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Single Family ResidenceResidential
$402,052$421 / 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 Jul 14, 2026
Last sold for $127,000 on Oct 12, 2017

51 WILLIAM ST

SOUTH RIVER, NJ 08882
0
Baths
956 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.
3,202 ft²
Lot SizeThe size of the land the home sits on, from county records.
1951
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$402K
$379K low$425K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$127,000 · Oct 12, 2017
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$246,052
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$196,842
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.43%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$156,000
AMERISAVE MORTGAGE CORP · recorded Mar 25, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,597 (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.$209,700 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$83,600
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$126,100
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$209,700
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$209,700

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.24 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.49%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal

Scores 0–100; higher = greater projected risk.

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.0.07
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.

Foreclosure Filings(10)

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

E
South River Primary School
Elementary · Grades KG–2 · 1.0 mi
M
South River Middle SchoolC-
Middle · Grades 6–8 · 1.0 mi
H
South River High SchoolD
High · Grades 9–12 · 1.1 mi

District: South River Borough School District

Neighborhood · ZIP 08882These 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.104
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 100.101

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.17%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.9%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.6%
PopulationHow many people live in this area.16,718
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,569 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$86,286
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$125,749
Average tempThe average temperature here across a full year.53°F
Annual precipHow much rain and melted snow falls here in a typical year.49 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.56%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Absentee owner
Company ownedWhether the owner is a company or trust rather than a person.No

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

51 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 92% of homes in South River 08882
  • Costs more per square foot than 88% of homes in South River 08882
  • Smaller than 95% of homes in South River 08882
  • Has a smaller lot than 93% of homes in South River 08882
  • Older than 75% of homes in Middlesex County

What homes are worth in South River 08882

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

This home
$338K$935K

This home is worth more than 8% of homes in South River 08882.

How it measures up in South River 08882

The dot is this home. The mark in the middle is the typical home in South River 08882.

Estimated value$402,052
CheaperTypical $524,162Pricier

Pricier than 8% of homes nearby

Price per ft²$421
CheaperTypical $339Pricier

Pricier than 88% of homes nearby

Living area956 ft²
SmallerTypical 1,552 ft²Bigger

Bigger than 5% of homes nearby

Lot size3,202 ft²
SmallerTypical 0.14 acBigger

Bigger than 7% of homes nearby

Year built1951
OlderTypical 1950Newer

Newer than 54% of homes nearby

How 51 William St ranks against every home in each area.
MeasureThis homeSouth River 08882Middlesex County
Estimated valuepricier than$402,0528% of homes12% of homes
Price per ft²pricier than$42188% of homes78% of homes
Living areabigger than956 ft²5% of homes8% of homes
Lot sizebigger than3,202 ft²7% of homes26% of homes
Year builtnewer than195154% of homes25% of homes

About 51 William St

How much is 51 William St, South River, NJ worth?

The TopHap Estimate for 51 William St, South River, NJ is $402,052 as of Jul 14, 2026. The likely range is $378,756 to $425,348. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 51 William St, South River, NJ last sell?

51 William St, South River, NJ last sold on Oct 12, 2017 for $127,000, according to the county's recorded deed.

How big is 51 William St, South River, NJ?

51 William St, South River, NJ has 956 square feet of living space and a 0.07-acre lot.

When was 51 William St, South River, NJ built?

51 William St, South River, NJ was built in 1951, making it 75 years old. The building has 1 story.

What schools serve 51 William St, South River, NJ?

51 William St, South River, NJ is assigned to South River Primary School (elementary); South River Middle School (middle), rated C-; South River High School (high), rated D. All sit in South River Borough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 51 William St, South River, NJ compare to other homes in South River 08882?

Among the 4,333 homes in South River 08882, it is worth more than 8% of them ($402,052 against a typical $524,162), its price per square foot is higher than 88% of them ($421 against a typical $339), it is bigger than 5% of them (956 ft² against a typical 1,552 ft²), its lot is bigger than 7% of them (3,202 ft² against a typical 0.14 ac) and it is newer than 54% of them (1951 against a typical 1950). Measured against all of Middlesex County, it is worth more than 12% 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 51 William St, South River, NJ?

The 2025 property tax bill for 51 William St, South River, NJ was $5,597. The county assessed it at $209,700.

Closest homes

More homes in South River 08882

Assigned schools

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