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Single Family ResidenceResidential
$461,878$353 / 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 Aug 30, 2026
Last sold for $400,000 on Jun 15, 2017

21 WILLIAM ST

SPOTSWOOD, NJ 08884
0
Baths
1,308 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.
3,598 ft²
Lot SizeThe size of the land the home sits on, from county records.
1953
Year BuiltThe year the home was originally built, according to county records.

Valuation

$462K
$431K low$492K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$400,000 · Jun 15, 2017

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,013 (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.$211,300 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$91,600
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$119,700
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$211,300
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$211,300

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.0.08
PoolWhether the property has a pool, and what kind, such as in-ground.No

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.

Foreclosure Filings(5)

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

H
Spotswood High SchoolC+
High · Grades 9–12 · 0.8 mi
M
Spotswood Memorial Middle SchoolD
Middle · Grades 6–8 · 0.9 mi
E
G. Austin Schoenly Elementary School
Elementary · Grades PK–1 · 1.2 mi

District: Spotswood Borough School District

Neighborhood · ZIP 08884These 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.101
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.98
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.95

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.20%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.1.9%
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.8,671
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,442 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$106,651
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$126,780
Average tempThe average temperature here across a full year.53°F
Annual precipHow much rain and melted snow falls here in a typical year.48 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.56%

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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 77% of homes in Middlesex County
  • Smaller than 71% of homes in Middlesex County
  • Has a smaller lot than 84% of homes in Spotswood 08884
  • Older than 71% of homes in Spotswood 08884

What homes are worth in Spotswood 08884

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

This home
$185K$912K

This home is worth more than 24% of homes in Spotswood 08884.

How it measures up in Spotswood 08884

The dot is this home. The mark in the middle is the typical home in Spotswood 08884.

Estimated value$461,878
CheaperTypical $565,193Pricier

Pricier than 24% of homes nearby

Price per ft²$353
CheaperTypical $371Pricier

Pricier than 40% of homes nearby

Living area1,308 ft²
SmallerTypical 1,464 ft²Bigger

Bigger than 41% of homes nearby

Lot size3,598 ft²
SmallerTypical 0.23 acBigger

Bigger than 16% of homes nearby

Year built1953
OlderTypical 1957Newer

Newer than 29% of homes nearby

How 21 William St ranks against every home in each area.
MeasureThis homeSpotswood 08884Middlesex County
Estimated valuepricier than$461,87824% of homes23% of homes
Price per ft²pricier than$35340% of homes47% of homes
Living areabigger than1,308 ft²41% of homes29% of homes
Lot sizebigger than3,598 ft²16% of homes27% of homes
Year builtnewer than195329% of homes29% of homes

About 21 William St

How much is 21 William St, Spotswood, NJ worth?

The TopHap Estimate for 21 William St, Spotswood, NJ is $461,878 as of Aug 30, 2026. The likely range is $431,407 to $492,349. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 William St, Spotswood, NJ last sell?

21 William St, Spotswood, NJ last sold on Jun 15, 2017 for $400,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 21 William St, Spotswood, NJ?

21 William St, Spotswood, NJ has 1,308 square feet of living space and a 0.08-acre lot.

When was 21 William St, Spotswood, NJ built?

21 William St, Spotswood, NJ was built in 1953, making it 73 years old.

What schools serve 21 William St, Spotswood, NJ?

21 William St, Spotswood, NJ is assigned to Spotswood High School (high), rated C+; Spotswood Memorial Middle School (middle), rated D; G. Austin Schoenly Elementary School (elementary). All sit in Spotswood Borough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 William St, Spotswood, NJ compare to other homes in Spotswood 08884?

Among the 2,534 homes in Spotswood 08884, it is worth more than 24% of them ($461,878 against a typical $565,193), its price per square foot is higher than 40% of them ($353 against a typical $371), it is bigger than 41% of them (1,308 ft² against a typical 1,464 ft²), its lot is bigger than 16% of them (3,598 ft² against a typical 0.23 ac) and it is newer than 29% of them (1953 against a typical 1957). Measured against all of Middlesex County, it is worth more than 23% 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, Spotswood, NJ?

The 2025 property tax bill for 21 William St, Spotswood, NJ was $8,013. The county assessed it at $211,300.

More homes on William St

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