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Single Family ResidenceResidential
$897,017$735 / 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

21 WILLIAM ST

WEST NEWTON, MA 02465
3
Beds
2
Baths
1,221 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.
0.19 ac
Lot SizeThe size of the land the home sits on, from county records.
1921
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
7
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$897K
$856K low$938K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,974 (2026)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$926,100 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$848,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$78,100
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$882,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$986,670

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.18
ConstructionThe main material the home's frame and walls are built from.Brick
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Hot Water
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(9)

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
Franklin Elementary SchoolA-
Elementary · Grades KG–5 · 0.4 mi
M
F. A. Day Middle SchoolA+
Middle · Grades 6–8 · 1.2 mi
H
Newton North High SchoolA+
High · Grades 9–12 · 1.6 mi

District: Newton School District

Neighborhood · ZIP 02465These 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.59
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.105
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.74

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.31%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.13,311
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,877 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$170,293
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$229,449
Average tempThe average temperature here across a full year.49°F
Annual precipHow much rain and melted snow falls here in a typical year.47 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

21 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 less than 84% of homes in West Newton 02465
  • Costs more per square foot than 89% of homes in Middlesex County
  • Smaller than 91% of homes in West Newton 02465
  • Has a smaller lot than 68% of homes in Middlesex County
  • Older than 75% of homes in Middlesex County

What homes are worth in West Newton 02465

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

This home
$639K$5.6M

This home is worth more than 16% of homes in West Newton 02465.

How it measures up in West Newton 02465

The dot is this home. The mark in the middle is the typical home in West Newton 02465.

Estimated value$897,017
CheaperTypical $1,300,986Pricier

Pricier than 16% of homes nearby

Price per ft²$735
CheaperTypical $683Pricier

Pricier than 65% of homes nearby

Living area1,221 ft²
SmallerTypical 2,140 ft²Bigger

Bigger than 9% of homes nearby

Lot size0.19 ac
SmallerTypical 0.2 acBigger

Bigger than 45% of homes nearby

Year built1921
OlderTypical 1930Newer

Newer than 37% of homes nearby

How 21 William St ranks against every home in each area.
MeasureThis homeWest Newton 02465Middlesex County
Estimated valuepricier than$897,01716% of homes63% of homes
Price per ft²pricier than$73565% of homes89% of homes
Living areabigger than1,221 ft²9% of homes21% of homes
Lot sizebigger than0.19 ac45% of homes32% of homes
Year builtnewer than192137% of homes25% of homes

About 21 William St

How much is 21 William St, West Newton, MA worth?

The TopHap Estimate for 21 William St, West Newton, MA is $897,017 as of Oct 21, 2026. The likely range is $855,836 to $938,198. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 William St, West Newton, MA last sell?

21 William St, West Newton, MA last sold on Jun 7, 2017, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 21 William St, West Newton, MA?

21 William St, West Newton, MA has 3 bedrooms, 2 bathrooms, 1,221 square feet of living space and a 0.18-acre lot.

When was 21 William St, West Newton, MA built?

21 William St, West Newton, MA was built in 1921, making it 105 years old. The building has 2 stories.

What schools serve 21 William St, West Newton, MA?

21 William St, West Newton, MA is assigned to Franklin Elementary School (elementary), rated A-; F. A. Day Middle School (middle), rated A+; Newton North High School (high), rated A+. All sit in Newton School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 William St, West Newton, MA compare to other homes in West Newton 02465?

Among the 3,799 homes in West Newton 02465, it is worth more than 16% of them ($897,017 against a typical $1,300,986), its price per square foot is higher than 65% of them ($735 against a typical $683), it is bigger than 9% of them (1,221 ft² against a typical 2,140 ft²), its lot is bigger than 45% of them (0.19 ac against a typical 0.2 ac) and it is newer than 37% of them (1921 against a typical 1930). Measured against all of Middlesex County, it is worth more than 63% 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 21 William St, West Newton, MA?

The 2026 property tax bill for 21 William St, West Newton, MA was $8,974. The county assessed it at $926,100.

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