ADU Pass
Alexandria
Alexandria city portion
Also in: Fairfax County · No County
ADU Pass helps homeowners in Alexandria, Alexandria city, Virginia navigate the permit paperwork for building an accessory dwelling unit. This area covers 6 ZIP codes.
Map
ADU details
ADU legality: allowed-with-restrictions
Alexandria operates a by-right ADU pathway after the November 2023 Zoning for Housing reform package. Owner-occupancy was removed, simplifying rental and investor pathways. The principal binding constraint on most Alexandria ADU projects is the historic-district overlay system: the Old and Historic Alexandria District (OHAD, the Old Town local historic overlay) and the Parker-Gray Historic District together cover a substantial fraction of pre-1900 single-family and rowhouse parcels east of Russell Road / South Washington Street. ADUs visible from a public right-of-way within these districts require Board of Architectural Review (BAR) Certificate of Appropriateness, adding 60-120 days. Floodplain Overlay (Potomac waterfront, Four Mile Run, Cameron Run, Holmes Run) and Chesapeake Bay Preservation Area RPA also apply to a meaningful share of waterfront and creek-adjacent parcels.
Cost scenarios
| Scenario | Sq ft | Permit | Build | Total |
|---|---|---|---|---|
| minimum | 200 | $4,800 | $86,000 | $90,800 |
| 600 | 600 | $4,800 | $258,000 | $262,800 |
| maximum | 800 | $4,800 | $344,000 | $348,800 |
Fee breakdown (as of 2026-05)
Permitting process
Viability (permitted uses)
- Long-term rental: yes Long-term rental of an ADU is fully permitted after the November 2023 removal of the owner-occupancy requirement. The Virginia Residential Landlord and Tenant Act (Va. Code Section 55.1-1200 et seq.) governs. Investor-owned non-owner-occupied ADU rentals are expressly permitted under the current Section 7-1500 framework.
- Short-term rental: with-restrictions Alexandria regulates STRs through a separate short-term residential rental ordinance requiring annual registration with the Commissioner of the Revenue and payment of the Alexandria Transient Lodging Tax (currently 6.5% of room receipts). ADU short-term rental is permitted subject to those registration and tax requirements. STR demand is strong - Old Town tourism, federal-business-traveler clientele, and proximity to D.C. support rates roughly 50-80% above the long-term-rental equivalent.
- Office rental: with-restrictions ADU as a standalone commercial office requires home-occupation approval or rezoning; pure commercial leasing of an ADU is not permitted under the residential framework.
- Home office: yes Home occupation is permitted in residential districts subject to Alexandria's standard home-occupation conditions (no walk-in clientele, no exterior signage, no employees other than family residing on the premises).
- Studio / workshop: yes Personal studio (artist, music, woodworking) is a permitted accessory use to an ADU under the residential-use framework. Alexandria's strong arts community (Torpedo Factory Art Center, Del Ray studio fabric) makes this a recurring ADU use case.
- Agriculture: with-restrictions Alexandria is a fully-urbanized independent city with effectively no working-agricultural land base; commercial-scale agriculture is not applicable. Urban-agriculture (community gardens, limited backyard chickens under separate ordinance) is regulated by separate Alexandria provisions.
- Relative support: yes Family / multigenerational accessory dwelling is fully consistent with the by-right Section 7-1500 framework. No family-relationship requirement is imposed.
Contacts
Staff: Zoning Counter (Zoning Administrator / ADU intake) zoning@alexandriava.gov, Code Administration (Building Official)
Utilities
- Water: Virginia American Water (Alexandria service area) · 30d connect · $4,500
- Sewer: AlexRenew (Alexandria Renew Enterprises) for wastewater treatment; City of Alexandria for collection · 35d connect · $6,000
- Electric: Dominion Energy Virginia · 21d connect · $2,400
- Gas: Washington Gas · 21d connect · $1,700
Property values & taxes
Construction timeline
Realistic total: best 9mo · typical 14mo · worst 22mo
Modular pathway inspectors are occasional with modular
Old Town's narrow colonial streets and BAR design constraints typically rule out modular for historic-district parcels; West End and Eisenhower Avenue corridors are modular-feasible. Crane and oversize-permit coordination required from DC-region Pennsylvania factories.
Financing
State ADU loans:
Insurance impact
HOA prevalence & preemption
Virginia has no HOA-ADU preemption. Alexandria has significant HOA / condo-association presence in West End and Eisenhower Avenue corridor; Old Town single-family stock is largely HOA-free but constrained by BAR. Townhouse developments in Cameron Station, Carlyle, and Potomac Yard typically operate under HOA regimes that may further restrict ADU construction.
Regulatory overlays (5)
- historic-district
OHAD is the local historic overlay covering Old Town - the colonial-era core east of approximately Russell Road / Washington Street. The district was designated a National Historic Landmark District in 1966 and is one of the largest contiguous National Register historic districts in the United States. The Old and Historic Alexandria District Board of Architectural Review (BAR) reviews exterior changes visible from a public right-of-way under a Certificate of Appropriateness process. BAR review adds 60-120 days and may impose design conditions on siding material, fenestration, roof pitch and material, and visible mechanical equipment. (map) - historic-district
Parker-Gray is a separate locally-designated historic district covering a multi-block area west of Old Town historically associated with Alexandria's African American community. The district was named for the Parker-Gray School (the segregated-era African American school) and listed on the National Register of Historic Places. The Parker-Gray District BAR reviews exterior changes under a Certificate of Appropriateness process distinct from OHAD. Review adds 60-120 days. (map) - flood-zone
Old Town's eastern waterfront edge (parcels east of Union Street), the Cameron Run corridor along Eisenhower Avenue, the Holmes Run corridor in western Alexandria, and the Four Mile Run corridor at the Arlington County line all carry FEMA SFHA designation. Floodplain Development Permit required for any structure in mapped 100-year floodplain; elevation certificate before AND after construction required (typical $500-$1,500 per certificate). (map) - wetland-overlay
Potomac River frontage parcels (Old Town waterfront east of Union Street, Daingerfield Island area, Jones Point Park area) and tributary-stream-adjacent parcels (Four Mile Run, Cameron Run, Holmes Run, Hooff's Run, Backlick Run) carry RPA designation under Alexandria's Environmental Management Ordinance. Water Quality Impact Assessment required for non-trivial site disturbance within the 100-foot RPA buffer. (map) - airport-noise-zone
DCA is in Arlington County but the airport's approach corridors and Part 150 noise contours extend into northeastern Alexandria, particularly the Potomac Yard / National Landing area. FAA Part 77 imaginary-surface provisions may apply to two-story detached ADUs near the maximum 20-foot height allowance in the affected corridors. (map)
Technical envelope (climate & building code)
Climate & energy code
Building code
Amendments:
- Amendment
- Amendment
Contractor market (aggregate)
Legal history (timeline)
Current ordinance: City of Alexandria Zoning Ordinance Section 7-1500 (Accessory Dwellings), adopted 2021-01-23, last amended 2023-11-28
- 1749-07-13 — Alexandria established as a town by Virginia General Assembly (incorporation)
Alexandria was established by an act of the Virginia General Assembly on July 13, 1749. The town's original 60-acre plat was surveyed by John West with the assistance of 17-year-old George Washington, who was the assistant surveyor. The colonial port town grew around tobacco trade out of the Potomac River deep-water anchorage at Hunting Creek.
Effect: Established the colonial-era street grid (King Street, Cameron Street, Prince Street, Duke Street running east-west; Royal Street, Fairfax Street, Pitt Street, St. Asaph Street, Washington Street running north-south) that today forms the protected core of the Old and Historic Alexandria District. - 1791-03-30 — Alexandria ceded to federal District of Columbia (federal-action)
Alexandria and surrounding Alexandria County were ceded by Virginia to the federal government in 1791 to form part of the District of Columbia. The Residence Act of 1790 had authorized the new federal city.
Effect: Alexandria spent approximately 55 years under federal jurisdiction (1791-1846), during which time the slavery question and trade-disadvantage concerns drove residents to seek retrocession to Virginia. - 1846-07-09 — Retrocession of Alexandria back to Virginia (federal-action)
Congress and Virginia agreed to retrocede the Virginia portion of the District of Columbia (Alexandria County and the City of Alexandria) back to Virginia. The retrocession took effect 1846-09-07 after Virginia's General Assembly accepted.
Effect: Alexandria returned to Virginia jurisdiction. Today's Arlington County and the City of Alexandria together cover the retroceded territory. - 1870-01-01 — Alexandria becomes an independent city under Virginia Constitution of 1870 (incorporation)
The 1870 Virginia Constitution created the modern Virginia 'independent city' as a constitutional category. Alexandria became fiscally and politically separate from the surrounding county.
Effect: Alexandria became an independent city - its own county-equivalent unit of local government - and remains one of Virginia's 38 independent cities today. - 1920-03-16 — Alexandria County renamed Arlington County (state-action)
Virginia renamed the former Alexandria County to Arlington County (after Arlington House / the Robert E. Lee residence) to avoid confusion with the independent City of Alexandria.
Effect: There is no Alexandria County in Virginia today. The City of Alexandria and Arlington County are both independent of each other and both occupy the original retroceded DC territory. - 1966-11-09 — Old Town Alexandria designated National Historic Landmark District (federal-action)
The Old Town Alexandria Historic District was designated a National Historic Landmark in 1966, recognizing the survival of one of the largest contiguous concentrations of 18th- and 19th-century commercial and residential architecture in the United States.
Effect: Cemented historic-preservation framework that today drives Board of Architectural Review constraints on most Old Town ADU projects. - 2021-01-23 — Alexandria City Council adopts initial accessory-dwelling ordinance (Section 7-1500) (city-ordinance)
Alexandria City Council adopted Section 7-1500 of the Zoning Ordinance in January 2021, permitting accessory dwellings city-wide on single-family, townhouse, and duplex properties with administrative permit review. The original policy required owner-occupancy of either the main house or the ADU.
Effect: Made Alexandria one of the first Virginia cities to permit ADUs city-wide; established the administrative-permit pathway and removed the prior Special Use Permit requirement. - 2023-11-28 — Zoning for Housing / Housing for All ordinance package adoption (city-ordinance)
Alexandria City Council voted unanimously to approve the Zoning for Housing / Housing for All ordinance package, the most consequential zoning-reform package in Alexandria's modern history. The package expanded ADU eligibility, EXPRESSLY REMOVED the prior owner-occupancy requirement, rolled back design requirements, raised the height cap from 16 to 20 feet, and broadened by-right permissions across additional property types. The package also created new mixed-residential zoning districts and broadly increased small-scale housing-production capacity throughout the city.
Effect: Alexandria now permits ADUs by-right on essentially all single-family / duplex / townhouse parcels without an owner-occupancy condition; investor-owned ADU rentals are explicitly permitted. Alexandria's framework is materially more permissive than surrounding Northern Virginia jurisdictions and most Virginia independent cities. - 2026-04-14 — Virginia SB531 signed - statewide by-right ADU mandate (state-statute)
Virginia SB531 signed April 14, 2026. Establishes statewide by-right ADU mandate effective July 1, 2027, with $500 fee cap and a January 1, 2026 grandfather clause for pre-existing local ordinances.
Effect: Alexandria's existing Section 7-1500 framework was adopted long before the January 1, 2026 grandfather date and is grandfathered. Alexandria's standards already exceed the SB531 floor; no Alexandria ordinance changes required by SB531.
Known issues (4)
- other — Total project timeline extends to 14-22 months on historic-district parcels; design-development costs higher due to BAR pre-application and revision rounds. BAR-experienced architectural fees run 1.3x-1.5x typical residential design rates.
- other — Build cost runs roughly 80-100% above the Virginia statewide average; expect 4-6 month GC waitlists for established residential builders, longer for BAR-experienced firms. Inner-NoVA construction-cost index runs approximately 1.8x-2.0x the Virginia statewide baseline.
- other — Elevation certificates ($500-$1,500 each, before and after construction), elevated-foundation construction in V/VE zones, and floodplain compliance review recur on projects in affected corridors. Substantial-improvement review can force full NFIP compliance on the existing primary dwelling.
- other — The AlexRenew facility charge frequently exceeds the entire local-permit stack and is the biggest fee surprise for first-time ADU applicants in Alexandria. Request the current facility-charge schedule directly from AlexRenew before pricing.
City of Alexandria — county ADU rules and overlays
County ADU ordinance
The City of Alexandria operates one of the MOST PERMISSIVE accessory-dwelling-unit frameworks in Virginia, materially more enabling than the surrounding Hampton Roads and most Northern Virginia jurisdictions. Section 7-1500 of the Zoning Ordinance, originally adopted January 23, 2021 and substantially expanded by the Zoning for Housing / Housing for All package on November 28, 2023, permits accessory dwellings by-right city-wide on every single-family detached, single-family semi-detached (duplex), and townhouse parcel through an administrative permit pathway - NO Special Use Permit, NO Planning Commission hearing, and NO City Council hearing required for the standard case. Key Section 7-1500 standards: (1) one accessory dwelling per principal dwelling (units-per-lot = 1 plus the principal); (2) maximum gross floor area is the GREATER of 350 sqft (or 500 sqft on larger lots) or one-third of the principal dwelling's gross floor area, with hard cap typically reached at 800 sqft on the typical Alexandria lot; (3) maximum building height for a detached accessory dwelling is the LESSER of the principal dwelling's height OR 20 feet (raised from 16 feet in the November 2023 amendment); (4) setbacks of 1 foot from side and rear lot lines (with no windows or doors), 3 feet if any windows or doors face the lot line, 5 feet if accessory-dwelling height exceeds 16 feet; (5) NO owner-occupancy requirement (this is the single biggest departure from typical Virginia practice - Alexandria EXPRESSLY REMOVED the owner-occupancy condition in the November 2023 amendment, making investor-owned ADU rentals fully permitted); (6) maximum three occupants in the accessory dwelling regardless of unit size or bedroom count; (7) NO additional off-street parking required (the city does not impose a parking-replacement burden on the accessory dwelling); (8) accessory dwellings created through internal conversion (basement apartment, garage conversion, attic build-out) follow the same dimensional and procedural standards. The accessory-dwelling pathway is available in all residential districts including R-20 / R-12 / R-8 / R-5 / R-2-5 / RA / RB / RC / RCX / RD / RM / RT / RS-8 (and the equivalent post-2023 reform district names where the Zoning for Housing package created new mixed-residential classifications). The principal binding constraint on most Alexandria ADU projects is the historic-district overlay system - Old Town and Parker-Gray together cover a substantial fraction of single-family parcels east of Russell Road / South Washington Street, and ADUs visible from a public right-of-way within these districts require Board of Architectural Review (BAR) Certificate of Appropriateness, which adds 60-120 days and constrains exterior design (siding material, fenestration, roof pitch). Outside historic districts, the administrative-permit pathway typically clears within 30-60 days.
County regulatory overlays
The City of Alexandria administers several overlay regimes that bear materially on ADU projects. Despite Alexandria's relative geographic compactness (15.5 sq mi), the overlay density is high because of (a) the extensive historic-district fabric inherited from the city's pre-Revolutionary colonial-port origins, (b) Potomac River frontage triggering Chesapeake Bay Preservation Act jurisdiction, (c) FEMA Special Flood Hazard Area coverage on Potomac waterfront and tributary-creek parcels, and (d) federal-land adjacency (George Washington Memorial Parkway, Daingerfield Island, U.S. Patent and Trademark Office complex). The relevant overlays are: (1) Old and Historic Alexandria District (OHAD) - the Old Town local historic overlay, one of the largest contiguous local historic districts in the United States and a National Historic Landmark District since 1966; (2) Parker-Gray Historic District - a separate locally-designated district covering the area historically associated with Alexandria's African American community, west of Old Town; (3) Floodplain Overlay tied to FEMA Special Flood Hazard Areas along the Potomac waterfront, Four Mile Run, Cameron Run, and Holmes Run; (4) Chesapeake Bay Preservation Area Resource Protection Area (RPA) and Resource Management Area (RMA) under the city's Environmental Management Ordinance, with RPA buffers along the Potomac River and tributary streams; (5) Airport Approach / AICUZ-adjacent overlays affecting the National Landing / Potomac Yard area near Reagan National Airport (DCA) in adjacent Arlington County (DCA is in Arlington County, not Alexandria, but flight paths and noise contours extend into northeastern Alexandria); (6) Daingerfield Island / GW Parkway federal-adjacency review for any project with viewshed or NPS-coordination implications; (7) the Eisenhower Avenue / Cameron Run corridor floodway, where construction is sharply restricted regardless of standard floodplain rules. Alexandria has NO California-style coastal commission (Virginia has no coastal-commission analog; coastal regulation flows through the CBPA), NO CalFire-equivalent WUI regulatory overlay (urban Alexandria has effectively no wildfire exposure), and NO seismic-retrofit overlay.
- Old and Historic Alexandria District (OHAD) - National Historic Landmark District and local historic overlay
- Parker-Gray Historic District
- Floodplain Overlay - FEMA Special Flood Hazard Area along Potomac waterfront, Four Mile Run, Cameron Run, and Holmes Run
- Chesapeake Bay Preservation Area (Environmental Management Ordinance): Resource Protection Area and Resource Management Area
- Reagan National Airport (DCA) approach-corridor and AICUZ-adjacent overlay - northeastern Alexandria
- Federal historic-preservation adjacency - George Washington Memorial Parkway, Daingerfield Island, Jones Point Park, Mount Vernon (adjacent)
County permitting (unincorporated parcels)
The City of Alexandria's Department of Planning and Zoning handles zoning review, administrative accessory-dwelling permits, BAR-coordination intake for historic districts, Chesapeake Bay Preservation Area / RPA-RMA delineation, Floodplain Development Permits, and special-use-permit case management. The Department of Code Administration issues building permits and trade permits. Because Alexandria is an INDEPENDENT CITY (county-equivalent), there is no separate county to coordinate with - the city is its own permitting authority for all matters that would in a typical state involve both city and county. A typical ADU permit bundle in Alexandria includes: (1) an Administrative Accessory Dwelling Permit under Section 7-1500 (or, only if the parcel is non-conforming or requires variance, a Board of Zoning Appeals special exception), (2) BAR Certificate of Appropriateness if the parcel is within the Old Town Historic District / Old and Historic Alexandria District (OHAD) or the Parker-Gray Historic District and exterior elements would be visible from a public right-of-way, (3) a Building Permit with stamped residential plans, (4) Electrical, Plumbing, and Mechanical trade permits, (5) Alexandria Renew Enterprises (AlexRenew) sewer-connection review and Virginia American Water service connection (the city is fully on public water and sewer; there are no private wells or septic systems within city limits), (6) a Floodplain Development Permit if any portion of the parcel is within the mapped Special Flood Hazard Area - which applies to a meaningful fraction of waterfront parcels along the Potomac River, Four Mile Run, Cameron Run, and Holmes Run, (7) a Chesapeake Bay Preservation Act Resource Protection Area review where applicable - Alexandria IS a Tidewater locality, but RPA buffers are narrower in practice than in the coastal-plain Hampton Roads cities because the Potomac River frontage is largely already developed with bulkhead and seawall infrastructure that predates CBPA designation, (8) for federally-connected projects (Section 106 historic-preservation review if federal funding or federal permits are involved, especially relevant near George Washington Memorial Parkway, Daingerfield Island, and the Old Town National Historic Landmark District), and (9) Virginia Department of Historic Resources coordination for state-investment-tax-credit historic-rehabilitation projects involving the primary dwelling.
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 Codes
- 22301
- 22302
- 22304
- 22305
- 22311
- 22314
Post Office
- 1100 Wythe St, 22314
- 1908 Mount Vernon Ave, 22301
- 2226 Duke St, 22314
- 368 S Pickett St, 22304
- 3682 King St, 22302
- 5221 Franconia Rd, 22310
- 6137 Lincolnia Rd, 22312