Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$570,493$343 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 95How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026
Last sold for $541,000 on Apr 1, 2022

421 SIDNEY ST

MADISON, WI 53703
3
Beds
1
Baths
1,663 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
3,999 ft²
Lot SizeThe size of the land the home sits on, from county records.
1917
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$570K
$541K low$600K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$541,000 · Apr 1, 2022

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,876 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$577,800 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$135,700
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$442,100
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$577,800
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$577,800

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.7 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.34%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Traditional/Old
CountyDane
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1978
Lot (acres)The size of the land the home sits on, from county records.0.09
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Concrete
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.None
CoolingThe type of cooling or air conditioning in the home.Central
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 378 ft²

Transaction History(3)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Lapham Elementary School
Elementary · Grades PK–2 · 0.3 mi
M
O'Keeffe Middle SchoolB-
Middle · Grades 6–8 · 0.8 mi
H
East High SchoolD-
High · Grades 9–12 · 1.0 mi

District: Madison Metropolitan School District

Neighborhood · ZIP 53703These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.167
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.78
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.26

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.39%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.35%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.8%
PopulationHow many people live in this area.40,725
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.21,930 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$49,802
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$85,168
Average tempThe average temperature here across a full year.46°F
Annual precipHow much rain and melted snow falls here in a typical year.34 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.54%

Owner Tools

Do you own this home?
Claim this home

Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

421 Sidney St measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Worth more than 78% of homes in Madison 53703
  • Costs more per square foot than 84% of homes in Dane County
  • Has a smaller lot than 94% of homes in Dane County
  • Older than 93% of homes in Dane County

What homes are worth in Madison 53703

Each bar is how many homes fall in that price range. The marker is this home.

This home
$25K$1.5M

This home is worth more than 78% of homes in Madison 53703.

How it measures up in Madison 53703

The dot is this home. The mark in the middle is the typical home in Madison 53703.

Estimated value$570,493
CheaperTypical $318,466Pricier

Pricier than 78% of homes nearby

Price per ft²$343
CheaperTypical $391Pricier

Pricier than 33% of homes nearby

Living area1,663 ft²
SmallerTypical 1,584 ft²Bigger

Bigger than 54% of homes nearby

Lot size3,999 ft²
SmallerTypical 0.1 acBigger

Bigger than 29% of homes nearby

Year built1917
OlderTypical 1923Newer

Newer than 47% of homes nearby

How 421 Sidney St ranks against every home in each area.
MeasureThis homeTenney-LaphamMadison 53703Dane County
Estimated valuepricier than$570,49373% of homes78% of homes75% of homes
Price per ft²pricier than$34351% of homes33% of homes84% of homes
Living areabigger than1,663 ft²57% of homes54% of homes48% of homes
Lot sizebigger than3,999 ft²30% of homes29% of homes6% of homes
Year builtnewer than191761% of homes47% of homes7% of homes

About 421 Sidney St

How much is 421 Sidney St, Madison, WI worth?

The TopHap Estimate for 421 Sidney St, Madison, WI is $570,493 as of Oct 21, 2026. The likely range is $540,968 to $600,018. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 421 Sidney St, Madison, WI last sell?

421 Sidney St, Madison, WI last sold on Apr 1, 2022 for $541,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 421 Sidney St, Madison, WI?

421 Sidney St, Madison, WI has 3 bedrooms, 1 bathrooms, 1,663 square feet of living space and a 0.09-acre lot.

When was 421 Sidney St, Madison, WI built?

421 Sidney St, Madison, WI was built in 1917, making it 109 years old. It is a traditional/old home. The building has 2 stories.

What schools serve 421 Sidney St, Madison, WI?

421 Sidney St, Madison, WI is assigned to Lapham Elementary School (elementary); O'Keeffe Middle School (middle), rated B-; East High School (high), rated D-. All sit in Madison Metropolitan School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 421 Sidney St, Madison, WI compare to other homes in Madison 53703?

Among the 6,578 homes in Madison 53703, it is worth more than 78% of them ($570,493 against a typical $318,466), its price per square foot is higher than 33% of them ($343 against a typical $391), it is bigger than 54% of them (1,663 ft² against a typical 1,584 ft²), its lot is bigger than 29% of them (3,999 ft² against a typical 0.1 ac) and it is newer than 47% of them (1917 against a typical 1923). Measured against all of Dane County, it is worth more than 75% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 421 Sidney St, Madison, WI?

The 2024 property tax bill for 421 Sidney St, Madison, WI was $9,876. The county assessed it at $577,800.

More homes on Sidney St

Closest homes

More homes in Madison 53703

Assigned schools

Explore the area

See this home in context

Open 421 Sidney St on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map