Falls Church

The City of Falls Church permits accessory dwelling units on single-family residential parcels through a permit pathway that has been progressively liberalized between 2019 and 2023 by the Falls Church City Council as part of the city's broader Affordable Housing zoning agenda. The current framework is more enabling than the surrounding Fairfax County regime (which requires a Special Permit and owner-occupancy condition for accessory dwellings outside the by-right interior-conversion pathway) but less expansive than the City of Alexandria's by-right Section 7-1500 framework. Key Falls Church standards as of the 2023 amendments: (1) one accessory dwelling per principal single-family detached dwelling; (2) accessory dwelling may be attached, internal to the principal dwelling (basement, attic, or interior conversion), or detached on the same parcel; (3) maximum gross floor area is typically the LESSER of approximately 800 square feet or one-third of the principal dwelling's gross floor area on standard residential lots, with provisions for larger ADUs on larger lots through administrative review; (4) detached accessory dwellings must meet the accessory-structure setbacks for the underlying district (typically 5 feet from side and rear lot lines in R-1A and R-1B), with additional setback for two-story configurations; (5) maximum building height for a detached accessory dwelling is typically capped at 18-20 feet measured to the mid-roof or 25 feet to peak depending on the configuration; (6) the city's 2021-2023 amendments REDUCED but did not entirely eliminate the owner-occupancy condition - confirm current language with the Planning Division before pricing a non-owner-occupied ADU pro forma, as the requirement has been a contested item in successive zoning-text amendments; (7) NO additional off-street parking is required for the accessory dwelling under the current ordinance (parking-burden waiver was part of the 2021 reform package, consistent with Falls Church's transit-rich character - East Falls Church Metro and West Falls Church Metro both serve the city's residents); (8) accessory dwellings created through internal conversion (basement apartment, attic build-out) follow a streamlined administrative pathway with shorter review timelines. Permit pathway is administrative through the Department of Development Services Planning Division; Special Exception or Special Use Permit review with Planning Commission and City Council hearing is reserved for non-conforming cases (variance from size, height, or setback), for ADUs in the city's small commercial-residential overlay districts, and for cases involving the West Falls Church redevelopment area or other special-planning zones. Despite Falls Church's small total area (2.2 square miles), the city contains approximately 4,000-5,000 single-family residential parcels eligible for ADU consideration, and the city has actively encouraged ADU adoption as part of its housing-affordability strategy given the city's extremely high baseline home prices (median single-family home value exceeds $1.2 million as of 2025).

The City of Falls Church administers a comparatively LIGHT overlay regime relative to other Virginia independent cities. Despite Falls Church's location in the densely-regulated Northern Virginia region and its CBPA designation as a Tidewater locality, the city's small geographic footprint (~2.2 sq mi), inland location (no tidal water within or directly adjacent to city limits), and absence of large-scale historic-district fabric (the city has no equivalent to Alexandria's Old Town or Parker-Gray BAR overlay) mean the overlay burden on a typical Falls Church ADU project is materially lighter than on a comparable Alexandria, Arlington, or Old Town Fairfax-County project. The relevant overlays are: (1) Chesapeake Bay Preservation Area Resource Protection Area and Resource Management Area along the city's perennial-stream corridors (Tripps Run is the primary RPA-carrying watercourse within Falls Church; Four Mile Run headwaters along the southeastern city boundary and Pimmit Run tributaries along the northern boundary also carry RPA buffer in specific reaches); (2) Floodplain Overlay tied to FEMA Special Flood Hazard Areas along Tripps Run, Four Mile Run headwaters, and Pimmit Run tributaries - applies to a LIMITED set of parcels, with the substantial majority of Falls Church parcels outside the mapped 100-year SFHA; (3) the West Falls Church Economic Development Area and other Special Planning Areas adopted by City Council as part of the city's economic-development strategy - these can impose additional design-review and master-plan-conformance requirements on parcels within the designated areas, including the major redevelopment of the former George Mason High School site at West Falls Church Metro and the Founders Row mixed-use redevelopment; (4) the Falls Church Episcopal Church National Historic Landmark and a small number of individually-listed National Register or local-landmark historic properties scattered throughout the city - the city does NOT operate a BAR-style design-review board for general residential parcels, and historic-preservation coordination is conducted on a property-specific basis through the Falls Church Historical Commission; (5) Airport Approach / AICUZ-adjacent constraints related to Reagan National Airport (DCA) in Arlington County - flight paths and Part 150 noise contours from DCA generally do NOT extend significantly into Falls Church (DCA's main approach corridors run along the Potomac River, not over Falls Church), but Part 77 imaginary-surface height-review may apply to tall structures on the city's eastern edge. Falls Church has NO seismic-retrofit overlay, NO wildland-urban-interface WUI overlay (urban / suburban Falls Church has effectively zero wildfire exposure), and NO Hampton Roads-style coastal-V-zone overlay.

• Chesapeake Bay Preservation Area (Falls Church Zoning Ordinance and Code): Resource Protection Area and Resource Management Area
• Floodplain Overlay - FEMA Special Flood Hazard Area along Tripps Run, Four Mile Run headwaters, Pimmit Run tributaries
• Special Planning Areas - West Falls Church Economic Development Area, Founders Row, and other city-designated mixed-use redevelopment districts
• Individually-listed historic landmarks - Falls Church Episcopal Church National Historic Landmark and select National Register / local-landmark properties
• Reagan National Airport (DCA) Part 77 imaginary-surface review - limited applicability in Falls Church

The City of Falls Church Department of Development Services handles all zoning and building-permit functions for every parcel in the city. Because Falls Church 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 Falls Church includes: (1) an Administrative Accessory Dwelling permit under Chapter 48 Section 48-310 (most projects qualify for the administrative pathway after the 2021-2023 reforms), or in non-conforming cases a Special Exception application to the Planning Commission with City Council approval, (2) a Building Permit with stamped residential plans, (3) Electrical, Plumbing, and Mechanical trade permits, (4) Fairfax Water service-connection review (Fairfax Water provides drinking water to Falls Church under a long-standing wholesale-retail arrangement; meter-set and service-line connection are coordinated through Fairfax Water with city involvement), (5) sewer-connection coordination - this is unusual for Falls Church because the city's wastewater is split between two regional treatment systems: parcels in the city's western and southern drainage basins flow into the DC Water system and are treated at Blue Plains Advanced Wastewater Treatment Plant under a long-standing intergovernmental agreement, while parcels in the city's eastern drainage basin flow into the Arlington County sewer system and are treated at the Arlington Water Pollution Control Plant; the sewer-connection coordination therefore depends on the parcel's gravity-drainage basin, (6) a Floodplain Development Permit ONLY if the parcel falls within the limited FEMA Special Flood Hazard Area along Tripps Run, Four Mile Run, or the Pimmit Run tributaries that cross or border the city - the substantial majority of Falls Church parcels are OUTSIDE the mapped 100-year floodplain, (7) Chesapeake Bay Preservation Act Resource Protection Area review where applicable - Falls Church IS a designated Tidewater locality under the CBPA, but the city's location well inland (no tidal water within or directly adjacent to city limits) means RPA designation applies only to the perennial-stream buffer corridors along Tripps Run, Four Mile Run headwaters, and certain Pimmit Run tributaries, and (8) for properties listed on the National Register of Historic Places or designated as local historic landmarks (the Falls Church Episcopal Church and a small number of other individually-significant properties), historic-preservation consultation through the Falls Church Historical Commission, though the city does not operate a BAR-style design-review board for the general residential parcel.