ADUs are allowed in Unincorporated FrederickTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Frederick, VA
Is your property eligible for an ADU?
# of Properties
21,082
Owner-occupied
89%
Zoning districts
33
Avg Home Value
$392,901
Median Lot Size
0.23 acres
Avg Income
$110,038
Residential Types:
21,082 housing units
Single Family
100%
Zoning Districts:
48,649 parcels · 33 districts
RP
37%(18,078)
RA
36%(17,339)
R5
19%(9,113)
R4
4%(2,038)
Other
4%(2,081)
ADU Rules
What can you build in Unincorporated Frederick, VA?
Unincorporated Frederick, VA follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: By Right
- –Detached ADU: By Right
Max Units
- –Single-family: 1 ADU/lot
- –Duplex & multifamily: none specified
- –Business/industrial: 1 ADU/lot
Owner Occupancy
- –No owner-occupancy requirement.
ADU State Law
What can you build in Virginia?
- –Virginia does not have a statewide ADU mandate; ADU rules are set by individual municipalities.
- –Building/fire codes are set statewide, but whether an ADU is allowed is local zoning.
- –SB 304 would have mandated ADUs. It passed the Virginia Senate in 2024 but was continued/left in House committee (i.e., not enacted statewide)
What's allowed on your lot?
These are the municipality-wide rules. What's allowed on a specific property also depends on state laws, setbacks, floor area ratio, lot coverage, environmental constraints, topography, and other property-specific factors. Search your address on FutureLot to see what's allowed on your property.
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Is your property eligible for an ADU?
ADU rules in other Virginia municipalities
Rules change at the town line. Check the municipality your property is actually in.
Frederick County