21 Union Ave, Onset, MA 02571
Property image
Property image
OFF MARKET

$704,500

Trulia Estimate
  • 4 Beds
  • 3 Baths
  • 1,896 sqft

21 Union Ave, Onset, MA 02571

Onset
Est. Refi. Payment $4,292/mo*
Refinance Your Home

Home Value

Trulia Estimate
$705K
Since last month
Increased$2K (+0.3%)
Since last year
Increased$24K (+3.5%)
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 +89% in the last 10 years
MonthEstimated value
2026
August 2026$705K
July 2026$703K
June 2026$717K
May 2026$694K
April 2026$699K
March 2026$729K
February 2026$695K
January 2026$675K
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
15 6th St, Wareham, MA
0.32
Multi-Family Home
$577,500
10/23/25
5
2.5
1,575
369 Onset Ave, Wareham, MA
0.73
Multi-Family Home
$450,000
02/20/26
4
2
1,488
10 Washington Ave, Bourne, MA
2.14
Multi-Family Home
$355,000
04/21/26
4
2.5
2,151
21 Windsor Dr, Wareham, MA
4.16
Multi-Family Home
$525,000
12/24/25
4
3
2,186
8 Herring Pond Road, Bourne, MA
5.53
Multi-Family Home
$1,000,000
07/23/26
4
4
-

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
25 Union Ave, Wareham, MA 02571
0.02
$435,600
3
1
1,196
Off Market
1 Pearl Ave, Wareham, MA 02571
0.06
$522,300
4
3
1,357
Off Market
24 Union Avenue, Onset, MA 02558
0.07
$628,600
2
2
1,106
Off Market
5 Pearl Ave, Wareham, MA 02571
0.08
$486,200
3
2.5
1,326
Off Market
56 Dots Ln, Onset, MA 02558
0.06
-
2
1
1,050
Off Market
18 Kins Ct, Onset, MA 02558
0.06
-
2
1
800
Off Market
30 Dots Ln, Onset, MA 02558
0.07
-
2
1
875
Off Market
36 Amos Way, Onset, MA 02558
0.07
-
1
1
500
Off Market
12 Beacon St #84, Onset, MA 02558
0.10
$725,000
3
2.5
2,108
Recently Sold
28 Dots Ln, Onset, MA 02558
0.08
$181,000
2
1
710
Recently Sold
50 Kins Ct, Onset, MA 02558
0.08
-
2
1
1,344
Off Market
76 Starboard Dr #76, Wareham, MA 02558
0.10
-
2
2.5
1,900
Off Market

Local Information

  • Map ViewExplore the area around 21 Union Ave.
  • Schools1 Preschool School2 Elementary Schools2 Middle Schools1 High School
  • Shop & Eat
-- mins to
Commute Destination

Home Highlights

Property Type
Multi-Family
Year Built
1939
Living Area
1,896 sqft
Price/Sqft
$372

About this House

Live in one apartment and rent the other or restore this beauty to it's original single family glory. Beautifully located two blocks from Onset Bay and across the street from a school. Hardwood floors, second story deck and covered porch. Downstairs apartment has large bright family room and open kitchen, 2-3 bedrooms and 1.5 bath and stacked laundry. Upstairs apartment is 2 bedroom 1 bath, living room and kitchen with large central hall. Separate gas bills, single electric bill.
21 Union Ave, Onset, MA 02571 is a 4 bedroom, 3 bathroom, 1,896 sqft multi-family in Onset, built in 1939. This property is not currently displayed as for sale or rent on Trulia. The Trulia Estimate is $704,500, with a rent estimate of $3,266/month.

Home Details for 21 Union Ave

Interior Features

Interior Details
BasementCeiling Fan
Heating & Cooling
Heating: GasHeating Fuel: Gas
Levels, Entrance, & Accessibility
Stories: 2Floors: Carpet, Hardwood, Linoleum Vinyl
Appliances & Utilities
Cable ReadyDishwasherDryerRefrigeratorWasher
Windows, Doors, Floors & Walls
Double Paned Windows

Exterior Features

Exterior Home Features
Roof: AsphaltDeckExterior: VinylGardenLawnPorch
Parking & Garage
Parking: Off Street

Property Information

Year Built
Year Built: 1939
Property Type / Style
Property Type: Multi Family

Community

Units in Building: 2

Lot Information

Lot Area: 6970 sqft

Price and Tax history

DateEventPrice
Mar 24, 2021
Source: N/A
ListingRemoved
Oct 14, 2015
Source: N/A
ListingRemoved
$259,000
Jul 16, 2015
Source: N/A
PriceChange
$259,000
Price decreased by 4%
Apr 17, 2015
Source: N/A
Listed For Sale
$270,000

Market trends in Wareham

Last updated July 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
$493K
$9.67KMoM
Sale-to-List Price
100.8%
0.3%MoM
Price per sq ft
$383
$10MoM
Available listings
89
5MoM

Around this home

Neighborhood Overview

Onset
See Local Highlights
Neighborhood stats provided by third party data sources.

What Locals Say about Onset

At least 1 Trulia users voted on each feature.

  • 100 % Say it's walkable to grocery stores

  • 100 % Say yards are well-kept

  • 100 % Say car is needed

  • 100 % Say there's holiday spirit

  • 100 % Say there are sidewalks

  • 100 % Say there's wildlife

  • 100 % Say kids play outside

  • 50 % Say it's walkable to restaurants

Sourced by Trulia users. Learn more about our methodology.
  • ElliceAnn
    "Very walkable, but it would be nice to see more local small shops be welcoming of dogs, even if it was just water bowls/treats outside"
    0
    Flag
  • Trulia User
    "The downtown is quaint with shopping, eating, and laundry. Nearby are art galaries and beautiful beaches! There is so much to do with many planned events throughout the year. "
    4
    Flag
  • Trulia User
    "is a beautiful area to live in surrounded by water. friendly neighborhoods neighbors watch out for each other. great restaurants."
    0
    Flag
  • Trulia User
    "no sidewalks in most spaces for safety. Dogs aren't allowed on beaches. There are some areas they could be reasonably be allowed as long as owners picked up after them. There are parks & grassy areas. little shade. No dog parks. Lots of side streets."
    1
    Flag
  • Patrick S.
    "Summertime activities are the best in Onset. Fireworks on the Fourth of July concerts in the park every Wednesday night and even a kite festivals "
    5
    Flag
  • Ewhite1288
    "I think it’s great for dogs. Plenty of socialization. If they have a dog that is dog or people aggressive not a good neighborhood. "
    2
    Flag

LGBTQ Local Legal Protections

Frequently asked questions about 21 Union Ave

  • What is 21 Union Ave estimated to be worth?
    Trulia's estimated value for 21 Union Ave in Onset, MA is $704,500.
  • Is Onset a buyer's or seller's market?
    Onset is currently a seller's market, based on recent for-sale activity.
  • What's the median sale price in Onset?
    The median sale price in Onset is $493K. That is up $9.67K from the prior month.
  • What are the closest schools to 21 Union Ave?
    The closest schools to 21 Union Ave in Onset, MA are Wareham Elementary School (Pre-K, rated 5/10), Wareham Middle School (Elementary, rated 6/10), Wareham Senior High School (Middle, rated 3/10).
  • Does 21 Union Ave have laundry facilities?
    Yes, 21 Union Ave in Onset, MA has in-unit laundry.
  • Does 21 Union Ave have parking?
    Yes, 21 Union Ave in Onset, MA has on-site parking.

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