Marion

Smyth County, Virginia (the far southwestern Virginia county in the Great Valley of the Blue Ridge between the Middle Fork Holston River and the New River drainages, seated at the Town of Marion and extending south to the northern boundary of the Mount Rogers National Recreation Area — not to be confused with Smyth County, Arkansas, which does not exist, or Smith County in other states) regulates accessory dwelling units through its county Zoning Ordinance, administered by the Smyth County Community and Economic Development / Planning function under the authority of the Smyth County Board of Supervisors. Virginia is a Dillon Rule state (Commonwealth v. County Bd. of Arlington County, 217 Va. 558 (1977)); the General Assembly has not enacted any statewide ADU preemption, and Smyth County's authority to regulate or permit second dwellings derives solely from the general zoning enabling statute at Va. Code § 15.2-2280 and the ordinance-content authorization at § 15.2-2286. Smyth County has not adopted a standalone ministerial ADU ordinance of the California / Oregon / Washington type. Second-dwelling pathways on unincorporated parcels are: (a) a family-member accessory-dwelling pathway under the county's zoning ordinance where a related occupant is intended and the ordinance supports it; (b) a Special Use Permit approved by the Board of Supervisors following Planning Commission recommendation, which is the typical path for a non-kin rental second dwelling; or (c) a minor subdivision to place the second dwelling on its own lot. The Town of Marion (county seat), the Town of Chilhowie, and the Town of Saltville are the incorporated municipalities within Smyth County and maintain their own separate zoning ordinances governing parcels within their respective town corporate limits — this county ordinance does NOT apply inside those town limits. Unincorporated communities including Atkins, Sugar Grove, Groseclose, Adwolfe, Rich Valley, and Broadford are governed by the county. Smyth County is a small, predominantly rural Appalachian county of roughly 29,000-30,000 residents across about 452 square miles, with substantial open agricultural land, forested mountain terrain adjacent to the Mount Rogers National Recreation Area and Jefferson National Forest, and low-density residential patterns outside the three incorporated towns; this context shapes the ordinance's by-right dwelling-size, setback, and well/septic assumptions.

• Smyth County Code — Zoning Ordinance (as maintained on Municode)
• Smyth County Community and Economic Development / Planning (zoning administration, SUP intake, subdivision review)
• Smyth County Board of Supervisors — adopting body for zoning-ordinance amendments and Special Use Permits
• Smyth County Planning Commission
• Va. Code § 15.2-2280 — general zoning enabling authority for Virginia localities
• Va. Code § 15.2-2286 — permissible contents of local zoning ordinances

State-floor overlay: Virginia has not enacted any statewide ADU preemption statute. Virginia is a Dillon Rule state: localities possess only those powers expressly granted by the General Assembly (Commonwealth v. County Bd. of Arlington County, 217 Va. 558 (1977); Board of Supervisors of James City County v. Rowe, 216 Va. 128 (1975)). The general zoning enabling statute at Va. Code § 15.2-2280 grants counties broad authority to regulate land use, and § 15.2-2286 enumerates the specific ordinance provisions that may be included. Neither statute, nor any section of Title 15.2 Chapter 22 Article 7, mandates that a locality permit ADUs, requires ministerial (non-discretionary) review of ADU applications, caps parking requirements, caps fees, voids owner-occupancy requirements, or otherwise preempts local ADU decision-making. ADU preemption bills have been introduced in the Virginia General Assembly in multiple recent sessions (HB 2046 in 2023; HB 900 and HB 1628 in 2024; related bills in 2025) without enactment of a statewide ADU-by-right preemption. Smyth County is therefore free to permit, restrict, or prohibit second dwellings under its zoning ordinance, within the ordinary constitutional limits on land-use regulation and subject to the Virginia Fair Housing Law.

Smyth County administers or is subject to several overlay regimes that materially affect ADU siting on unincorporated parcels: (1) FEMA National Flood Insurance Program Special Flood Hazard Areas along the Middle Fork Holston River (which traverses the county through Marion, Chilhowie, and Atkins), the North Fork Holston River (through Saltville and Broadford), Staley Creek, Cedar Creek, and various tributaries, administered through the county's floodplain ordinance; (2) extensive karst-terrain considerations across the county — Smyth County lies within the Appalachian Valley-and-Ridge carbonate-rock belt and contains notable karst features including the Saltville area salt deposits (historically a major industrial site with lingering environmental-remediation considerations under the Virginia DEQ Superfund legacy at the Olin/Mathieson/former industrial lands), sinkholes throughout the Great Valley floor, and limestone drainage — which affect septic siting and foundation design (the Virginia Department of Environmental Quality has karst-area guidance and the Virginia Department of Health applies specific septic standards in karst areas); (3) wildfire risk tracked by the Virginia Department of Forestry in the more heavily forested portions of the county adjacent to the Jefferson National Forest and Mount Rogers National Recreation Area — wildfire risk is elevated in the high-elevation southern end of the county on Whitetop Mountain approaches, in the Iron Mountains, and in the Clinch Mountain ridge along the northern boundary — Virginia does not have a California-style Very High Fire Hazard Severity Zone regulatory overlay with mandatory ignition-resistant construction requirements, and the Virginia Uniform Statewide Building Code has not statewide-adopted the International Wildland-Urban Interface Code; (4) Agricultural and Forestal Districts (AFDs) established under Va. Code § 15.2-4300 et seq., which provide participating landowners use-value taxation and subdivision-deferral protections in exchange for a commitment to keep land in agricultural or forestal use — Smyth County, as a significantly agricultural county with substantial cattle, dairy, hay, and Christmas-tree operations in the Great Valley and mountain hollows, has established AFDs over the years, and an ADU on an AFD-enrolled parcel is generally permitted for agricultural-accessory uses but may conflict with AFD purposes if proposed as non-agricultural commercial rental; (5) Chesapeake Bay Preservation Act applicability — Smyth County is NOT in the Tidewater area covered by the Chesapeake Bay Preservation Act (Va. Code § 62.1-44.15:67 et seq.), and the county's waters drain via the Holston River system to the Tennessee River and ultimately the Mississippi, not the Chesapeake Bay, so Resource Protection Areas (RPAs) and Resource Management Areas (RMAs) do not apply; (6) Jefferson National Forest and Mount Rogers National Recreation Area adjacency — the entire southern boundary of Smyth County abuts the Mount Rogers NRA within the Jefferson National Forest (managed by the U.S. Forest Service as part of the George Washington and Jefferson National Forests), including the approaches to Mount Rogers (Virginia's highest peak at 5,729 feet, immediately south in Grayson County), Whitetop Mountain, and the Iron Mountains; federal and state lands are outside the scope of county zoning, but adjacency to these lands affects private-parcel development on neighboring properties and drives significant short-term-rental and second-home demand in Sugar Grove and the Rich Valley / Hurricane area; (7) Hungry Mother State Park — a Virginia Department of Conservation and Recreation state park immediately north of the Town of Marion with a 108-acre lake and 2,200 acres of mountain-and-forest recreational land, one of the original six Virginia state parks established in the Civilian Conservation Corps era — state-park land is outside county zoning, but adjacent private parcels face scenic, access, wildlife, and short-term-rental-demand considerations; (8) historic-resource considerations — the Saltville area contains significant archaeological and paleontological resources (Pleistocene megafauna kill sites, Saltville Valley prehistoric salt licks) protected under federal and state law where federal permits or funding are involved, and the historic Great Wagon Road / Wilderness Road corridor passes through the county; (9) Superfund / legacy-contamination considerations — the former Olin Corporation / Mathieson Alkali Works industrial complex at Saltville is a federal Superfund remediation site (the Saltville Waste Disposal Ponds site), with institutional controls and environmental-covenant restrictions on specific parcels that materially constrain residential construction on affected lands; owners of parcels in the Saltville industrial-legacy footprint must check the EPA Superfund record and any recorded environmental covenants before planning an ADU project.

• FEMA National Flood Insurance Program — Special Flood Hazard Areas (Middle Fork Holston, North Fork Holston, Staley Creek, others) — Smyth County participates in the National Flood Insurance Program and administers a county floodplain ordinance satisfying the NFIP minimum standards. Principal Special Flood Hazard Area (SFHA) extents in the county include the Middle Fork Holston River corridor (flowing westward through Atkins, Marion, Chilhowie, and Seven Mile Ford), the North Fork Holston River corridor (through Saltville and Broadford), Staley Creek, Cedar Creek, and various tributaries throughout the Great Valley floor. An ADU within an SFHA must comply with NFIP elevation requirements (lowest finished floor at or above Base Flood Elevation plus any county freeboard — Virginia's Uniform Statewide Building Code sets a baseline freeboard but counties may add more), flood vent requirements on enclosed areas below BFE, anchoring requirements, and post-construction Elevation Certificate filing. Owners should confirm the current-effective FIRM panel at the FEMA Map Service Center before design; FEMA periodically updates Virginia county maps. Lenders and the NFIP Write Your Own program will require flood insurance for mortgaged SFHA parcels.
• Karst and sinkhole terrain — septic and foundation implications — Substantial portions of Smyth County lie within the Appalachian Valley-and-Ridge carbonate-rock belt (the Great Valley section), where sinkholes, disappearing streams, caves, and subsurface drainage pathways are common. The Saltville area is particularly notable: the Saltville Valley contains extensive bedded salt and gypsum deposits (the basis for the region's 19th- and 20th-century salt-mining industry) overlain by carbonate and shale rocks, and the valley has documented subsidence features from historical salt extraction and natural karst processes. Karst terrain materially affects ADU siting in two ways: (a) the Virginia Department of Health applies enhanced setback and design standards for on-site sewage disposal systems (septic) in karst areas to protect groundwater, which can rule out some parcels for additional dwelling-unit septic capacity or require alternative (e.g., mound, pretreatment, or low-pressure-dose) septic designs at substantially higher cost; (b) foundation design for a detached ADU on karst terrain may require enhanced geotechnical investigation and design to address sinkhole and subsidence risk, adding engineering cost. The Virginia Department of Environmental Quality publishes karst-area guidance and the Virginia Geological Survey publishes sinkhole-inventory maps; owners should consult these resources and the Mount Rogers Health District at the pre-application stage.
• Virginia Agricultural and Forestal Districts (local option under state law) — Smyth County, as a predominantly agricultural county with substantial cattle, dairy, hay, mixed-livestock, and Christmas-tree operations in the Great Valley floor and upland hollows, has established Agricultural and Forestal Districts under the state AFD Act. Enrollment is voluntary; participating landowners commit to keeping land in agricultural or forestal use for a specified term (typically 4-10 years) in exchange for use-value assessment (Va. Code § 58.1-3230 et seq.) and limited protection from certain governmental actions that would disrupt agricultural use. An ADU on an AFD-enrolled parcel is generally permitted if it is an accessory use to continued agricultural operation (e.g., a farm-labor dwelling, family-kinship dwelling, or tenant farmer residence), but non-agricultural commercial-rental ADUs may conflict with AFD purposes and trigger AFD committee review or require withdrawal from the district with possible rollback-tax consequences. Owners should consult the Smyth County AFD Advisory Committee and the Planning Department's zoning administrator before assuming ADU compatibility with an AFD-enrolled parcel.
• Virginia Department of Forestry wildfire risk and Virginia Statewide Building Code WUI provisions — Virginia has wildfire risk in the Appalachian and Blue Ridge counties, and Smyth County's southern boundary adjacent to the Jefferson National Forest / Mount Rogers National Recreation Area — including the approaches to Whitetop Mountain, Iron Mountain, and the Mount Rogers high country — has materially elevated wildfire exposure. The Clinch Mountain ridge along the northern boundary also presents wildfire risk. Unlike California, Virginia does not have a statewide Very High Fire Hazard Severity Zone overlay that mandates WUI-rated construction materials on a per-parcel basis. The Virginia Department of Forestry publishes wildfire risk assessments and promotes defensible-space practices, but enforcement is advisory rather than regulatory. The Virginia Uniform Statewide Building Code, which is the single statewide building code (localities cannot impose more stringent building standards), does not statewide-adopt Appendix K or the International Wildland-Urban Interface Code. Owners in wildfire-exposed Smyth County locations — Sugar Grove, upper Rich Valley, the Clinch Mountain side of the county — should follow best practices but face no locality-imposed WUI construction overlay analogous to California Chapter 7A.
• Jefferson National Forest and Mount Rogers National Recreation Area adjacency — The entire southern boundary of Smyth County lies adjacent to the Mount Rogers National Recreation Area, a unit of the Jefferson National Forest administered by the U.S. Forest Service. The Mount Rogers NRA encompasses over 200,000 acres including Virginia's highest peak (Mount Rogers, 5,729 feet, in Grayson County immediately south of Smyth) and significant portions of the Iron Mountains and Whitetop Mountain. The Appalachian Trail traverses the NRA. Jefferson National Forest land is federal; federal regulation applies to activities within the forest boundary, not to private parcels outside it. However, private parcels abutting the national forest — particularly in Sugar Grove, on the upper Middle Fork Holston River approaches to the NRA, and in the Hurricane / Konnarock gateway area — face scenic, access, wildlife, and wildfire considerations, and individual deed restrictions, conservation easements, or access easements may apply to specific parcels. The Mount Rogers NRA adjacency is a significant driver of second-home and short-term-rental demand in the southern end of the county. Owners of parcels adjacent to the forest should check the zoning district and any recorded easements, and contact the Mount Rogers Ranger District for any question involving access, boundary, or adjacent-use coordination.
• Hungry Mother State Park adjacency (Virginia DCR State Parks) — Hungry Mother State Park, immediately north of the Town of Marion, is one of the original six Virginia state parks (established 1936 by the Civilian Conservation Corps) and comprises approximately 2,200 acres centered on the 108-acre Hungry Mother Lake. The park is a significant regional recreational destination and drives meaningful short-term-rental demand in Marion-adjacent and park-adjacent unincorporated areas. State-park land is state-administered and outside county zoning, but adjacent private parcels face scenic, access, and ADU-economics considerations that are often favorable for short-term-rental strategies. The park hosts the annual Hungry Mother Arts & Crafts Festival which draws substantial visitor volume each July. Parcels immediately adjacent to the park may be subject to specific deed restrictions or scenic easements (DCR occasionally acquires scenic or conservation easements on adjacent private lands); owners should check recorded easements at the Smyth County circuit clerk's office in Marion.
• Saltville Superfund site and legacy industrial contamination (Olin / Mathieson Alkali Works) — The Saltville area contains a federal Superfund remediation site associated with the former Olin Corporation chemical manufacturing operations (and their Mathieson Alkali Works predecessor) that produced chlor-alkali products, soda ash, and related chemicals at Saltville from the late 19th century through the 1970s. The Saltville Waste Disposal Ponds and associated lands carry institutional controls and environmental-covenant restrictions that materially constrain residential construction on affected parcels, including limitations on groundwater use, soil-disturbance activities, and structure placement. Ponds 5 and 6 and surrounding properties have specific restrictions. Owners of parcels within or adjacent to the Saltville industrial-legacy footprint must check the EPA Superfund record, the Virginia DEQ Office of Remediation records, and any recorded environmental covenants at the Smyth County circuit clerk's office before planning an ADU project. The Town of Saltville itself is the primary permitting authority within town limits (not the county), but the Superfund-related covenants run with the land and apply regardless of whether the parcel is in the town or in the unincorporated county portions of the Saltville Valley.
• Saltville Valley paleontological and archaeological resources — The Saltville Valley contains nationally significant Pleistocene-era paleontological resources — the Saltville Valley is one of the premier Pleistocene megafauna (mammoth, mastodon, giant ground sloth) kill and butchering sites in eastern North America — and significant Native American archaeological resources associated with the prehistoric and historic-era use of the salt licks. These resources are protected under federal and state law where federal permits or funding are involved (e.g., federally funded infrastructure, federal Clean Water Act § 404 permits), and the Virginia Department of Historic Resources maintains a records database of known site locations. A private-parcel ADU project generally does not trigger federal Section 106 review unless a federal permit or funding is involved, but owners of Saltville Valley parcels should be aware of the possibility that ground-disturbing construction may encounter culturally significant material and should consult the Virginia DHR for guidance where a parcel is in a known sensitive area.
• Historic Great Wagon Road / Wilderness Road corridor and individual historic resources — Smyth County lies along the historic Great Wagon Road and Wilderness Road corridor — the principal 18th- and early-19th-century migration route from Philadelphia and the Shenandoah Valley southwestward into Kentucky and Tennessee — and the county contains numerous individually listed historic resources including the Lincoln Theater in Marion (a 1929 Mayan Revival style movie palace listed on the National Register), the Saltville Historic District, the Chilhowie Historic District, and various individual farmstead and agricultural-structure listings. Smyth County does not impose a broad county-wide historic-district overlay on unincorporated parcels that would require Historic Review Board approval for exterior modifications to privately owned non-registered buildings. However, parcels containing individually listed or eligible historic resources, parcels subject to a recorded preservation easement (to the Virginia Department of Historic Resources or a private land trust), and projects involving federal funding or permits (triggering Section 106 review under the National Historic Preservation Act) may face historic-resource review. Owners should check recorded easements and National Register status at the pre-design stage.

The Smyth County Community and Economic Development / Planning Department (for zoning and Special Use Permits) and the Smyth County Building Inspections office (for building, electrical, plumbing, and mechanical permits under the Virginia Uniform Statewide Building Code) share permitting authority over ADU-style projects on unincorporated parcels within the county. Smyth County is approximately 452 square miles in far southwestern Virginia, bisected roughly east-to-west by I-81 and the Middle Fork Holston River. The county is bordered by Bland County and Tazewell County to the north, Wythe County to the east, Grayson County to the south (with the Mount Rogers National Recreation Area on the southern boundary), and Washington County to the west. The incorporated municipalities within Smyth County are the Town of Marion (county seat), the Town of Chilhowie, and the Town of Saltville; parcels within those town corporate limits are permitted by the towns, not the county. Unincorporated communities permitted by the county include Atkins (at the I-81 Exit 54 interchange), Sugar Grove (on the upper Middle Fork Holston River near the Mount Rogers NRA), Groseclose, Adwolfe, Rich Valley (north of Saltville in the upper North Fork Holston watershed), Broadford, Plasterco (historical salt-production community near Saltville), Seven Mile Ford, and numerous rural crossroads communities. For an ADU-style project on an unincorporated parcel, the typical sequence is: (a) pre-application zoning consultation with the zoning administrator to confirm which pathway applies (family-member accessory track, discretionary SUP, or minor subdivision); (b) if an SUP is required, application to the Planning Commission and Board of Supervisors via the statutory public-hearing process; (c) site plan review where required by the zoning district; (d) building permit application to the Building Inspections office; (e) well and septic evaluation by the Virginia Department of Health — Mount Rogers Health District for parcels not served by public utilities (most unincorporated Smyth County parcels are not on public water/sewer); (f) construction inspections; (g) certificate of occupancy. Applicants should expect a materially longer timeline than a first-dwelling build if a Special Use Permit is required, because SUP is a public-hearing process subject to statutory notice under Va. Code § 15.2-2204.