18 Flag Hill Rd is a 2,940 square foot house on a 0.93 acre lot with 3 bedrooms and 2.5 bathrooms. - it last sold on May 30, 1990 for $338,000. Based on Redfin's Chappaqua data, we estimate the home's value is $1,292,457.
Single-familyProperty Type
1979Year Built
0.93 acresLot Size
$440Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$1,292,457
$954K since sold in May 1990$57K since October
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 6.6% lower than the average sale price ($1.38M) 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.
Permits
Nov 19, 2026 • Active
Building
Remove an underground storage tank and install an aboveground storage tank.
Demolition
Nov 19, 2026 • Active
Plumbing
Remove an underground storage tank and install a new aboveground storage tank.
Demolition
Gas
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: 648
Basement Type: Partial
Bathroom Information
# of Full Baths: 2
# of 1/2 Baths: 1
Heating & Cooling
Air Conditioning Type: Central
Heating Type: Hot Water Steam
Fireplace Information
# of Fireplaces: 1
Has Fireplace
Exterior
Exterior Information
Physical Condition: Average
Building Style Type: Contemporary
Exterior Wall: Aluminum/Vinyl
Property Information
Living Sq. Ft: 2,940
Ground Floor Sq. Ft: 1,610
Building Sq. Ft: 2,940
Legal Description: CHAPPAQUA NY 2-87-7
Parking & Garage Information
Parking Type: Basement Garage
Garage / Carport Type: Basement
Lot Information
# of Buildings: 1
Land Sq. Ft: 40,466
Legal Lot Number: 7
Legal Block Number: 2
School Tax District: CHAPPAQUA
Municipality Name: MOUNT PLEASANT
Acres: 0.929
State Use Description: SINGLE FAMILY RESID
Utility Information
Sewer Type: Private
Financial
Assessor Information
Assessment Year: 2025
Public facts
Beds: 3
Baths: 2.5
Sq. Ft.: 2,940
Stories: —
Lot Size: 0.93 acres
Style: Single Family Residential
Year Built: 1979
Year Renovated: —
County: Westchester County
APN: 553489A09901400020070000000
Home facts updated by county records on Sep 25, 2026
Around this home
Schools
K - 12
Preschool & daycare
Some nearby schools may not be within this home's attendance zone. Please check the Chappaqua Central School District website to verify.
Robert E Bell School
Public 5-8 • 1.2mi
9/10
Horace Greeley High School
Public 9-12 • 2.6mi
10/10
Bedford Road School
Public K-4 • 0.7mi
6/10
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 98° expected this year, 13 days in 30 years
5/10 Wind Factor
26% chance of strong winds in next 30 years
4/10 Air Factor
4 unhealthy days expected this year, 6 days in 30 years
Provided by First Street
Historical weather
Chappaqua, NY • 10514
Average low and high temperatures (°F)
34°
22°
37°
23°
54°
34°
63°
43°
71°
53°
82°
63°
86°
68°
82°
62°
78°
59°
66°
48°
55°
39°
40°
26°
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 8.7 hours in
June and 4.3 hours in December, placing it below the
U.S. average for solar exposure.
8.7 hrs
4.3 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$1.23M – $1.49M
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