Google street view image for 21 Elder Rd, Islip, NY 11751

Off market dec 1997 for $240K

$1,011,357

Est. refi paymentEst. refi $1,610/mo

—

•

— ba

•

3,157

sq ft

21 Elder Rd, Islip, NY 11751

About this home

21 Elder Rd is a 3,157 square foot house on a 0.55 acre lot. - it last sold on December 12, 1997 for $240,000. Based on Redfin's Islip data, we estimate the home's value is $1,011,357.

Single-familyProperty Type

1957Year Built

0.55 acresLot Size

$320Est. Price/Sq.Ft.

Source:Public Records

Redfin Estimate

$1,011,357

$771K since sold in December 1997$6,000 since September

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 23.4% lower than the average sale price ($1.32M) of 6 comparable homes.

SOLD JUL 15, 2026
$1,205,000
A
5 beds3.5 baths2,448 sq ft
8 Adelphi St, Islip, NY 11751
Listing by Douglas Elliman Real Estate
SOLD MAY 15, 2026
$999,999
B
4 beds2.5 baths3,087 sq ft
4 Colonial Ct, Bay Shore, NY 11706
Listing by Daniel Gale Sothebys Intl Rlty
SOLD JUL 27, 2026
$2,799,000
C
5 beds5.5 baths4,800 sq ft
10 Beech Rd, Islip, NY 11751
Listing by Compass Greater NY LLC
SOLD JUN 25, 2026
$1,300,000
D
4 beds4 baths3,442 sq ft
39 West Ln, Bay Shore, NY 11706
Listing by Eric G Ramsay Jr Assoc LLC
SOLD OCT 9, 2026
$767,000
E
5 beds2.5 baths1,717 sq ft
22 Manitton Ct, Islip, NY 11751
Listing by Netter Real Estate Inc
SOLD JUL 28, 2026
$855,000
F
3 beds2 baths1,900 sq ft
39 Shebar Dr, Islip, NY 11751
Listing by Howard Hanna Coach

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Earn from this home

Sell

$939,220

Est. take-home

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Refinance

Est. cash available

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Market trends in 11751, NY

Last updated September 2026

Buyer's Market

Seller's Market

Seller's market

Sale-to-List Price

104.2%

+0.6% MoM

Median sale price

$650K

$15K MoM

Avg. days on market

28d

3 days MoM

Recently sold homes

2 MoM

New listings for sale

COMING SOON
$625,000
3 beds1 bath1,025 sq ft
11 Langdon St, Islip, NY 11751
Listing by OverSouth LLC
OPEN SAT, 10AM TO 12PM
$945,000
3 beds3 baths1,964 sq ft
10 Grace Ct, Islip, NY 11751
Listing by Douglas Elliman Real Estate
See all

Provided by Redfin

Sale history for 21 Elder Rd

Year

Property tax

Land + Additions

Assessment*

2021

$19,298

$15,700 + $45,900

$61,600

2020

$19,298 (+5.4%)

$15,700 + $45,900

$61,600

2019

$18,316 (+10.4%)

$15,700 + $44,300

$60,000

2018

$16,586 (+13.9%)

$15,700 + $44,300

$60,000

2017

$14,560 (+0.5%)

$15,700 + $37,600

$53,300

2016

$14,491 (+1.4%)

$15,700 + $37,600

$53,300

2015

$14,285 (+2.6%)

$15,700 + $37,600

$53,300

2014

$13,929 (+3.9%)

$15,700 + $37,600

$53,300

2013

$13,409 (+3.9%)

$15,700 + $37,600

$53,300

2012

$12,901 (+4.2%)

$15,700 + $37,600

$53,300

2011

$12,386 (−16.3%)

$15,700 + $37,600

$53,300

2010

$14,805 (+3.9%)

$15,700 + $49,300

$65,000

2009

$14,251

$15,700 + $49,300

$65,000

Tax history for 21 Elder Rd

Year

Property tax

Land + Additions

Assessment*

2021

$19,298

$15,700 + $45,900

$61,600

2020

$19,298 (+5.4%)

$15,700 + $45,900

$61,600

2019

$18,316 (+10.4%)

$15,700 + $44,300

$60,000

2018

$16,586 (+13.9%)

$15,700 + $44,300

$60,000

2017

$14,560 (+0.5%)

$15,700 + $37,600

$53,300

2016

$14,491 (+1.4%)

$15,700 + $37,600

$53,300

2015

$14,285 (+2.6%)

$15,700 + $37,600

$53,300

2014

$13,929 (+3.9%)

$15,700 + $37,600

$53,300

2013

$13,409 (+3.9%)

$15,700 + $37,600

$53,300

2012

$12,901 (+4.2%)

$15,700 + $37,600

$53,300

2011

$12,386 (−16.3%)

$15,700 + $37,600

$53,300

2010

$14,805 (+3.9%)

$15,700 + $49,300

$65,000

2009

$14,251

$15,700 + $49,300

$65,000

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

Property details

Exterior

Property Information
Living Sq. Ft: 3,157
Ground Floor Sq. Ft: 2,164
Building Sq. Ft: 3,975

Parking & Garage Information
Parking Type: Attached Garage
Garage/Parking Sq. Ft: 462
Garage / Carport Type: Attached

Lot Information
# of Buildings: 1
Land Sq. Ft: 23,958
Legal Lot Number: 12
Legal Block Number: 0002
Municipality Name: ISLIP
Acres: 0.55
Front Footage: 123
Zoning Code: AA
State Use Description: SINGLE FAMILY RESID

Financial

Assessor Information
Assessment Year: 2025

Public facts

Beds: —
Baths: —
Sq. Ft.: 3,157
Stories: —
Lot Size: 0.55 acres
Style: Single Family Residential
Year Built: 1957
Year Renovated: —
County: Suffolk County
APN: 4728890500444000200012000

Home facts updated by county records on Aug 31, 2026

Around this home

Schools

Maud S Sherwood Elementary School

Public 2-5 • Assigned • 0.5mi

5/10

Islip Middle School

Public 6-8 • Assigned • 1.2mi

5/10

Provided by GreatSchools

Lifestyle

Provided by Walk Score and Local Logic

Climate risks

10/10 Flood Factor

Estimated 80%+ chance 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 93° expected this year, 17 days in 30 years

6/10 Wind Factor

70% chance of strong winds in next 30 years

4/10 Air Factor

3 unhealthy days expected this year, 5 days in 30 years

Provided by First Street

Historical weather

Islip, NY • 11751

Average low and high temperatures (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sun exposure

In this area, properties receive around 8.8 hours in June and 4.5 hours in December, which is comparable to the U.S. average for solar exposure.

8.8 hrs

4.5 hrs

JuneDecember

Provided by Shadowmap

Estimated sale price

$951,000 – $1.15M

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Nearby similar homes

$700,000

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Listing by Opendoor Brokerage LLC

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Listing by Douglas Elliman Real Estate

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Listing by Island Edge Homes

New listings for sale in 11751

COMING SOON

$625,000

3 beds1 bath1,025 sq ft

11 Langdon St, Islip, NY 11751

Listing by OverSouth LLC

OPEN SAT, 10AM TO 12PM

$945,000

3 beds3 baths1,964 sq ft

10 Grace Ct, Islip, NY 11751

Listing by Douglas Elliman Real Estate

Home values near 21 Elder Rd

Data from public records.

Address	Redfin Estimate
46 Elder Rd, Islip, NY 4 Beds \| 2.5 Baths \| 2587 Sq. Ft.	$1,907,745
45 Elder Rd, Islip, NY - Beds \| - Baths \| 3310 Sq. Ft.	$1,388,560

Address	Redfin Estimate
17 Elder Rd, Islip, NY - Beds \| - Baths \| 3217 Sq. Ft.	$1,092,940
65 Elder Rd, Islip, NY 4 Beds \| 3 Baths \| 2367 Sq. Ft.	$1,197,623

Address	Redfin Estimate
25 Elder Rd, Islip, NY 3 Beds \| 2.5 Baths \| - Sq. Ft.	$1,074,207
20 Elder Rd, Islip, NY 4 Beds \| 2.5 Baths \| 2083 Sq. Ft.	$896,854

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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 11751, NY

Sale history for 21 Elder Rd

Tax history for 21 Elder Rd

Property details

Around this home

Schools

Lifestyle

Climate risks

Historical weather

Sun exposure

Nearby similar homes

New listings for sale in 11751

Home values near 21 Elder Rd

More real estate resources