.
- Floodplain Overlay District
- Orange County Historic Overlay Districts (including the Montpelier Station vicinity, Barboursville, and rural historic corridors)
- Conservation Easement Overlay (VOF- and PEC-held easements)
- Montpelier viewshed and heritage-tourism landscape
County permitting (unincorporated parcels)
Orange County's Department of Planning and Zoning handles zoning permits, Special Use Permits, site plan review, and subdivision review for every parcel in the county except those inside the Town of Orange and the Town of Gordonsville (which administer their own zoning). The Department of Building Inspections issues building permits and trade permits for the same territory. A typical ADU-like permit bundle (where a second dwelling is permitted) includes: (1) a Special Use Permit from the Board of Supervisors with Planning Commission recommendation, unless the parcel qualifies for an A-district tenant/farm-labor dwelling allowance, (2) a Zoning Permit confirming use compliance and district setback compliance, (3) a Building Permit with stamped residential plans, (4) Electrical, Plumbing, and Mechanical trade permits, (5) a Virginia Department of Health (VDH) - Rappahannock-Rapidan Health District construction permit for well and/or septic on parcels not served by public water or sewer (most rural Orange County parcels), (6) a Floodplain Development Permit if any portion of the parcel is within the Floodplain Overlay District, and (7) a Historic District review if the parcel is within a designated historic overlay (Orange County has several — the Montpelier Station area, the Barboursville historic district, and portions of rural Orange — in addition to the separate town historic overlays).
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
- 22567
Post Office
- 23209 Village Rd, 22567