2820 Union St is a 2,304 square foot townhouse on a 6,769 square foot lot with 3 bedrooms and 2 bathrooms. Based on Redfin's Madison data, we estimate the home's value is $379,389.
TownhomeProperty Type
1922Year Built
6,769 sq ftLot Size
$165Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$379,389
$1,000 since September
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 28.1% lower than the average sale price ($528K) of 6 comparable homes.
As the MLS and public records start to fill up, we'll list the details here.
Year
Property tax
Land + Additions
Assessment*
2025
$6,086 (+14.9%)
$76,400 + $254,700
$331,100
2024
$5,295 (+3.8%)
$76,400 + $227,400
$303,800
2023
$5,101 (−0.5%)
$76,400 + $207,500
$283,900
2022
$5,125 (+6.1%)
$70,700 + $192,200
$262,900
2021
$4,829 (+3.2%)
$67,300 + $161,300
$228,600
2020
$4,677 (+4.7%)
$64,700 + $147,000
$211,700
2019
$4,469 (+3.2%)
$60,500 + $141,100
$201,600
2018
$4,330 (+7.4%)
$60,500 + $135,200
$195,700
2017
$4,032 (+2.1%)
$55,000 + $119,700
$174,700
2016
$3,947 (+4.9%)
$55,000 + $113,000
$168,000
2014
$3,762 (+3.4%)
$49,400 + $105,900
$155,300
2013
$3,638
$47,500 + $101,800
$149,300
Tax history for 2820 Union St
Year
Property tax
Land + Additions
Assessment*
2025
$6,086 (+14.9%)
$76,400 + $254,700
$331,100
2024
$5,295 (+3.8%)
$76,400 + $227,400
$303,800
2023
$5,101 (−0.5%)
$76,400 + $207,500
$283,900
2022
$5,125 (+6.1%)
$70,700 + $192,200
$262,900
2021
$4,829 (+3.2%)
$67,300 + $161,300
$228,600
2020
$4,677 (+4.7%)
$64,700 + $147,000
$211,700
2019
$4,469 (+3.2%)
$60,500 + $141,100
$201,600
2018
$4,330 (+7.4%)
$60,500 + $135,200
$195,700
2017
$4,032 (+2.1%)
$55,000 + $119,700
$174,700
2016
$3,947 (+4.9%)
$55,000 + $113,000
$168,000
2014
$3,762 (+3.4%)
$49,400 + $105,900
$155,300
2013
$3,638
$47,500 + $101,800
$149,300
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning
TR-C4
TOD
Traditional Residential-Consistent 4 District
The TR-C Districts are established to stabilize, protect and encourage throughout the City the essential characteristics of the residential areas typically located on the Isthmus, near East and near West portions of the City, and to promote and encourage a suitable environment for family life while accommodating a full range of life-cycle housing. The districts are also intended to: Promote the preservation, development and redevelopment of traditional residential neighborhoods in a manner consistent with their distinct form and residential character; Ensure that new buildings and additions to existing buildings are designed with sensitivity to their context in terms of building placement, facade width, height and proportions, garage and driveway placement, landscaping, and similar design features; Maintain and improve the viability of existing housing of all types, while providing for updating of older housing in a context-sensitive manner; Maintain or increase compatibility between residential and other allowed uses, and between different housing types, where permitted, by maintaining consistent building orientation and parking placement and screening; Facilitate the preservation, development or redevelopment goals of the comprehensive plan and of adopted neighborhood, corridor or special area plans.
Zone overlays
Transit Oriented Development Overlay District
Permitted uses
Include but are not limited to:
Religious facility
Day care facility
Retail-Grocery
Housing-Group
Housing-Single unit
Public service
Fire house
Police station
Communications tower
Park & open space
Property details
Interior
Basement Information
Basement Sq. Ft: 850
Basement Type: Full
Bathroom Information
# of Full Baths: 2
Exterior
Exterior Information
Physical Condition: Average
Foundation Type: Concrete Block
Building Style Type: Townhouse
Building Construction Quality: Fair
Exterior Wall: Wood
Roof Covering Type: Asphalt
Roof Shape Type: Asphalt
Property Information
Subdivision Name: CLYDE A GALLAGHER
Living Sq. Ft: 2,304
Ground Floor Sq. Ft: 1,152
Building Sq. Ft: 3,154
# of Units: 2
# of Stories: 2
Legal Description: CLYDE A. GALLAGHER REPLAT OF PART OF LOT 113 FARWELLS EASTERN ADDITION LOT 51 & W 7 FT OF LOT 52
Parking & Garage Information
# of Parking Spaces: 1
Parking Type: Detached Garage
Garage/Parking Sq. Ft: 259
Garage / Carport Type: Detached
Lot Information
# of Buildings: 1
Land Sq. Ft: 6,769
Legal Lot Number: 113
Municipality Name: CITY OF MADISON
Acres: 0.1554
County Use Description: RESIDENTIAL
Financial
Assessor Information
Assessment Year: 2025
Public facts
Beds: 3
Baths: 2.0
Sq. Ft.: 2,304
Stories: 2.0
Lot Size: 6,769 square feet
Style: Townhouse
Year Built: 1922
Year Renovated: 1922
County: Dane County
APN: 071005231239
Home facts updated by county records on Oct 5, 2026
Around this home
Schools
Lowell Elementary School
Public PreK-5 • Assigned • 0.6mi
5/10
O'keeffe Middle School
Public 6-8 • Assigned • 1.2mi
8/10
East High School
Public 9-12 • Assigned • 0.7mi
8/10
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
2/10 Heat Factor
7 days above 100° expected this year, 14 days in 30 years
2/10 Wind Factor
Minor risk of severe winds over next 30 years
3/10 Air Factor
2 unhealthy days expected this year, 3 days in 30 years
Provided by First Street
Historical weather
Madison, WI • 53704
Average low and high temperatures (°F)
26
11
35
18
51
31
60
41
70
48
81
62
85
67
78
62
76
57
66
47
47
34
31
18
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 9.8 hours in
June and 3.5 hours in December, placing it below the
U.S. average for solar exposure.
9.8 hrs
3.5 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$361,000 – $437,000
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