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Residential (General/Single)Residential
$9,999,999$162 / 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 65How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $12,800,000 on Jan 3, 2025

421 BOLTON ST

MARLBOROUGH, MA 01752
2
Beds
2
Baths
61,801 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.
5.53 ac
Lot SizeThe size of the land the home sits on, from county records.
2019
Year BuiltThe year the home was originally built, according to county records.
2
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

$10M
$8.7M low$10M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$12,800,000 · Jan 3, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$91,038 (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.$9,233,100 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$253,600
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$8,979,500
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$829,440

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.6 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
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.Residential (General/Single)
StyleThe architectural style of the home, such as ranch or colonial.Cape Cod
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.5.53
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.Forced Air With Air Conditioning
CoolingThe type of cooling or air conditioning in the home.Yes
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(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
Goodnow Brothers Elementary SchoolD+
Elementary · Grades KG–5 · 0.2 mi
M
1LT Charles W. Whitcomb SchoolD
Middle · Grades 6–8 · 0.3 mi
H
Marlborough High SchoolD+
High · Grades 9–12 · 0.3 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

421 Bolton 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.

  • Among the most valuable homes in Marlborough 01752
  • Among the lowest price per square foot in Marlborough 01752
  • Among the largest homes in Marlborough 01752
  • Has a bigger lot than 95% of homes in Middlesex County
  • Among the newest 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
$197K$1M

This home is worth more than almost all 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$9,999,999
CheaperTypical $527,945Pricier

Pricier than almost all homes nearby

Price per ft²$162
CheaperTypical $336Pricier

Cheaper than almost all homes nearby

Living area61,801 ft²
SmallerTypical 1,591 ft²Bigger

Bigger than almost all homes nearby

Lot size5.53 ac
SmallerTypical 0.46 acBigger

Bigger than 91% of homes nearby

Year built2019
OlderTypical 1967Newer

Newer than almost all homes nearby

How 421 Bolton St ranks against every home in each area.
MeasureThis homeMarlborough 01752Middlesex County
Estimated valuepricier than$9,999,999almost all homesalmost all homes
Price per ft²pricier than$162almost no homesalmost no homes
Living areabigger than61,801 ft²almost all homesalmost all homes
Lot sizebigger than5.53 ac91% of homes95% of homes
Year builtnewer than2019almost all homes98% of homes

About 421 Bolton St

How much is 421 Bolton St, Marlborough, MA worth?

The TopHap Estimate for 421 Bolton St, Marlborough, MA is $9,999,999 as of Sep 24, 2026. The likely range is $8,742,650 to $9,999,999. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 421 Bolton St, Marlborough, MA last sell?

421 Bolton St, Marlborough, MA last sold on Jan 3, 2025 for $12,800,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 421 Bolton St, Marlborough, MA?

421 Bolton St, Marlborough, MA has 2 bedrooms, 2 bathrooms, 61,801 square feet of living space and a 5.53-acre lot.

When was 421 Bolton St, Marlborough, MA built?

421 Bolton St, Marlborough, MA was built in 2019, making it 7 years old. It is a cape cod home. The building has 2 stories.

What schools serve 421 Bolton St, Marlborough, MA?

421 Bolton St, Marlborough, MA is assigned to Goodnow Brothers Elementary School (elementary), rated D+; 1LT Charles W. Whitcomb School (middle), rated D; Marlborough High School (high), rated D+. All sit in Marlborough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 421 Bolton St, Marlborough, MA compare to other homes in Marlborough 01752?

Among the 10,751 homes in Marlborough 01752, it is worth more than almost all of them ($9,999,999 against a typical $527,945), its price per square foot is higher than almost none of them ($162 against a typical $336), it is bigger than almost all of them (61,801 ft² against a typical 1,591 ft²), its lot is bigger than 91% of them (5.53 ac against a typical 0.46 ac) and it is newer than almost all of them (2019 against a typical 1967). Measured against all of Middlesex County, it is worth more than almost all 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 421 Bolton St, Marlborough, MA?

The 2025 property tax bill for 421 Bolton St, Marlborough, MA was $91,038. The county assessed it at $9,233,100.

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