ADUs are allowed in Unincorporated Prince WilliamTypes:Internal
Types:Internal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Prince William, VA
Is your property eligible for an ADU?
# of Properties
18,811
Owner-occupied
42%
Zoning districts
33
Median Lot Size
0.04 acres
Avg Income
$136,549
Residential Types:
18,811 housing units
Apts (4+ units)
2%
Condos
87%
Other
11%
Zoning Districts:
154,946 parcels · 33 districts
RPC
27%(41,167)
R-4
15%(24,013)
A-1
13%(20,647)
R-6
13%(19,991)
Other
32%(49,128)
ADU Rules
What can you build in Unincorporated Prince William, VA?
Unincorporated Prince William, VA follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: Conditional Use Permit
- –Detached ADU: Not addressed in the local bylaw
Interior / Attached ADU Size Limits
- –Internal ADUs (in-home apartments) are not permitted; maximum allowed area is 0 sq ft.
Owner Occupancy
- –Owner-occupancy not required for ADUs
Rental Restrictions
- –Detached ADU cannot be established or rented (no dwelling use).
- –Internal/attached ADU cannot be rented as a separate unit; boarders allowed but no independent living facilities.
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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ADU rules in other Virginia municipalities
Rules change at the town line. Check the municipality your property is actually in.
Prince William County