664 Killary Down is a 3,039 square foot house on a 0.71 acre lot with 3 bedrooms and 2.5 bathrooms. Based on Redfin's Weldon Spring data, we estimate the home's value is $1,137,296.
Single-familyProperty Type
2016Year Built
0.71 acresLot Size
$374Est. Price/Sq.Ft.
3 car garageParking
Source:Public Records
Redfin Estimate
$1,137,296
$34K since September
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 97.3% higher than the average sale price ($576K) of 6 comparable homes.
As the MLS and public records start to fill up, we'll list the details here.
Year
Property tax
Land + Additions
Assessment*
2025
$8,783 (+9.6%)
2024
$8,013
2023
$8,010 (−13.9%)
2022
$9,306
2021
$9,315 (−13.7%)
2020
$10,794 (+0.5%)
2019
$10,745 (+2.0%)
2018
$10,536 (+43.1%)
2017
$7,363
Tax history for 664 Killary Down
Year
Property tax
Land + Additions
Assessment*
2025
$8,783 (+9.6%)
2024
$8,013
2023
$8,010 (−13.9%)
2022
$9,306
2021
$9,315 (−13.7%)
2020
$10,794 (+0.5%)
2019
$10,745 (+2.0%)
2018
$10,536 (+43.1%)
2017
$7,363
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Permits
Nov 15, 2016 • Final
Residential new construction - single- multi-family / mobile home / modular
Work on a single-family home.
New construction
Permit history is from public records and may be incomplete or inaccurate. Redfin and its agents make no representations about the property condition or permit status. Buyers should independently verify all information.
Property details
Interior
Basement Information
Basement Sq. Ft: 3,039
Bathroom Information
# of Full Baths: 2
# of 1/2 Baths: 1
Room Information
# of Rooms: 6
Exterior
Exterior Information
Building Style Type: Ranch
Building Construction Quality: Good
Exterior Wall: Brick
Property Information
Subdivision Name: WHITMOOR KILLARY DOWN ADD
Living Sq. Ft: 3,039
Building Sq. Ft: 6,078
# of Stories: 1
Stories Type: 1
Legal Description: WHITMOOR - KILLARY DOWN ADDN LOT 1
Parking & Garage Information
# of Parking Spaces: 3
Lot Information
# of Buildings: 1
Land Sq. Ft: 31,015
Legal Lot Number: 1
School Tax District: FRANCIS HOWELL
Municipality Name: WELDON SPRINGS
Acres: 0.712
County Use Description: SINGLE FAMILY RESID
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 3
Baths: 2.5
Sq. Ft.: 3,039
Stories: 1.0
Lot Size: 0.71 acres
Style: Single Family Residential
Year Built: 2016
Year Renovated: —
County: St. Charles County
APN: 3-0041-C352-00-0001.0000000
Home facts updated by county records on Aug 7, 2026
Around this home
Schools
Independence Elementary School
Public K-5 • Assigned • 2.6mi
10/10
Bryan Middle School
Public 6-8 • Assigned • 2.5mi
9/10
Francis Howell High School
Public 9-12 • Assigned • 5.3mi
10/10
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
5/10 Heat Factor
7 days above 107° expected this year, 20 days in 30 years
2/10 Wind Factor
1% chance of strong winds in next 30 years
2/10 Air Factor
2 unhealthy days expected this year, 2 days in 30 years
Provided by First Street
Historical weather
Weldon Spring, MO • 63304
Average low and high temperatures (°F)
38
21
47
28
67
42
72
51
76
56
86
67
90
72
86
66
85
60
74
51
57
41
47
30
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 9.7 hours in
June and 4.2 hours in December, which is comparable to the
U.S. average for solar exposure.
9.7 hrs
4.2 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$1.08M – $1.31M
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