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Single Family ResidenceResidential
$677,971$504 / 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 93How 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 $406,487 on Apr 29, 2010

40 WILLIAM ST

NORWALK, CT 06851
3
Beds
1.5
Baths
1,344 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.
0.32 ac
Lot SizeThe size of the land the home sits on, from county records.
1955
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$678K
$632K low$724K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$406,487 · Apr 29, 2010

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,754 (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.$365,560 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$195,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$170,560
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$365,560
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$255,892

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.Ranch
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.1980
Lot (acres)The size of the land the home sits on, from county records.0.32
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.Hot Water
CoolingThe type of cooling or air conditioning in the home.Yes
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.Carport (Unspecified)
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(4)

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 · 0.1 mi
E
Naramake Elementary SchoolC+
Elementary · Grades KG–5 · 0.3 mi
H
Norwalk High SchoolD+
High · Grades 9–12 · 0.5 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

40 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.

  • Costs more per square foot than 77% of homes in Norwalk 06851
  • Smaller than 75% of homes in Western Connecticut County
  • Has a bigger lot than 78% of homes in East Norwalk
  • Older than 69% of homes in Western Connecticut County

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 47% 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$677,971
CheaperTypical $688,258Pricier

Pricier than 47% of homes nearby

Price per ft²$504
CheaperTypical $429Pricier

Pricier than 77% of homes nearby

Living area1,344 ft²
SmallerTypical 1,496 ft²Bigger

Bigger than 38% of homes nearby

Lot size0.32 ac
SmallerTypical 0.29 acBigger

Bigger than 54% of homes nearby

Year built1955
OlderTypical 1960Newer

Newer than 41% of homes nearby

How 40 William St ranks against every home in each area.
MeasureThis homeEast NorwalkNorwalk 06851Western Connecticut County
Estimated valuepricier than$677,97143% of homes47% of homes41% of homes
Price per ft²pricier than$50462% of homes77% of homes67% of homes
Living areabigger than1,344 ft²35% of homes38% of homes25% of homes
Lot sizebigger than0.32 ac78% of homes54% of homes31% of homes
Year builtnewer than195552% of homes41% of homes31% of homes

About 40 William St

How much is 40 William St, Norwalk, CT worth?

The TopHap Estimate for 40 William St, Norwalk, CT is $677,971 as of Sep 24, 2026. The likely range is $632,258 to $723,684. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 40 William St, Norwalk, CT last sell?

40 William St, Norwalk, CT last sold on Apr 29, 2010 for $406,487, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 40 William St, Norwalk, CT?

40 William St, Norwalk, CT has 3 bedrooms, 1.5 bathrooms, 1,344 square feet of living space and a 0.32-acre lot.

When was 40 William St, Norwalk, CT built?

40 William St, Norwalk, CT was built in 1955, making it 71 years old. It is a ranch home. The building has 1 story.

What schools serve 40 William St, Norwalk, CT?

40 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 40 William St, Norwalk, CT compare to other homes in Norwalk 06851?

Among the 8,852 homes in Norwalk 06851, it is worth more than 47% of them ($677,971 against a typical $688,258), its price per square foot is higher than 77% of them ($504 against a typical $429), it is bigger than 38% of them (1,344 ft² against a typical 1,496 ft²), its lot is bigger than 54% of them (0.32 ac against a typical 0.29 ac) and it is newer than 41% of them (1955 against a typical 1960). Measured against all of Western Connecticut County, it is worth more than 41% 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 40 William St, Norwalk, CT?

The 2025 property tax bill for 40 William St, Norwalk, CT was $8,754. The county assessed it at $365,560.

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