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Single Family ResidenceResidential
$539,704$384 / 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 Oct 21, 2026

21 SUMMIT AVE

MARLBOROUGH, MA 01752
3
Beds
1.5
Baths
1,407 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.
0.24 ac
Lot SizeThe size of the land the home sits on, from county records.
1960
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$540K
$509K low$570K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,795 (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.$486,300 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$220,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$265,400
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$523,545

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.Ranch
CountyMIDDLESEX
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.1978
Lot (acres)The size of the land the home sits on, from county records.0.24
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Hot Water
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(1)

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
Sgt. Charles J. Jaworek Elementary SchoolD+
Elementary · Grades KG–5 · 0.2 mi
H
Marlborough High SchoolD+
High · Grades 9–12 · 0.5 mi
M
1LT Charles W. Whitcomb SchoolD
Middle · Grades 6–8 · 0.8 mi

District: Marlborough School District

Neighborhood · ZIP 01752These 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.100
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.101
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.26%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.1%
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.42,223
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,953 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$88,959
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$112,206
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 Summit 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 81% of homes in Middlesex County
  • Costs less per square foot than 70% of homes in Middlesex County
  • Smaller than 70% of homes in Middlesex County
  • Has a smaller lot than 75% of homes in Marlborough 01752

What homes are worth in Marlborough 01752

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

This home
$210K$1M

This home is worth more than 47% of homes in Marlborough 01752.

How it measures up in Marlborough 01752

The dot is this home. The mark in the middle is the typical home in Marlborough 01752.

Estimated value$539,704
CheaperTypical $554,599Pricier

Pricier than 47% of homes nearby

Price per ft²$384
CheaperTypical $350Pricier

Pricier than 68% of homes nearby

Living area1,407 ft²
SmallerTypical 1,591 ft²Bigger

Bigger than 40% of homes nearby

Lot size0.24 ac
SmallerTypical 0.46 acBigger

Bigger than 25% of homes nearby

Year built1960
OlderTypical 1967Newer

Newer than 38% of homes nearby

How 21 Summit Ave ranks against every home in each area.
MeasureThis homeMarlborough 01752Middlesex County
Estimated valuepricier than$539,70447% of homes19% of homes
Price per ft²pricier than$38468% of homes30% of homes
Living areabigger than1,407 ft²40% of homes30% of homes
Lot sizebigger than0.24 ac25% of homes42% of homes
Year builtnewer than196038% of homes53% of homes

About 21 Summit Ave

How much is 21 Summit Ave, Marlborough, MA worth?

The TopHap Estimate for 21 Summit Ave, Marlborough, MA is $539,704 as of Oct 21, 2026. The likely range is $509,423 to $569,985. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Summit Ave, Marlborough, MA last sell?

21 Summit Ave, Marlborough, MA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 Summit Ave, Marlborough, MA?

21 Summit Ave, Marlborough, MA has 3 bedrooms, 1.5 bathrooms, 1,407 square feet of living space and a 0.24-acre lot.

When was 21 Summit Ave, Marlborough, MA built?

21 Summit Ave, Marlborough, MA was built in 1960, making it 66 years old. It is a ranch home. The building has 1 story.

What schools serve 21 Summit Ave, Marlborough, MA?

21 Summit Ave, Marlborough, MA is assigned to Sgt. Charles J. Jaworek Elementary School (elementary), rated D+; Marlborough High School (high), rated D+; 1LT Charles W. Whitcomb School (middle), rated D. All sit in Marlborough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Summit Ave, Marlborough, MA compare to other homes in Marlborough 01752?

Among the 10,751 homes in Marlborough 01752, it is worth more than 47% of them ($539,704 against a typical $554,599), its price per square foot is higher than 68% of them ($384 against a typical $350), it is bigger than 40% of them (1,407 ft² against a typical 1,591 ft²), its lot is bigger than 25% of them (0.24 ac against a typical 0.46 ac) and it is newer than 38% of them (1960 against a typical 1967). Measured against all of Middlesex County, it is worth more than 19% 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 Summit Ave, Marlborough, MA?

The 2025 property tax bill for 21 Summit Ave, Marlborough, MA was $4,795. The county assessed it at $486,300.

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