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Rappahannock County permits an 'accessory dwelling' or 'accessory family dwelling' as a supplementary use to a single-family detached dwelling on parcels of sufficient size in the county's Conservation, Agricultural, and primary residential districts, subject to the county's distinctive preservation-oriented standards. The Rappahannock framework follows a more restrictive variant of the Virginia rural-county pattern, reflecting the county's deliberate posture of restricting density to preserve its rural, scenic, and agricultural character: one ADU per parcel; the ADU must be clearly accessory (subordinate in size and use) to a principal single-family dwelling; a base size cap typically more restrictive than peer counties (commonly in the 600-900 square-foot range, materially smaller than the 800-1,200 cap typical in Caroline, Fauquier, or Culpeper); configuration options including attached, interior-conversion, and detached, but with detached subject to scrutiny on visual / scenic impact in the conservation districts that cover much of the county; the ADU must meet the principal-dwelling setbacks for the underlying district rather than reduced accessory-structure setbacks; and the ADU cannot be subdivided off or sold separately from the principal dwelling. Because Virginia has no statewide ADU preemption (see state file stateAduLaw, citing Va. Code § 15.2-2280 et seq. as the local-zoning enabling statute), Rappahannock's ordinance is the authoritative regime on every parcel in the unincorporated county. Confirm the current ordinance text and minimum-lot-size requirements with the Rappahannock County Planning office before relying on a specific size threshold or configuration rule — Rappahannock's preservation-oriented amendments are an active policy area and the ordinance is amended periodically.

Rappahannock County administers an overlay portfolio shaped by its mountainous Blue Ridge geography, federal park lands, and preservation orientation: (1) the Floodplain Overlay District tied to FEMA-mapped Special Flood Hazard Areas along the Hazel River, the Hughes River, the Thornton River, the Rush River, the Rappahannock River (small portion of the eastern county boundary with Culpeper County), and other Blue Ridge-front interior streams; (2) Shenandoah National Park boundary — the entire western boundary of Rappahannock County is the National Park boundary along the Blue Ridge crest, with approximately 25% of the county's land area inside the park; the National Park Service has no zoning authority over private adjacent parcels, but informal scenic-corridor consultation is customary for ridgeline-visible construction; (3) the county's distinctive Conservation district zoning, which is not formally a state-or-federal-mandated overlay but functions as a county-imposed preservation overlay on much of the rural land area, with larger minimum lot sizes, stricter scenic-impact review, and more restrictive accessory-use rules than standard rural districts; (4) historic-resource sensitivity at the Town of Washington National Historic District (the entire small Town of Washington is a National Register district, surveyed and platted by George Washington in 1749 — reportedly the first town surveyed by Washington), at Sperryville Historic District, and at scattered National Register properties across the county; (5) Rappahannock County's role in the Northern Virginia / Shenandoah Valley wine and cider tourism corridor, with several wineries and tasting rooms on agricultural-zoned parcels under Virginia's farm-winery and farm-cidery enabling statutes. Rappahannock is NOT a Tidewater Chesapeake Bay Preservation Area locality — Rappahannock sits in the Northern Piedmont west of the CBPA designation boundary. Rappahannock has no coastal-commission jurisdiction, no CalFire-equivalent WUI regime, and no seismic-retrofit overlay.

• Floodplain Overlay District
• Shenandoah National Park boundary / scenic-corridor coordination
• County Conservation district zoning — preservation overlay function
• Town of Washington Historic District / Sperryville Historic District / Rappahannock County historic resources

The Rappahannock County Building Official issues residential building permits for every parcel in the unincorporated county. Parcels inside the Town of Washington route through the town's own permitting instead. An ADU permit bundle on an unincorporated-county parcel typically includes: (1) a Zoning Compliance verification / Zoning Permit from Planning and Zoning confirming the ADU meets the supplementary-regulation standards (size cap, one-per-parcel, principal-dwelling setbacks, district eligibility, and any Conservation-district scenic-impact considerations), (2) a Building Permit from the Building Official with stamped plans, (3) trade permits for Electrical, Plumbing, and Mechanical filed by licensed Virginia contractors, (4) a Virginia Department of Health construction permit for well and/or septic on essentially every unincorporated-county parcel (Rappahannock's public water/sewer footprint is minimal), (5) a Floodplain Development Permit if any portion of the parcel is within a FEMA-mapped Special Flood Hazard Area along the Hazel River, the Hughes River, the Thornton River, the Rush River, the Rappahannock River (small portion of the eastern county boundary), and other interior streams that drain the Blue Ridge front, (6) for parcels along or visible from Skyline Drive in Shenandoah National Park, possible coordination with the National Park Service for adjacent-lands consultation, and (7) for parcels in the Conservation district, additional review for scenic-corridor and viewshed impact may apply.