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Single Family ResidenceResidential
$809,641$593 / 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 92How 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 $70,000 on May 13, 2005

12 FLAGG RD

ACTON, MA 01720
3
Beds
3.5
Baths
1,365 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.
1.12 ac
Lot SizeThe size of the land the home sits on, from county records.
1964
Year BuiltThe year the home was originally built, according to county records.
1
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

$810K
$748K low$872K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$70,000 · May 13, 2005

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$12,471 (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.$727,200 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$364,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$362,300
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$769,595

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.Contemporary
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.1.12
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Hot Water
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(2)

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 · 1.4 mi
M
R. J. Grey Junior High SchoolA
Middle · Grades 7–8 · 2.5 mi
H
Acton - Boxborough Regional High SchoolA
High · Grades 9–12 · 2.5 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

12 Flagg Rd 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.

  • Costs more per square foot than 95% of homes in Acton 01720
  • Smaller than 75% of homes in Acton 01720
  • Has a bigger lot than 82% of homes in Middlesex County
  • Older than 69% of homes in Acton 01720

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
$228K$1.7M

This home is worth more than 44% 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$809,641
CheaperTypical $858,998Pricier

Pricier than 44% of homes nearby

Price per ft²$593
CheaperTypical $409Pricier

Pricier than 95% of homes nearby

Living area1,365 ft²
SmallerTypical 2,082 ft²Bigger

Bigger than 25% of homes nearby

Lot size1.12 ac
SmallerTypical 0.72 acBigger

Bigger than 65% of homes nearby

Year built1964
OlderTypical 1971Newer

Newer than 31% of homes nearby

How 12 Flagg Rd ranks against every home in each area.
MeasureThis homeActon 01720Middlesex County
Estimated valuepricier than$809,64144% of homes53% of homes
Price per ft²pricier than$59395% of homes75% of homes
Living areabigger than1,365 ft²25% of homes28% of homes
Lot sizebigger than1.12 ac65% of homes82% of homes
Year builtnewer than196431% of homes58% of homes

About 12 Flagg Rd

How much is 12 Flagg Rd, Acton, MA worth?

The TopHap Estimate for 12 Flagg Rd, Acton, MA is $809,641 as of Aug 30, 2026. The likely range is $747,593 to $871,689. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 12 Flagg Rd, Acton, MA last sell?

12 Flagg Rd, Acton, MA last sold on May 13, 2005 for $70,000, according to the county's recorded deed.

How big is 12 Flagg Rd, Acton, MA?

12 Flagg Rd, Acton, MA has 3 bedrooms, 3.5 bathrooms, 1,365 square feet of living space and a 1.12-acre lot.

When was 12 Flagg Rd, Acton, MA built?

12 Flagg Rd, Acton, MA was built in 1964, making it 62 years old. It is a contemporary home. The building has 1 story.

What schools serve 12 Flagg Rd, Acton, MA?

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

How does 12 Flagg Rd, Acton, MA compare to other homes in Acton 01720?

Among the 7,508 homes in Acton 01720, it is worth more than 44% of them ($809,641 against a typical $858,998), its price per square foot is higher than 95% of them ($593 against a typical $409), it is bigger than 25% of them (1,365 ft² against a typical 2,082 ft²), its lot is bigger than 65% of them (1.12 ac against a typical 0.72 ac) and it is newer than 31% of them (1964 against a typical 1971). Measured against all of Middlesex County, it is worth more than 53% 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 12 Flagg Rd, Acton, MA?

The 2025 property tax bill for 12 Flagg Rd, Acton, MA was $12,471. The county assessed it at $727,200.

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