ADUs are allowed in Unincorporated King WilliamTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated King William, VA
Is your property eligible for an ADU?
# of Properties
8,985
Owner-occupied
53%
Zoning districts
9
Avg Home Value
$251,366
Median Lot Size
2.70 acres
Avg Income
$95,162
Residential Types:
8,985 housing units
Single Family
9%
Apts (4+ units)
5%
Other
86%
Zoning Districts:
10,007 parcels · 9 districts
A-C
67%(6,707)
R-1
24%(2,373)
R-R
5%(548)
B-2
2%(163)
Other
2%(216)
ADU Rules
What can you build in Unincorporated King William, VA?
Unincorporated King William, 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
Interior / Attached ADU Size Limits
- –Maximum size equal to 100% of the primary dwelling’s finished square footage (internal ADU).
- –Maximum size of 50% of the primary dwelling’s finished square footage (attached ADU).
Detached ADU Size Limits
- –Maximum size of 800 sq ft for a detached accessory dwelling unit by right
Max Units
- –1 ADU per parcel (single-family lots)
Owner Occupancy
- –No owner-occupancy required for ADUs
Rental Restrictions
- –Short-term rentals require a county business license; occupancy must be overnight; maximum of six adult guests; no signage; unit must meet building codes and is subject to annual inspection; violations may lead to suspension/cancellation and fines.
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.
Check my propertyHow can we help you?
Get matched with trusted local builders
Understand what's allowed on your property
Learn the key rules and size limits for ADUs
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.
King William County