Detached Accessory Dwelling Units
Summary
Detached Accessory Dwelling Units (DADUs) are a proposed addition to Fairfax City's zoning code that would allow property owners to build separate, standalone dwelling units on their lots — distinct from the currently permitted attached or interior ADUs. The topic is grounded in the City's comprehensive plan, which recommends researching ADU expansion while ensuring neighborhood compatibility. The process began with Planning Commission and City Council work sessions in fall 2025 (October 13 and October 28, respectively), where general ADU policy options were explored. Following those sessions, City Council directed staff to draft specific zoning text amendments to permit detached units. Planner Eric Forman presented a detailed draft amendment at a Planning Commission work session on April 13, 2026, covering physical standards such as setbacks (proposed as a middle ground between dwelling and accessory structure standards), height, and square footage. City Council held its own work session in May 2026, at which it requested a formal public hearing and asked for additional analysis on property value impacts — both to the owner's property and to neighboring properties. The public hearing before the Planning Commission was scheduled for June 22, 2026, where proposed amendments to Chapter 110 (Zoning) were taken up; however, no minutes or formal action outcome have been recorded for that meeting yet.
Open questions & options on the table
- The outcome of the June 22, 2026 Planning Commission public hearing has not been recorded — no minutes or action report is available.
- City Council requested additional analysis on property value impacts (effects on the ADU owner's property value and on neighboring properties) before or alongside the public hearing; it is unclear whether that analysis was completed and presented.
- Administration and enforcement details — including how permitting would work, whether rental inspections would be required, and how zoning and code administration would interact — were identified as needing to be worked out before public hearings.
- No formal Planning Commission recommendation or City Council vote on the zoning text amendments has been recorded; the path to adoption remains open.
- The question of what demand for detached ADUs would look like in the first year (with reference to Falls Church's experience as a comparator) was raised but left unresolved.
Recent updates
[5a] Proposed zoning code amendments relating to Detached Accessory Dwelling Units were scheduled for a public hearing at this meeting.
[12a] Policy options for detached ADUs discussed during the work session; no formal action recorded.
What members have said
At the May 12, 2026 City Council work session, Bates expressed interest in how the proposed ADU setback standards compare to those for other accessory structures such as garages, and asked specifically about height guidelines for those structures — indicating support for a standards framework grounded in comparability.
At the April 14, 2026 meeting, Peterson raised a procedural question about the May 5th budget vote structure (single vote vs. two-step), in the context of a broader schedule discussion that included detached ADUs — no substantive position on DADUs recorded.
At the May 12, 2026 City Council work session, Hall indicated a desire to weigh in on the scope of the requested property value analysis before staff (Ms. Johnson) began that work, suggesting a preference for clarity on direction before proceeding.
Positions as recorded in meeting minutes; votes without recorded comment aren’t summarized.
Full history
- Oct 13, 2025Planning Commission · item 8a
[8a] Planner Eric Forman presented a staff report on potential policy options for Detached Accessory Dwelling Units during the work session; discussion was held with no formal action taken.
- Oct 28, 2025City Council · item 12a
[12a] Policy options for detached ADUs discussed during the work session; no formal action recorded.
- Jun 22, 2026Planning Commission · item 5a
[5a] Proposed zoning code amendments relating to Detached Accessory Dwelling Units were scheduled for a public hearing at this meeting.