6401 Union Mill Rd is a 4,106 square foot house on a 5.04 acre lot with 4 bedrooms and 3.5 bathrooms. - it last sold on July 02, 1998 for $495,000. Based on Redfin's Clifton data, we estimate the home's value is $1,288,423.
Single-familyProperty Type
1997Year Built
5.04 acresLot Size
$314Est. Price/Sq.Ft.
1 car garageParking
Source:Public Records
Redfin Estimate
$1,288,423
$793K since sold in July 1998$55K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 20.9% higher than the average sale price ($1.07M) of 5 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-C
WSPO
Residential-Conservation District
The R-C District protects water courses, stream valleys, marshes, forest cover in watersheds, aquifer recharge areas, rare ecological areas, and areas of natural scenic vistas. The R-C District also minimizes impervious surface and protects the quality of water in public water supply watersheds by encouraging open areas for agriculture and large lot single-family subdivisions.
Zone overlays
Water Supply Protection Overlay District
Permitted uses
Include but are not limited to:
Agriculture-Other
Housing-Group
Housing-Single unit
Public service
Property details
Interior
Basement Information
Basement Sq. Ft: 352
Basement Finish: Full
Basement Type: Full Daylight
Bathroom Information
# of Full Baths: 3
# of 1/2 Baths: 1
Heating & Cooling
Heating Fuel Type: Gas Public/Piped
Heating Type: Central
Fireplace Information
# of Fireplaces: 1
Has Fireplace
Room Information
# of Rooms: 11
Exterior
Exterior Information
Construction Type: Wood
Exterior Wall: Aluminum/Brick
Roof Covering Type: Composition Shingle
Building Type: Single Family
Property Information
Subdivision Name: UNION MILL ESTATES
Living Sq. Ft: 4,106
Adjusted Gross Sq. Ft: 3,890
Building Sq. Ft: 4,748
# of Stories: 2
Stories Type: 2
Legal Description: UNION MILL ESTATES II LT 2
Parking & Garage Information
Parking Type: Attached Garage
Garage/Parking Sq. Ft: 506
Garage / Carport Type: Attached
Lot Information
# of Buildings: 1
Land Sq. Ft: 219,621
Legal Lot Number: 2
Municipality Name: SPRINGFIELD
Acres: 5.0418
Zoning Code: RC
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: SPRINGFIELD
Public facts
Beds: 4
Baths: 3.5
Sq. Ft.: 4,106
Stories: 2.0
Lot Size: 5.04 acres
Style: Single Family Residential
Year Built: 1997
Year Renovated: —
County: Fairfax County
APN: 0663 12 0002
Home facts updated by county records on Jul 30, 2026
Around this home
Schools
Union Mill Elementary School
Public PreK-6 • Assigned • 0.4mi
9/10
Liberty Middle School
Public 7-8 • Assigned • 0.7mi
7/10
Centreville High School
Public 9-12 • Assigned • 0.7mi
5/10
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
6/10 Heat Factor
7 days above 104° expected this year, 16 days in 30 years
4/10 Wind Factor
12% 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
Clifton, VA • 20124
Average low and high temperatures (°F)
40
24
45
28
64
41
71
50
74
56
85
65
90
72
82
64
79
61
70
47
59
40
45
28
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 9.4 hours in
June and 4.2 hours in December, placing it below the
U.S. average for solar exposure.
9.4 hrs
4.2 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$1.23M – $1.48M
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