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Fairfax County is considering zoning changes that would make it easier for homeowners to add accessory living units to their properties—a move county officials say could expand affordable housing options and simplify a process that currently discourages participation.
The proposal would eliminate an existing requirement that property owners live on-site in either the primary residence or the accessory unit, and would revise how the county limits unit size. Currently, accessory living units can be no larger than 1,200 square feet. Under the proposal, units would generally be limited to the smaller of 1,200 square feet or 40% of the main home’s square footage, though county officials could approve larger units in some cases.
Accessory living units can be located inside a house, over a garage, in a basement, as an addition, or in some cases as a detached structure. County officials said potential occupants include older adults, young professionals, caregivers, and extended family members.
“We do see ALUs as a valuable tool in the affordable housing tool kit,” said Casey Judge, deputy zoning administrator for Fairfax County’s Department of Planning and Development.
Judge noted that several other jurisdictions allow accessory living units in duplexes or townhouses, and that state legislation passed recently permits detached units with those dwelling types. However, the county’s proposal does not include allowing accessory living units for townhouses.
The county does not have an exact estimate of how many homeowners would use the proposed changes if approved.
Judge described the broader objective as providing “more housing options, as well as flexibility for different ways to live for our older adults, our young professionals, and caregivers throughout the community.”
The county plans community engagement on the proposal during summer and fall 2026, followed by public hearings later in the year. The Fairfax County Board of Supervisors will make the final decision on whether to approve the changes.