Google street view image for 18 Horsemill Rd, Water Mill, NY 11976

Off Market Feb 1990 for $495K

—

Est. refi paymentEst. refi $3,015/mo

•

4 ba

•

4,194

sq ft

18 Horsemill Rd, Water Mill, NY 11976

About this home

18 Horsemill Rd is a 4,194 square foot house on a 0.97 acre lot with 4 bedrooms and 4 bathrooms. - it last sold on February 05, 1990 for $495,000.

Single-familyProperty Type

1991Year Built

0.97 acresLot Size

$118Price/Sq.Ft.

Source:Public Records

Redfin Estimate

Unfortunately, we don't have enough data to generate an accurate Estimate at this time.

Earn from this home

Rent

$4,492/mo

Redfin rental estimate

List your home for rent

Market trends in 11976, NY

Last updated August 2026

Buyer's Market

Seller's Market

Buyer's market

Sale-to-List Price

93.9%

+0.4% MoM

Median sale price

$3.6M

$799 MoM

Avg. days on market

62d

0 days MoM

Recently sold homes

2 MoM

Provided by Redfin

Sale history for 18 Horsemill Rd

Year

Property tax

Land + Additions

Assessment*

2024

$13,229

$2,218,900 + $1,026,800

$3,245,700

2023

$13,229 (+1.2%)

$2,218,900 + $1,026,800

$3,245,700

2022

$13,071

$2,218,900 + $1,026,800

$3,245,700

2021

$13,071 (+0.8%)

$2,218,900 + $1,026,800

$3,245,700

2020

$12,967 (−1.9%)

$2,335,700 + $1,031,000

$3,366,700

2019

$13,214 (−4.4%)

$2,335,700 + $1,031,000

$3,366,700

2018

$13,828 (−1.0%)

$2,335,700 + $949,900

$3,285,600

2017

$13,963 (−2.9%)

$2,335,700 + $949,900

$3,285,600

2016

$14,377 (−4.7%)

$2,335,700 + $949,900

$3,285,600

2015

$15,086 (+1.0%)

$2,335,700 + $949,900

$3,285,600

2014

$14,936 (+1.1%)

$2,335,700 + $949,900

$3,285,600

2013

$14,776 (+4.6%)

$2,335,700 + $949,900

$3,285,600

2012

$14,125 (+1.9%)

$2,335,700 + $949,900

$3,285,600

2011

$13,863 (−0.9%)

$2,335,700 + $949,900

$3,285,600

2010

$13,990 (−0.8%)

$2,335,700 + $949,900

$3,285,600

2009

$14,096

$2,335,700 + $949,900

$3,285,600

Tax history for 18 Horsemill Rd

Year

Property tax

Land + Additions

Assessment*

2024

$13,229

$2,218,900 + $1,026,800

$3,245,700

2023

$13,229 (+1.2%)

$2,218,900 + $1,026,800

$3,245,700

2022

$13,071

$2,218,900 + $1,026,800

$3,245,700

2021

$13,071 (+0.8%)

$2,218,900 + $1,026,800

$3,245,700

2020

$12,967 (−1.9%)

$2,335,700 + $1,031,000

$3,366,700

2019

$13,214 (−4.4%)

$2,335,700 + $1,031,000

$3,366,700

2018

$13,828 (−1.0%)

$2,335,700 + $949,900

$3,285,600

2017

$13,963 (−2.9%)

$2,335,700 + $949,900

$3,285,600

2016

$14,377 (−4.7%)

$2,335,700 + $949,900

$3,285,600

2015

$15,086 (+1.0%)

$2,335,700 + $949,900

$3,285,600

2014

$14,936 (+1.1%)

$2,335,700 + $949,900

$3,285,600

2013

$14,776 (+4.6%)

$2,335,700 + $949,900

$3,285,600

2012

$14,125 (+1.9%)

$2,335,700 + $949,900

$3,285,600

2011

$13,863 (−0.9%)

$2,335,700 + $949,900

$3,285,600

2010

$13,990 (−0.8%)

$2,335,700 + $949,900

$3,285,600

2009

$14,096

$2,335,700 + $949,900

$3,285,600

*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.

Property details

Interior

Basement Information
Basement Type: Full

Bathroom Information
# of Full Baths: 4

Heating & Cooling
Air Conditioning Type: Central
Heating Fuel Type: Electric
Heating Type: Hot Air

Fireplace Information
# of Fireplaces: 1
Has Fireplace

Exterior

Exterior Information
Physical Condition: Average
Building Style Type: Colonial
Building Construction Quality: Good
Exterior Wall: Wood
Building Type: Single Family

Pool Information
Pool Type: Gunite
Has Pool

Property Information
Living Sq. Ft: 4,194
Ground Floor Sq. Ft: 2,206
Building Sq. Ft: 4,194
# of Stories: 2
Legal Description: '91 GUN PL FIN +1200

Lot Information
# of Buildings: 1
Land Sq. Ft: 42,253
Legal Lot Number: 15
Legal Block Number: 1
School Tax District: SOUTHHAMPTON
Municipality Name: SOUTHAMPTON
Acres: 0.97
Zoning Code: R80
State Use Description: SINGLE FAMILY RESID

Utility Information
Sewer Type: Private
Water Service Type: Private
Utility Type: Electric

Financial

Assessor Information
Assessment Year: 2025

Public facts

Beds: 4
Baths: 4.0
Sq. Ft.: 4,194
Stories: 2.0
Lot Size: 0.97 acres
Style: Single Family Residential
Year Built: 1991
Year Renovated: —
County: Suffolk County
APN: 0900116000100015000

Home facts updated by county records on Aug 31, 2026

Around this home

Schools

Southampton Intermediate School

Public 5-8 • Assigned • 3.5mi

6/10

Southampton High School

Public 9-12 • Assigned • 3.3mi

7/10

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

4/10 Heat Factor

7 days above 90° expected this year, 20 days in 30 years

8/10 Wind Factor

80% chance of strong winds in next 30 years

3/10 Air Factor

3 unhealthy days expected this year, 3 days in 30 years

Provided by First Street

Historical weather

Water Mill, NY • 11976

Average low and high temperatures (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sun exposure

92/ 100

Exceptional sunlight

Sunscore

This home ranks in the top 29% for direct sun exposure in the zip code. There appears to be minimal shading by surrounding buildings, terrain, and vegetation.

9.9 hrs

5.7 hrs

JuneDecember

Provided by Shadowmap

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Home values near 18 Horsemill Rd

Data from public records.

Address	Redfin Estimate
39 Horsemill Rd, Water Mill, NY 2 Beds \| 2 Baths \| 2156 Sq. Ft.	$3,034,238
61 Summerfield Ln, Water Mill, NY 5 Beds \| 3 Baths \| 3481 Sq. Ft.	$6,044,901

Address	Redfin Estimate
73 Summerfield Ln, Water Mill, NY 4 Beds \| 3 Baths \| 2932 Sq. Ft.	$6,160,355
109 Summerfield Ln, Water Mill, NY 5 Beds \| 3 Baths \| 6822 Sq. Ft.	$8,120,642

Address	Redfin Estimate
124 Summerfield Ln, Water Mill, NY 5 Beds \| 4 Baths \| 3804 Sq. Ft.	$6,589,711
90 Summerfield Ln, Water Mill, NY 5 Beds \| 5 Baths \| 3611 Sq. Ft.	$7,274,346

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GreatSchools Ratings provided by GreatSchools.org.

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About this home

Redfin Estimate

Earn from this home

Market trends in 11976, NY

Sale history for 18 Horsemill Rd

Tax history for 18 Horsemill Rd

Property details

Around this home

Schools

Lifestyle

Climate risks

Historical weather

Sun exposure

Nearby similar homes

Home values near 18 Horsemill Rd

More real estate resources