Toms Brook

Shenandoah County, Virginia regulates accessory dwelling units through its Zoning Ordinance, administered by the Department of Community Development and adopted by the Shenandoah County Board of Supervisors. Virginia is a Dillon Rule state and has NOT enacted a statewide ADU preemption law — Va. Code § 15.2-2280 et seq. delegates zoning authority entirely to localities — so every ADU rule that applies to a Shenandoah County parcel is local. Unlike neighboring Frederick County (which surrounds the independent city of Winchester), Shenandoah County contains incorporated towns (Edinburg, Mount Jackson, New Market, Strasburg, Toms Brook, and the county seat of Woodstock) rather than independent cities — under Virginia's unusual city/town/county structure, incorporated towns in Virginia are governed BY their counties for zoning in addition to their own town zoning when a town has adopted one. The Shenandoah County Zoning Ordinance permits 'accessory apartments' and 'accessory dwelling units' as accessory uses subject to zoning-district conditions in certain districts; the county's rural / agricultural districts (A-1 Agricultural and adjacent designations) and residential districts include specific provisions for single-family-dwelling-related accessory units. Because Virginia's 2022-2025 General Assembly sessions did not enact statewide ADU preemption, accessory-dwelling approval in Shenandoah County is a locally-administered process without a statewide ministerial-review floor, minimum ADU size, parking cap, or owner-occupancy preemption.

• Shenandoah County Code — Zoning Ordinance (Accessory uses and accessory dwelling provisions)
• Shenandoah County Code — Subdivision Ordinance and supplementary land-use regulations
• Shenandoah County Comprehensive Plan — Land-use and housing elements
• Virginia Code § 15.2-2280 et seq. — State zoning enabling authority (Dillon Rule)
• Virginia Code § 15.2-2316.3 — Statutory safe harbor for family-member accessory dwelling

State-floor overlay: None. Virginia has not enacted a statewide ADU preemption law. Va. Code § 15.2-2280 et seq. delegates zoning authority to localities without imposing a floor on ADU permissibility, ministerial approval, minimum size, or parking. Shenandoah County's Zoning Ordinance is therefore the operative rule set for every ADU question — allowance by district, size limits, owner-occupancy, parking, permit process, and fees are all locally set. ADU bills introduced in the 2022-2025 General Assembly sessions did not advance; the 2026 session had not closed the gap as of 2026-04-21. Additionally, note that the incorporated towns within Shenandoah County (Edinburg, Mount Jackson, New Market, Strasburg, Toms Brook, Woodstock) maintain their own town zoning in addition to county zoning — for a town-limits parcel, both the town ordinance and any county supplemental rules apply; for an unincorporated county parcel outside all town limits, only the county ordinance applies.

Shenandoah County, Virginia administers or cooperates in several overlay and environmental-review regimes that can affect ADU siting on unincorporated parcels: (1) FEMA Special Flood Hazard Areas along the county's principal watercourses — the North Fork of the Shenandoah River is the county's defining drainage, running the length of the county from southwest to northeast; Cedar Creek, Stony Creek, Passage Creek, Tumbling Run, and numerous tributaries also have mapped SFHAs — subject to the county's floodplain-management ordinance; (2) historic overlay / advisory review — Shenandoah County has significant Civil War, German-Lutheran agricultural-settlement, and 18th/19th-century heritage, including the Cedar Creek and Belle Grove National Historical Park (shared with Frederick County on the northern boundary), the New Market Battlefield State Historical Park, and numerous individual properties on the Virginia Landmarks Register and National Register of Historic Places; (3) karst / sinkhole geology review — the county sits on carbonate bedrock in the northern Shenandoah Valley, where limestone and dolomite dissolution creates sinkholes, closed depressions, and compromised septic-drainfield suitability; (4) Massanutten Mountain and George Washington National Forest interface — the county's eastern boundary is the steep Massanutten Mountain ridge (a distinctive parallel ridge within the Valley and Ridge physiographic province), and much of the western boundary abuts the Lee and North River Ranger Districts of the George Washington and Jefferson National Forests, creating significant forest / wildland interface; (5) Chesapeake Bay Preservation Act — Shenandoah County lies in the Potomac River drainage and within the statewide Tidewater/non-Tidewater reach of the Act's erosion-and-sediment-control and stormwater-management provisions; (6) Virginia Department of Forestry wildfire-prevention programs for forest-interface parcels. Unlike California, Virginia does not maintain a Very-High-Fire-Hazard Severity Zone regime triggering mandatory WUI-rated construction.

• FEMA Special Flood Hazard Areas / Shenandoah County Floodplain Management Ordinance — Shenandoah County's floodplain-district regulations enforce FEMA NFIP minimum floodplain-management standards. Applicants should confirm effective FIRM panel numbers and BFEs at design time. The North Fork Shenandoah has well-mapped floodplain; parcels close to the river or to secondary drainages are the most likely to face floodplain-district constraints. FEMA is conducting ongoing FIRM updates in the Potomac drainage basin, and effective panels should be verified before design commitments.
• Shenandoah County historic-preservation review / Historic overlay and advisory review — Historic-overlay review does not typically prohibit an accessory dwelling outright but may add design-review requirements (materials, scale, siting, fenestration) for construction on or adjacent to designated historic resources. The Cedar Creek and Belle Grove NHP and New Market Battlefield State Historical Park are federal and state resources respectively and do not by themselves create local regulatory authority over private-parcel construction outside their own boundaries — but their proximity can inform county-level advisory review of adjacent private-parcel projects.
• Karst / sinkhole geotechnical review (carbonate-bedrock northern Shenandoah Valley) — Karst review is not a formal 'overlay' in the zoning-ordinance sense — it is a set of engineering and health-department constraints applied parcel-by-parcel. An accessory dwelling that requires a new or expanded septic drainfield on a karst-affected parcel is the category most likely to face substantive review, including geotechnical investigation, hydrogeologic evaluation, and alternative septic-system design (sand-mound, drip-irrigation, or advanced treatment systems approved by VDH). Groundwater-protection considerations are heightened because karst systems can transmit contamination rapidly from surface infiltration to private wells downgradient.
• George Washington National Forest interface and Massanutten Mountain ridge (forest / wildland interface) — There is no Shenandoah County-specific WUI ordinance comparable to western-state WUI regimes. Construction standards for accessory dwellings on forest-interface parcels follow the general Virginia USBC; voluntary Firewise USA measures (defensible space, ignition-resistant materials, roof and vent design, Class-A roof assemblies) are encouraged but not mandated by county zoning. Access for wildland firefighting apparatus on steep or long-driveway parcels can be a practical permitting consideration that Community Development or Building Inspections may flag during site-plan review.
• Virginia Chesapeake Bay Preservation Act / stormwater and erosion-and-sediment-control requirements — The ESC / stormwater requirements are land-disturbance-based, not ADU-specific. Their relevance to an accessory-dwelling project depends on the site-disturbance footprint rather than the dwelling program. Applicants should request a pre-application conference with Community Development if the parcel involves steep slopes, proximity to streams, or significant site grading.

Shenandoah County, Virginia's Department of Community Development (zoning, site-plan review, planning, and land-use approvals) and the county's Building Inspections function (building-permit, plan review, and inspection services under the Virginia Uniform Statewide Building Code) jointly administer ADU / accessory-dwelling permitting for parcels in the unincorporated county. Unlike Frederick County (which surrounds the independent city of Winchester), Shenandoah County contains incorporated TOWNS (Edinburg, Mount Jackson, New Market, Strasburg, Toms Brook, Woodstock) which under Virginia law remain inside the county's jurisdiction — each town has its own town zoning, but county ordinances still apply on town-limits parcels except where superseded by town rules, and the county handles building-inspection permitting for the whole county including town parcels. Shenandoah County permitting therefore applies (a) to the unincorporated balance of the county — the vast majority of the county's roughly 512 square miles of land area in the northern Shenandoah Valley — and (b) with town coordination, to parcels inside the incorporated town limits. The county's permitting path for an accessory dwelling is sequenced: (a) zoning determination by Community Development confirming the parcel's district and the district's accessory-dwelling allowance; (b) special-use-permit or conditional-use-permit application heard by the Planning Commission and decided by the Board of Supervisors when required by the zoning district; (c) building-permit application to county Building Inspections; (d) Lord Fairfax Health District (Virginia Department of Health) approval for on-site septic and private-well where applicable (the majority of Shenandoah County's rural parcels are on private well and septic, not public water/sewer); (e) inspection and certificate of occupancy.