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Planning Commission reviews final ADU work session; key divisions remain on owner-occupancy and size
Summary
At its Feb. 19 work session the Falls Church Planning Commission accepted staff's revised ADU height-and-setback framework and a 1,000-square-foot gross-area cap as a starting point, but commissioners were divided on owner-occupancy and occupancy limits and requested additional clarifications before the March 5 public hearing.
The Falls Church Planning Commission held its final work session on accessory dwelling units (ADUs) on Feb. 19 and provided guidance to staff ahead of the March 5 public hearing. Commissioners broadly accepted staff's revised height and setback approach for detached ADUs but split on owner-occupancy, occupancy limits and whether some special-use cases should still come to the Planning Commission for review.
Why it matters: ADU policy changes can make it easier for homeowners to add modest rental housing or family units, affecting housing supply, neighborhood character, tree canopy and stormwater outcomes. The commission's guidance will shape the draft zoning text that goes to public hearing.
Key elements of the draft and meeting guidance:
- Height and setbacks: Staff revised its earlier proposal to allow a detached ADU either up to 1 story/15 feet (whichever is less) with a 5-foot side/rear setback, or up to 1.5 stories/20 feet with a 10-foot side/rear setback. Commissioners broadly supported the 5-foot/15-foot option for shorter one-story units and the 10-foot/20-foot option for taller structures, though some favored intermediate foot-by-foot scaling for additional flexibility on mid-height designs.
- Gross floor area (size): Staff proposed a 1,000-square-foot cap. Most commissioners supported the 1,000-square-foot maximum as the starting policy; a minority advocated for larger ADUs tied to the principal dwelling's size (for example, a fraction of the main house up to a higher ceiling) to preserve opportunities for family housing options.
- Owner-occupancy requirement: The city attorney provided a legal opinion recommending against a mandatory owner-occupancy requirement because of unsettled legal risk. Commissioners split. Some favored removing owner-occupancy (citing legal risk and enforcement complexity); several commissioners urged keeping owner-occupancy as a local guardrail to limit absentee ownership and preserve neighborhood character. Commissioners asked staff to note the split and cite the attorney's analysis in the draft ordinance.
- Occupancy maximum: Staff proposed a three-person maximum for ADU occupancy. Commissioners were divided; some supported increasing to four occupants to allow a family with children, while others favored the staff limit as a conservative starting point.
- Special-use permit review and neighbor notification: The draft makes conversions of pre-existing accessory structures that do not meet the proposed setbacks (and ADUs in multifamily districts) subject to a special-use permit. Commissioners generally preferred that special-use permit applications return to the Planning Commission (rather than bypassing it) so the commission can comment before the Board of Zoning Appeals (BZA) acts. Commissioners also asked staff to evaluate neighbor notification triggers for by-right ADUs (for example, when grading or disturbance thresholds are met) so adjacent neighbors are aware of incoming work.
- Trees, grading and addressing: Commissioners asked staff to produce homeowner guidance on tree preservation, disturbance limits and stormwater mitigation tied to ADU construction. On addressing, staff noted that separate postal or emergency-service addresses are possible without separate utilities; commissioners recommended leaving addressing decisions to the homeowner unless a separate address is needed by emergency responders or for rental operations.
Process next steps: Staff will incorporate commissioners'direction and return a revised draft zoning text for public hearing March 5. City Council will receive staff recommendations in March and take final action in April if timelines hold.
Ending: Commissioners asked staff to add clarifying language and cross-references (for example, to existing lot-coverage and rear-yard limits and to the city's grading thresholds), to supply a glossary of acronyms, and to include the city attorney's reasoning about owner-occupancy in the record so Council and the public can see the legal trade-offs discussed at the work sessions.
