21 Bertram St, Islip, NY 11751
Property image
Property image
OFF MARKET

$691,200

Trulia Estimate
  • 5 Beds
  • 2 Baths

21 Bertram St, Islip, NY 11751

Est. Refi. Payment $4,887/mo*
Refinance Your Home
Currently Off Market - Sold Oct 30, 2009 for $265,000

Home Value

Trulia Estimate
$691K
Since last month
Decreased$33K (-4.5%)
Since last year
Decreased$49K (-6.6%)
Since last sale
Increased$426K (+160.8%)
Learn more about this home's value by checking out its Trulia Estimate, the value of nearby homes, and how much similar homes have sold for.

Trulia Estimate

The of this home's value increased by +117% in the last 10 years
MonthEstimated value
2026
September 2026$691K
September 2026$691K
August 2026$724K
July 2026$693K
June 2026$743K
May 2026$701K
April 2026$661K
March 2026$665K
February 2026$710K
January 2026$711K
2025
2024
2023
2022
2021
2020
2019
2018
2017
2016

Comparable sales

These are recently sold homes that have a similar location or other similar features to this home, like bedrooms, bathrooms, and square footage. Get a sense of the expected prices in the area by viewing these homes.
Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
1 Winthrop Street, Islip, NY
0.14
Single-Family Home
$730,000
07/28/26
5
2
2,400
6 Oxford Street, Islip, NY
0.07
Single-Family Home
$720,000
04/30/26
4
2
2,208
49 41st St, Islip, NY
0.27
Single-Family Home
$192,000
10/07/25
4
2.5
2,800
42 Richmond Street, Islip, NY
0.35
Single-Family Home
$550,000
04/07/26
5
2
1,280
1344 Boston Avenue, Bay Shore, NY
0.14
Single-Family Home
$625,000
02/18/26
6
3
2,448
58 39th Street, Islip, NY
0.18
Single-Family Home
$820,000
04/02/26
5
2.5
2,200
1374 Saxon Avenue, Bay Shore, NY
0.26
Single-Family Home
$740,000
08/03/26
4
2
1,658
11 Windsor Street, Islip, NY
0.26
Single-Family Home
$743,500
09/18/26
4
2
1,870
17 Windsor Street, Islip, NY
0.23
Single-Family Home
$610,000
06/22/26
3
1.5
1,000
1291 Boston Avenue, Bay Shore, NY
0.26
Single-Family Home
$811,000
05/19/26
4
2
2,113

Nearby home prices

Get a sense of expected prices in the area by checking the value of nearby homes.
Address
Distance
Price
Bed
Bath
Sqft
Status
23 Bertram St, Islip, NY 11751
0.02
$659,500
4
2
-
Off Market
15 Bertram St, Islip, NY 11751
0.02
$596,500
4
1
1,450
Off Market
12 Weldon St, Islip, NY 11751
0.02
$597,500
3
1
-
Off Market
12 Weldon St, Islip, NY 11751
0.02
$854,100
5
3
3,200
Off Market
22 Bertram St, Islip, NY 11751
0.03
$646,500
Studio
-
-
Off Market
10 Weldon St, Islip, NY 11751
0.03
$739,700
Studio
-
-
Off Market
18 Bertram St, Islip, NY 11751
0.03
$631,400
Studio
-
-
Off Market
13 Bertram St, Islip, NY 11751
0.03
$629,300
Studio
-
-
Off Market
16 Bertram St, Islip, NY 11751
0.04
$625,600
Studio
-
-
Off Market
9 Weldon St, Islip, NY 11751
0.04
$531,500
5
2
1,700
Off Market
8 Weldon St, Islip, NY 11751
0.05
$711,400
5
2
2,500
Off Market
21 Langdon St, Islip, NY 11751
0.05
$676,100
Studio
-
-
Off Market
11 Bertram St, Islip, NY 11751
0.05
$772,500
4
2
2,500
Off Market
19 Langdon St, Islip, NY 11751
0.05
$764,800
4
2.5
1,939
Off Market
7 Weldon St, Islip, NY 11751
0.05
$674,200
Studio
-
-
Off Market
14 Bertram St, Islip, NY 11751
0.05
$622,700
Studio
-
-
Off Market
11 Weldon St, Islip, NY 11751
0.05
$749,400
Studio
-
-
Off Market
9 Bertram St, Islip, NY 11751
0.06
$740,500
5
3
2,100
Off Market
12 Bertram St, Islip, NY 11751
0.06
$613,500
3
1
-
Off Market
15 Langdon St, Islip, NY 11751
0.06
$654,900
Studio
-
-
Off Market

Local Information

  • Map ViewExplore the area around 21 Bertram St.
  • Schools2 Elementary Schools1 Middle School1 High School
  • Shop & Eat
-- mins to
Commute Destination

Home Highlights

Single-Family Home
Built in 1959
97 acre lot

About this House

Huge 5Br, 2Bth, Hi-Ranch. Nice Size Den/Family Room, Laundry Room. House Needs Some Work. 2 Car Garage In Great Cul-De-Sac. Front & Rear Decks.
21 Bertram St, Islip, NY 11751 is a 5 bedroom, 2 bathroom single-family home built in 1959. It last sold for $265,000 on Oct 30, 2009. This property is not currently displayed as for sale or rent on Trulia. The Trulia Estimate is $691,200, with a rent estimate of $4,621/month.

Home Details for 21 Bertram St

Property Information

Year Built
Year Built: 1959
Property Type / Style
Property Type: Single Family Home

Community

Units in Building: 1

Lot Information

Lot Area: 97.00 acres

Price and Tax history

DateEventPrice
Oct 30, 2009
Source: N/A
Sold
$265,000
Mar 7, 2009
Source: Agent Provided
ListingRemoved
$289,000
Feb 11, 2009
Source: Agent Provided
PriceChange
$289,000
Price decreased by 3%
Nov 29, 2008
Source: Agent Provided
PriceChange
$299,000
Price decreased by 6%
Aug 31, 2008
Source: Agent Provided
Listed For Sale
$319,000

Market trends in Islip

Last updated August 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
—
Sale-to-List Price
—
Price per sq ft
—
Available listings
43
7MoM

Around this home

What Locals Say about Islip

At least 118 Trulia users voted on each feature.

  • 90 % Say parking is easy

  • 90 % Say it's dog friendly

  • 88 % Say car is needed

  • 86 % Say there's holiday spirit

  • 85 % Say yards are well-kept

  • 75 % Say people would walk alone at night

  • 73 % Say kids play outside

  • 65 % Say neighbors are friendly

  • 64 % Say it's quiet

  • 63 % Say it's walkable to restaurants

  • 62 % Say streets are well-lit

  • 62 % Say they plan to stay for at least 5 years

  • 59 % Say there are sidewalks

  • 59 % Say it's walkable to grocery stores

  • 59 % Say there's wildlife

  • 49 % Say there are community events

Sourced by Trulia users. Learn more about our methodology.
  • Michellereid2323
    "Family-oriented neighborhood. Main Street is charming, walkable, and dotted with boutiques, cafes, and diners."
    0
    Flag
  • Matt Classie
    "Street fairs, events at Brookwood Hall during holidays. Theres lots to do in the town of Islip. Bats & Brews is a great event."
    0
    Flag
  • Yen160107
    "I have kids that play in the front yard and they step on the dog feces that they left behind. Also I have signs that say “kids at play” but they do not care"
    0
    Flag
  • Trulia User
    "The drive is horrible and the traffic which is 300 feet from your front door is deafening! A ten lane super hwy and that’s what you wake up to at 4:30 am every day ! Or you can take the train a mile away which you can also here every morning blasting it’s way to islip train station . "
    0
    Flag
  • Trulia User
    "Well celebrate almost all the events soccer games good school very friendly neighborhoods good shopping center "
    1
    Flag
  • Jamal G.
    "this neighborhood is a great place to live there are restaurants in the mall nearby good schools and they are also close"
    14
    Flag
  • Stephen B.
    "The taxes are very high here for the school. Bay Shore schools are just as good or better and the taxes are much lower. "
    9
    Flag
  • Michael .
    "Good! I work in the city and take the LIRR. The islip station has free parking and plenty of spaces."
    1
    Flag
  • Monmona
    "you need to have a car to commute around. around. if you live close enough to the Long Island Railroad, then you can walk to the station and take the train from there."
    1
    Flag
  • Fldsetter
    "I grew up here and actually bought my childhood home back after living in another part of the country . Beaches are close , most folks keep there homes well maintained . There are lot of children here and the schools are second to none . I wish the town would replace the roads here , and take better care of there pubic areas ! But let the young folks moving in fight that fight ! "
    1
    Flag
  • Djhafner132
    "5 min to train station.the neighbors are friendly.i am an avid fisherman and two fishing piers are less than a mile away.the streets are well treed and maintained "
    0
    Flag
  • Djhafner132
    "I lived here since 1973.The homes are well kept and neighbors are friendly.the town dock is an easy walk with great fishing the streets are well maintained.All in all a great place to live"
    0
    Flag
  • Djhafner132
    "Parades block parties great fishing close by.great south of montauk location.Great place to raise a family "
    0
    Flag
  • Ricktssf
    "I work locally, so I can walk to work. the train station to NYC is only 4 blocks away. easy commute on the train. "
    2
    Flag
  • G.Greco
    "I've made Islip my home since 1980. Yards are well kept, the streets are maintained, paved and cleaned regularly. The school district is good. It's a good place to live and raise a family. This area south of Montauk is very desirable"
    16
    Flag
  • Tannuramees
    "parades, fairs, shops close by, farmers market, good schools, nice neighborhood, school events, town events"
    1
    Flag
  • Catherine M.
    "I have lived here for 18 years and for the most part it’s a good area. I am not a huge fan of the school district but it’s not horrible either ."
    11
    Flag
  • Stefbartoli
    "Dog friendly neighborhood! People walk their dogs around regularly. Neighbors look out for each other’s pets as well. "
    1
    Flag
  • Tyase930
    "Quiet respectful neighbors. Walking distance to stores. Lots of new businesses and new development s."
    0
    Flag
  • Tony H.
    "I live in this neighborhood for 2 years so far people are very friendly, there's always parking, people walk their dogs at night and exercise regularly. It's pretty cool !!!"
    0
    Flag
  • Fldsetter
    "Crappy roads / rats / compact floresant lights instead of LED ( someone got paid off ) no trees left due to disease , and the town is not planting any ! Highway noise 10 lanes now on Sunrise HWY - RT27 . No plans for a sound wall ??? I guess we are lower class here in Islip . Airplane and helicopters all day and night fly over head ,, isn’t there a bay or ocean they can fly over then go straight up Lakeland Blvd to the airport ???? I will eave as soon as I find a house elsewhere and not in NY "
    0
    Flag
  • Ricktssf
    "I'm 17 years living in Islip. a little great Hamlet along the great South Bay. Town of Islip is much larger, but this is a Suburban area. "
    0
    Flag

LGBTQ Local Legal Protections

Frequently asked questions about 21 Bertram St

  • What is 21 Bertram St estimated to be worth?
    Trulia's estimated value for 21 Bertram St in Islip, NY is $691,200.
  • What is the price history for 21 Bertram St?
    21 Bertram St in Islip, NY last sold for $265,000 in October 2009.
  • Is Islip a buyer's or seller's market?
    Islip is currently a seller's market, based on recent for-sale activity.
  • What do residents say about Islip?
    Residents describe Islip, NY as easy to park in, dog-friendly, and well-kept. Most residents say you need a car. See recently sold homes in Islip, NY.
  • How big is the lot at 21 Bertram St?
    The lot at 21 Bertram St in Islip, NY is about 97 acres.

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