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Duplex (2 Units, Any Combination)Residential
Last sold for $475,000 on Nov 23, 2005

121 WILLIAM ST

NORWALK, CT 06851
3
Beds
3 / 2
Baths
2,507 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.
0.31 ac
Lot SizeThe size of the land the home sits on, from county records.
1920
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$475,000 · Nov 23, 2005

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$12,785 (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.$533,920 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$177,580
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$356,340
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$533,920
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$373,744

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Duplex (2 Units, Any Combination)
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.1979
Lot (acres)The size of the land the home sits on, from county records.0.31
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.Garage, Basement
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.

H
Norwalk High SchoolD+
High · Grades 9–12 · 0.5 mi
E
Naramake Elementary SchoolC+
Elementary · Grades KG–5 · 0.5 mi
M
Nathan Hale Middle SchoolC+
Middle · Grades 6–8 · 0.8 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

121 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.

  • Bigger than 88% of homes in Norwalk 06851
  • Has a bigger lot than 78% of homes in East Norwalk
  • Older than 91% of homes in Western Connecticut County

How it measures up in Norwalk 06851

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

Living area2,507 ft²
SmallerTypical 1,488 ft²Bigger

Bigger than 88% of homes nearby

Lot size0.31 ac
SmallerTypical 0.29 acBigger

Bigger than 54% of homes nearby

Year built1920
OlderTypical 1960Newer

Newer than 10% of homes nearby

How 121 William St ranks against every home in each area.
MeasureThis homeEast NorwalkNorwalk 06851Western Connecticut County
Living areabigger than2,507 ft²87% of homes88% of homes66% of homes
Lot sizebigger than0.31 ac78% of homes54% of homes32% of homes
Year builtnewer than192013% of homes10% of homes9% of homes

About 121 William St

When did 121 William St, Norwalk, CT last sell?

121 William St, Norwalk, CT last sold on Nov 23, 2005 for $475,000, according to the county's recorded deed.

How big is 121 William St, Norwalk, CT?

121 William St, Norwalk, CT has 3 bedrooms, 3 bathrooms, 2,507 square feet of living space and a 0.31-acre lot.

When was 121 William St, Norwalk, CT built?

121 William St, Norwalk, CT was built in 1920, making it 106 years old. It is a ranch home. The building has 1 story.

What schools serve 121 William St, Norwalk, CT?

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

How does 121 William St, Norwalk, CT compare to other homes in Norwalk 06851?

Among the 8,852 homes in Norwalk 06851, it is bigger than 88% of them (2,507 ft² against a typical 1,488 ft²), its lot is bigger than 54% of them (0.31 ac against a typical 0.29 ac) and it is newer than 10% of them (1920 against a typical 1960). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 121 William St, Norwalk, CT?

The 2025 property tax bill for 121 William St, Norwalk, CT was $12,785. The county assessed it at $533,920.

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