9150 Union Farm Rd is a 4,065 square foot house on a 6.66 acre lot with 6 bedrooms and 4 bathrooms. - it last sold on June 25, 2021 for $2,600,000. Based on Redfin's Alexandria data, we estimate the home's value is $3,457,078.
Single-familyProperty Type
1857Year Built
6.66 acresLot Size
$850Est. Price/Sq.Ft.
4 spacesParking
Source:Public Records
Redfin Estimate
$3,457,078
$857K since sold in June 2021$12K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 218.9% higher than the average sale price ($1.08M) of 6 comparable homes.
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning
R-2
Residential District, Two Dwelling Units/Acre
The R-2 District provides for single-family detached dwellings and affordable dwelling unit developments and allows other uses that are compatible with the low-density suburban character of the district.
Permitted uses
Include but are not limited to:
Housing-Group
Housing-Single unit
Public service
Property details
Interior
Basement Information
Basement Finish: Partially Finished
Basement Type: Partial
Bathroom Information
# of Full Baths: 4
Heating & Cooling
Heating Fuel Type: No Gas Public/Piped
Heating Type: Baseboard Hot Water/Steam
Fireplace Information
# of Fireplaces: 2
Has Fireplace
Room Information
# of Rooms: 12
Exterior
Exterior Information
Construction Type: Brick
Exterior Wall: Brick
Roof Covering Type: Composition Shingle
Building Type: Single Family
Property Information
Subdivision Name: CLAPP ESTATE
Living Sq. Ft: 4,065
Adjusted Gross Sq. Ft: 4,065
Building Sq. Ft: 4,065
# of Stories: 2.5
Stories Type: 2 1/2
Legal Description: CLAPP ESTATE NEAR MT VERNON WB437-1612
Parking & Garage Information
Parking Type: Detached Garage
Garage/Parking Sq. Ft: 1,240
Garage / Carport Type: Detached
Lot Information
# of Buildings: 1
Land Sq. Ft: 290,253
Legal Lot Number: 10
Municipality Name: MT VERNON
Acres: 6.6633
Zoning Code: R-2
County Use Description: RESID 1 FAM DETACHED
Utility Information
Electricity / Wiring Type: Connected
Sewer Type: Public
Water Service Type: Public
Financial
Assessor Information
Assessment Year: 2026
Tax Area: MT VERNON
Public facts
Beds: 6
Baths: 4.0
Sq. Ft.: 4,065
Stories: 2.5
Lot Size: 6.66 acres
Style: Single Family Residential
Year Built: 1857
Year Renovated: —
County: Fairfax County
APN: 1101 01 0010
Home facts updated by county records on Jul 30, 2026
Around this home
Schools
Washington Mill Elementary School
Public PreK-6 • Assigned • 0.4mi
5/10
Whitman Middle School
Public 7-8 • Assigned • 2.9mi
4/10
Mount Vernon High School
Public 9-12 • Assigned • 1.4mi
2/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
1/10 Fire Factor
Unlikely to be in a wildfire in next 30 years
7/10 Heat Factor
7 days above 104° expected this year, 16 days in 30 years
4/10 Wind Factor
20% chance of strong winds in next 30 years
2/10 Air Factor
1 unhealthy days expected this year, 2 days in 30 years
Provided by First Street
Historical weather
Alexandria, VA • 22309
Average low and high temperatures (°F)
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64
42
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65
79
62
70
48
60
41
47
31
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Feb
Mar
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May
Jun
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Sun exposure
In this area, properties receive around 9.4 hours in
June and 4.3 hours in December, placing it below the
U.S. average for solar exposure.
9.4 hrs
4.3 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$3.29M – $3.98M
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