ADU Pass
James City County
ADU Pass helps homeowners in James City County, Virginia navigate the permit paperwork for building an accessory dwelling unit. We cover 2 cities and 3 ZIP codes in this county.
Map
County ADU details
County ADU ordinance
James City County regulates ADUs under the label 'accessory apartment' in Chapter 24 of the Zoning Ordinance, splitting them into attached (substantially contained within the principal single-family dwelling, capped at 35 percent of the dwelling's floor area) and detached (on the same lot, capped at 50 percent of the accessory structure's floor area). Only one accessory apartment is permitted per single-family dwelling. In some residential districts (e.g., R-6 Low-Density Residential) detached accessory apartments require a special use permit from the Board of Supervisors under section 24-32; in others (e.g., R-8 Rural Residential) attached apartments are permitted by right subject to the same section-24-32 framework. Virginia is a Dillon Rule state and lacks a statewide ADU-preemption statute comparable to California's, so county discretion is broad.
County assessor
Assessment policy: James City County conducts a general reassessment of all parcels every two years. When an ADU or other qualifying improvement is completed between general reassessments, the Real Estate Assessments Division issues a Supplemental Assessment reflecting the added value as of the January 1 valuation date preceding completion. Only material additions — new structures, square-footage expansions, major upgrades — drive a separate reassessment; routine maintenance does not. The supplemental value is added on top of the market-reassessed base at the next general reassessment cycle.
County overlays (3)
- wetland-overlay — ADU siting on waterfront parcels frequently runs into the 100-foot RPA buffer, which can push an otherwise by-right detached accessory apartment into a variance or exception request. Plan early.
- flood-zone — An ADU placed in a SFHA must meet the same elevation standard as the principal dwelling. Combined with the CBPA RPA buffer, waterfront ADU siting can be materially constrained.
- historic-district — Heritage-tourism economy drives significant federal- and state-level oversight of high-visibility parcels, but this is not county-administered. Check federal and state tiers for the controlling rules.
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.