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Single Family ResidenceResidential
$520,844$338 / 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 96How 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 $180,000 on May 15, 2013

21 ROCK AVE

HUDSON, MA 01749
3
Beds
1.5
Baths
1,541 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.
0.25 ac
Lot SizeThe size of the land the home sits on, from county records.
1935
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$521K
$498K low$543K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$180,000 · May 15, 2013

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,170 (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.$444,500 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$202,800
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$241,700
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$414,600
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$520,220

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.Conventional
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.25
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.No Foundation
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
PoolWhether the property has a pool, and what kind, such as in-ground.Yes
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(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.

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

E
Forest Avenue Elementary SchoolC+
Elementary · Grades PK–4 · 2.6 mi
M
David J. Quinn Middle SchoolC
Middle · Grades 5–7 · 3.6 mi
H
Hudson High SchoolC
High · Grades 8–12 · 4.6 mi

District: Hudson School District

Neighborhood · ZIP 01749These 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.102
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.103
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.65

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.29%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.20,357
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,766 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$107,752
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$128,047
Average tempThe average temperature here across a full year.48°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.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 Rock Ave 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 83% of homes in Middlesex County
  • Costs less per square foot than 84% of homes in Middlesex County
  • Has a smaller lot than 81% of homes in Hudson 01749
  • Older than 79% of homes in Hudson 01749

What homes are worth in Hudson 01749

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

This home
$266K$1M

This home is worth more than 27% of homes in Hudson 01749.

How it measures up in Hudson 01749

The dot is this home. The mark in the middle is the typical home in Hudson 01749.

Estimated value$520,844
CheaperTypical $594,898Pricier

Pricier than 27% of homes nearby

Price per ft²$338
CheaperTypical $373Pricier

Pricier than 33% of homes nearby

Living area1,541 ft²
SmallerTypical 1,601 ft²Bigger

Bigger than 48% of homes nearby

Lot size0.25 ac
SmallerTypical 0.43 acBigger

Bigger than 19% of homes nearby

Year built1935
OlderTypical 1967Newer

Newer than 21% of homes nearby

How 21 Rock Ave ranks against every home in each area.
MeasureThis homeHudson 01749Middlesex County
Estimated valuepricier than$520,84427% of homes17% of homes
Price per ft²pricier than$33833% of homes16% of homes
Living areabigger than1,541 ft²48% of homes37% of homes
Lot sizebigger than0.25 ac19% of homes44% of homes
Year builtnewer than193521% of homes34% of homes

About 21 Rock Ave

How much is 21 Rock Ave, Hudson, MA worth?

The TopHap Estimate for 21 Rock Ave, Hudson, MA is $520,844 as of Aug 30, 2026. The likely range is $498,497 to $543,191. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Rock Ave, Hudson, MA last sell?

21 Rock Ave, Hudson, MA last sold on May 15, 2013 for $180,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 21 Rock Ave, Hudson, MA?

21 Rock Ave, Hudson, MA has 3 bedrooms, 1.5 bathrooms, 1,541 square feet of living space and a 0.25-acre lot.

When was 21 Rock Ave, Hudson, MA built?

21 Rock Ave, Hudson, MA was built in 1935, making it 91 years old. It is a conventional home. The building has 2 stories.

What schools serve 21 Rock Ave, Hudson, MA?

21 Rock Ave, Hudson, MA is assigned to Forest Avenue Elementary School (elementary), rated C+; David J. Quinn Middle School (middle), rated C; Hudson High School (high), rated C. All sit in Hudson School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Rock Ave, Hudson, MA compare to other homes in Hudson 01749?

Among the 6,463 homes in Hudson 01749, it is worth more than 27% of them ($520,844 against a typical $594,898), its price per square foot is higher than 33% of them ($338 against a typical $373), it is bigger than 48% of them (1,541 ft² against a typical 1,601 ft²), its lot is bigger than 19% of them (0.25 ac against a typical 0.43 ac) and it is newer than 21% of them (1935 against a typical 1967). Measured against all of Middlesex County, it is worth more than 17% 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 Rock Ave, Hudson, MA?

The 2025 property tax bill for 21 Rock Ave, Hudson, MA was $6,170. The county assessed it at $444,500.

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