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Single Family ResidenceResidential
$943,881$319 / 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 94How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $525,000 on Apr 3, 2008

25 WILLIAM ST

NORWALK, CT 06851
4
Beds
2.5
Baths
2,963 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.
0.36 ac
Lot SizeThe size of the land the home sits on, from county records.
1811
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
9
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$944K
$889K low$999K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$525,000 · Apr 3, 2008

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$12,938 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$540,280 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$183,460
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$356,820
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$540,280
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$378,196

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.Colonial
CountyWESTERN CONNECTICUT
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.1969
Lot (acres)The size of the land the home sits on, from county records.0.36
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Steam
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, Attached
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.Deck

Transaction History(2)

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.

M
Nathan Hale Middle SchoolC+
Middle · Grades 6–8 · 0.2 mi
E
Naramake Elementary SchoolC+
Elementary · Grades KG–5 · 0.4 mi
H
Norwalk High SchoolD+
High · Grades 9–12 · 0.6 mi

District: Norwalk School District

Neighborhood · ZIP 06851These 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.86
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.111
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.90

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.24%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.4%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.9%
PopulationHow many people live in this area.31,871
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,096 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$110,256
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$139,232
Average tempThe average temperature here across a full year.52°F
Annual precipHow much rain and melted snow falls here in a typical year.50 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%

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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

25 William 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 89% of homes in Norwalk 06851
  • Costs less per square foot than 96% of homes in East Norwalk
  • Bigger than 94% of homes in Norwalk 06851
  • Has a bigger lot than 84% of homes in East Norwalk
  • Among the oldest homes in East Norwalk

What homes are worth in Norwalk 06851

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

This home
$258K$1.3M

This home is worth more than 89% of homes in Norwalk 06851.

How it measures up in Norwalk 06851

The dot is this home. The mark in the middle is the typical home in Norwalk 06851.

Estimated value$943,881
CheaperTypical $688,258Pricier

Pricier than 89% of homes nearby

Price per ft²$319
CheaperTypical $429Pricier

Pricier than 5% of homes nearby

Living area2,963 ft²
SmallerTypical 1,496 ft²Bigger

Bigger than 94% of homes nearby

Lot size0.36 ac
SmallerTypical 0.29 acBigger

Bigger than 61% of homes nearby

Year built1811
OlderTypical 1960Newer

Older than almost all homes nearby

How 25 William St ranks against every home in each area.
MeasureThis homeEast NorwalkNorwalk 06851Western Connecticut County
Estimated valuepricier than$943,88179% of homes89% of homes59% of homes
Price per ft²pricier than$3194% of homes5% of homes22% of homes
Living areabigger than2,963 ft²93% of homes94% of homes76% of homes
Lot sizebigger than0.36 ac84% of homes61% of homes35% of homes
Year builtnewer than1811almost no homesalmost no homesalmost no homes

About 25 William St

How much is 25 William St, Norwalk, CT worth?

The TopHap Estimate for 25 William St, Norwalk, CT is $943,881 as of Sep 24, 2026. The likely range is $888,605 to $999,157. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 25 William St, Norwalk, CT last sell?

25 William St, Norwalk, CT last sold on Apr 3, 2008 for $525,000, according to the county's recorded deed.

How big is 25 William St, Norwalk, CT?

25 William St, Norwalk, CT has 4 bedrooms, 2.5 bathrooms, 2,963 square feet of living space and a 0.36-acre lot.

When was 25 William St, Norwalk, CT built?

25 William St, Norwalk, CT was built in 1811, making it 215 years old. It is a colonial home. The building has 2 stories.

What schools serve 25 William St, Norwalk, CT?

25 William St, Norwalk, CT is assigned to Nathan Hale Middle School (middle), rated C+; Naramake Elementary School (elementary), rated C+; Norwalk High School (high), rated D+. All sit in Norwalk School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 25 William St, Norwalk, CT compare to other homes in Norwalk 06851?

Among the 8,852 homes in Norwalk 06851, it is worth more than 89% of them ($943,881 against a typical $688,258), its price per square foot is higher than 5% of them ($319 against a typical $429), it is bigger than 94% of them (2,963 ft² against a typical 1,496 ft²), its lot is bigger than 61% of them (0.36 ac against a typical 0.29 ac) and it is newer than almost none of them (1811 against a typical 1960). Measured against all of Western Connecticut County, it is worth more than 59% 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 25 William St, Norwalk, CT?

The 2025 property tax bill for 25 William St, Norwalk, CT was $12,938. The county assessed it at $540,280.

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