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Single Family ResidenceResidential
$1,172,083
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 95How 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
Last sold for $1,025,000 on May 27, 2021

40 BROOK ST

ACTON, MA 01720
0
Baths
3.98 ac
Lot SizeThe size of the land the home sits on, from county records.

Valuation

$1.2M
$1.1M low$1.2M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,025,000 · May 27, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$19,849 (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.$1,157,400 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$359,200
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$798,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,237,945

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.87 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%
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.1 percent flood zone

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.3.98
CoolingThe type of cooling or air conditioning in the home.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(8)

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
Luther Conant Elementary SchoolA+
Elementary · Grades KG–6 · 1.6 mi
H
Acton - Boxborough Regional High SchoolA+
High · Grades 9–12 · 2.2 mi
M
R. J. Grey Junior High SchoolA+
Middle · Grades 7–8 · 2.3 mi

District: Acton-Boxborough School District

Neighborhood · ZIP 01720These 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.71
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.104
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.72

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.33%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.2.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.24,473
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,210 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$148,952
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$187,397
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.47 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

40 Brook 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 more than 83% of homes in Acton 01720
  • Has a bigger lot than 92% of homes in Middlesex County

What homes are worth in Acton 01720

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

This home
$225K$1.7M

This home is worth more than 83% of homes in Acton 01720.

How it measures up in Acton 01720

The dot is this home. The mark in the middle is the typical home in Acton 01720.

Estimated value$1,172,083
CheaperTypical $843,855Pricier

Pricier than 83% of homes nearby

Lot size3.98 ac
SmallerTypical 0.73 acBigger

Bigger than 81% of homes nearby

How 40 Brook St ranks against every home in each area.
MeasureThis homeActon 01720Middlesex County
Estimated valuepricier than$1,172,08383% of homes80% of homes
Lot sizebigger than3.98 ac81% of homes92% of homes

About 40 Brook St

How much is 40 Brook St, Acton, MA worth?

The TopHap Estimate for 40 Brook St, Acton, MA is $1,172,083 as of Oct 21, 2026. The likely range is $1,111,693 to $1,232,473. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 40 Brook St, Acton, MA last sell?

40 Brook St, Acton, MA last sold on May 27, 2021 for $1,025,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

What schools serve 40 Brook St, Acton, MA?

40 Brook St, Acton, MA is assigned to Luther Conant Elementary School (elementary), rated A+; Acton - Boxborough Regional High School (high), rated A+; R. J. Grey Junior High School (middle), rated A+. All sit in Acton-Boxborough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 40 Brook St, Acton, MA compare to other homes in Acton 01720?

Among the 7,508 homes in Acton 01720, it is worth more than 83% of them ($1,172,083 against a typical $843,855) and its lot is bigger than 81% of them (3.98 ac against a typical 0.73 ac). Measured against all of Middlesex County, it is worth more than 80% 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 40 Brook St, Acton, MA?

The 2025 property tax bill for 40 Brook St, Acton, MA was $19,849. The county assessed it at $1,157,400.

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Assigned schools

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