ADU Pass
Louisa
No County portion
Also in: Louisa County
ADU Pass helps homeowners in Louisa, No County, Virginia navigate the permit paperwork for building an accessory dwelling unit. This area covers 1 ZIP code.
Map
ADU details
ADU legality: allowed-with-restrictions
ADUs permitted in both Town of Louisa (under town zoning ordinance Chapter 165) and the surrounding Louisa County A-1 by-right. Town parcels benefit from public water and sewer (Town of Louisa utilities) and a more compact suburban approval process. County parcels require Virginia Department of Health septic and well permits. Post-July 2027 SB531 will impose statewide by-right framework with the $500 permit fee cap.
Cost scenarios
| Scenario | Sq ft | Permit | Build | Total |
|---|---|---|---|---|
| minimum | 200 | $750 | $60,000 | $60,750 |
| midpoint | 600 | $1,250 | $180,000 | $181,250 |
| 1000 | 1,000 | $2,350 | $300,000 | $302,350 |
Fee breakdown (as of 2026-05)
Permitting process
Viability (permitted uses)
- Long-term rental: yes Long-term rental permitted; modest tenant pool from North Anna Nuclear Plant workers, Louisa County government, and Richmond-MSA fringe commuters.
- Short-term rental: with-restrictions Louisa County regulates STRs; Lake Anna lakefront tourism (15 minutes from Louisa town) drives strong STR demand on lake-adjacent parcels but not in town.
- Office rental: no Detached office rental in residential or A-1 districts not generally permitted.
- Home office: yes Home occupation permitted under standard conditions.
- Studio / workshop: yes Personal studio is a normal accessory use.
- Agriculture: yes A-1 zoning broadly permits agricultural accessory uses; Louisa County is one of Virginia's leading horse-breeding counties.
- Relative support: yes Multigenerational ADU is a canonical use case; SB531 post-2027 will further codify family-flexible by-right.
Incentives
Contacts
Utilities
- Water: Town of Louisa municipal water (in-town parcels); private well (unincorporated county parcels) · 21d connect · $2,200 · separate meter required
- Sewer: Town of Louisa municipal sewer (in-town parcels); private septic (county parcels) · 28d connect · $4,200
- Electric: Dominion Energy Virginia (most parcels); Central Virginia Electric Cooperative for some areas · 30d connect · $2,200
- Gas: Propane (no piped natural gas service to Louisa) · 14d connect · $2,000
Property values & taxes
Construction timeline
Realistic total: best 8mo · typical 12mo · worst 18mo
Modular pathway inspectors are occasional with modular
Town of Louisa is served by US Route 33 / I-64 access via Zion Crossroads (8 mi east); modular delivery feasible.
Financing
State ADU loans:
Insurance impact
HOA prevalence & preemption
Town of Louisa is mostly older non-HOA lots; Lake Anna shoreline subdivisions have HOAs but those are 15+ miles north of town.
Regulatory overlays (1)
- other
Northern Louisa County parcels (10 mi from Louisa town) fall within the North Anna NPP 10-mile emergency planning zone, with notification and evacuation-route obligations. Louisa town itself sits ~15 mi south, outside the 10-mile zone but inside the 50-mile ingestion zone.
Technical envelope (climate & building code)
Climate & energy code
Building code
Amendments:
- Amendment
- Amendment
- Amendment
Contractor market (aggregate)
Legal history (timeline)
Current ordinance: Town of Louisa Code Chapter 165 (Zoning) / Louisa County Code Chapter 86, last amended 2024-01-15
- 1742-05-06 — Louisa County established from Hanover County (other)
Louisa County established in 1742; Town of Louisa later designated as county seat.
Effect: Establishes Louisa as the county seat with its own town governance. - 1873-01-01 — Town of Louisa incorporated (Virginia Acts of Assembly Chapter 122, 1872-73) (other)
Town of Louisa formally incorporated under Virginia state law as a chartered town.
Effect: Town of Louisa given separate zoning and ordinance-making authority from Louisa County. - 2018-09-04 — Virginia DHCD Technical Memo on Accessory Dwelling Units under 2018 USBC (state-guidance)
DHCD technical memo clarifying USBC treatment of ADUs.
Effect: Informs both Town of Louisa and Louisa County plan-review treatment. - 2026-04-14 — Virginia SB531 signed by Governor Spanberger (state-law)
Statewide ADU by-right mandate; caps permit fees at $500; effective July 1, 2027.
Effect: May affect both Town of Louisa and Louisa County zoning; A-1 by-right framework likely treated as pre-2026 ordinance grandfathered.
Known issues (2)
- policy-review — Adds upfront due-diligence; town parcels gain access to public water/sewer but face stricter setbacks; county parcels rely on private well/septic with more flexibility on lot use.
- policy-review — Not a permitting barrier but a disclosure consideration.
County: no attribution (synthetic bucket)
No county
This city sits in the state's "no county" bucket — its ADU rules derive directly from state law and city ordinance without a county intermediary. No county-level sections apply.
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.
ZIP Code
- 23170
Post Office
- 204 W Main St, 23093