Virginia requires localities to allow accessory apartments (a stronger baseline than most of the Southeast); DHCD seals the building.
Building approval
Virginia DHCD — Industrialized Building Safety
Program
Virginia registration seal (USBC) — State insignia/seal program
ADU law
§15.2-2291 baseline; by-right SB 304 (2024) stalled (statewide)
ADU summary
Localities must allow accessory apartments in SF zones; specifics local; by-right reform stalled.
Site / structural drivers
Coastal (Hampton Roads); mountains; 2011 Mineral seismic
Verdict
Statewide accessory-apartment baseline
Get your Virginia permitting roadmap
Tell us your project and we'll send back a parcel-specific permitting roadmap for Virginia — the rules above applied to your lot — plus a real quote, not a range.
General information, current as of 2026 — not legal advice. Confirm specifics with your local jurisdiction.
The Virginia Department of Housing and Community Development (DHCD) under the Industrialized Building Safety Regulations (13 VAC 5-91). A Compliance Assurance Agency reviews and approves the design, conducts the required testing, and the unit receives a Virginia registration seal certifying compliance with the Uniform Statewide Building Code (USBC). With the seal, your local jurisdiction permits the site work — foundation, utilities, zoning — without re-reviewing the structure.
Partly. Va. Code §15.2-2291 requires localities to allow accessory apartments in single-family residential zones, which is a stronger baseline than most states. But localities still set the specifics — size, setbacks, owner-occupancy, design — so the experience varies. A 2024 bill (SB 304) to make ADUs by-right statewide passed the Senate but was sent to the Virginia Housing Commission for study rather than enacted.
Northern Virginia leads. Arlington County has an established accessory-dwelling permit (the AD must share ownership with the main home); Fairfax City permits ADUs within a single-family home and has been working toward allowing detached ADUs; Alexandria and Fairfax County have their own programs. Confirm your specific locality's current ordinance.
It depends on your region. Hampton Roads and the Eastern Shore bring coastal hurricane wind and FEMA flood elevation. The Shenandoah Valley and Blue Ridge bring snow load. And central Virginia carries modest seismic risk — the 2011 Mineral (Louisa County) earthquake was a reminder — so seismic design isn't zero here. PSL Modular sets the spec from your site.
Yes — NoVA's high housing costs make a rentable ADU compelling, and the statewide seal keeps the building out of local plan review. Your work is the locality's ADU standards and the site (foundation, utilities). Turnkey delivery suits tight suburban lots.
PSL Modular units are permittable in all 50 states. Pick yours for the building-approval path, the ADU law, and the structural spec your site needs.