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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.

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)

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.