ADUs are allowed in HaymarketTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Haymarket, VA
Is your property eligible for an ADU?
# of Properties
58
Owner-occupied
40%
Zoning districts
16
Median Lot Size
0.65 acres
Avg Income
$168,237
Residential Types:
58 housing units
Apts (4+ units)
9%
Condos
67%
Other
24%
Zoning Districts:
798 parcels · 16 districts
R-2
36%(290)
R-1
30%(243)
B-2
13%(100)
B-1
11%(87)
Other
10%(78)
ADU Rules
What can you build in Haymarket, VA?
Haymarket, 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 50% of the finished square footage of the primary dwelling unit
Owner Occupancy
- –Owner or immediate family must occupy the primary dwelling.
Parking
- –1 space per ADU; no max; parking on the same lot as the main dwelling; town-wide Table of Parking Requirements applies; no ADU-specific reductions/waivers.
Rental Restrictions
- –Six-month minimum rental term for ADUs; short-term/vacation rentals prohibited
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