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Single Family ResidenceResidential
$815,742$425 / 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 $437,000 on Apr 28, 2005

21 HOLT ST

HOPKINTON, MA 01748
3
Beds
3
Baths
1,920 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.
0.71 ac
Lot SizeThe size of the land the home sits on, from county records.
1950
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

$816K
$787K low$845K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$437,000 · Apr 28, 2005

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,099 (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.$641,700 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$284,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$356,800
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$713,735

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.Colonial
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.71
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
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(12)

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.

M
Hopkinton Middle SchoolA
Middle · Grades 6–8 · 0.5 mi
H
Hopkinton High SchoolA+
High · Grades 9–12 · 0.6 mi
E
Marathon Elementary School
Elementary · Grades PK–1 · 0.7 mi

District: Hopkinton School District

Neighborhood · ZIP 01748These 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.36
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.97
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.66

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.37%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.19,208
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.687 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$189,861
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$255,819
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 Holt 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 69% of homes in Hopkinton 01748
  • Smaller than 66% of homes in Hopkinton 01748
  • Has a smaller lot than 74% of homes in Hopkinton 01748
  • Older than 85% of homes in Hopkinton 01748

What homes are worth in Hopkinton 01748

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

This home
$434K$2.1M

This home is worth more than 31% of homes in Hopkinton 01748.

How it measures up in Hopkinton 01748

The dot is this home. The mark in the middle is the typical home in Hopkinton 01748.

Estimated value$815,742
CheaperTypical $996,273Pricier

Pricier than 31% of homes nearby

Price per ft²$425
CheaperTypical $435Pricier

Pricier than 46% of homes nearby

Living area1,920 ft²
SmallerTypical 2,316 ft²Bigger

Bigger than 34% of homes nearby

Lot size0.71 ac
SmallerTypical 1.24 acBigger

Bigger than 26% of homes nearby

Year built1950
OlderTypical 1992Newer

Newer than 15% of homes nearby

How 21 Holt St ranks against every home in each area.
MeasureThis homeHopkinton 01748Middlesex County
Estimated valuepricier than$815,74231% of homes54% of homes
Price per ft²pricier than$42546% of homes40% of homes
Living areabigger than1,920 ft²34% of homes54% of homes
Lot sizebigger than0.71 ac26% of homes72% of homes
Year builtnewer than195015% of homes42% of homes

About 21 Holt St

How much is 21 Holt St, Hopkinton, MA worth?

The TopHap Estimate for 21 Holt St, Hopkinton, MA is $815,742 as of Aug 30, 2026. The likely range is $786,944 to $844,540. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Holt St, Hopkinton, MA last sell?

21 Holt St, Hopkinton, MA last sold on Apr 28, 2005 for $437,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 21 Holt St, Hopkinton, MA?

21 Holt St, Hopkinton, MA has 3 bedrooms, 3 bathrooms, 1,920 square feet of living space and a 0.71-acre lot.

When was 21 Holt St, Hopkinton, MA built?

21 Holt St, Hopkinton, MA was built in 1950, making it 76 years old. It is a colonial home. The building has 2 stories.

What schools serve 21 Holt St, Hopkinton, MA?

21 Holt St, Hopkinton, MA is assigned to Hopkinton Middle School (middle), rated A; Hopkinton High School (high), rated A+; Marathon Elementary School (elementary). All sit in Hopkinton School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Holt St, Hopkinton, MA compare to other homes in Hopkinton 01748?

Among the 6,096 homes in Hopkinton 01748, it is worth more than 31% of them ($815,742 against a typical $996,273), its price per square foot is higher than 46% of them ($425 against a typical $435), it is bigger than 34% of them (1,920 ft² against a typical 2,316 ft²), its lot is bigger than 26% of them (0.71 ac against a typical 1.24 ac) and it is newer than 15% of them (1950 against a typical 1992). Measured against all of Middlesex County, it is worth more than 54% 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 Holt St, Hopkinton, MA?

The 2025 property tax bill for 21 Holt St, Hopkinton, MA was $9,099. The county assessed it at $641,700.

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