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Single Family ResidenceResidential
$896,449$360 / 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 95How 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

21 WHISTLE POST LN

GROTON, MA 01450
4
Beds
2.5
Baths
2,492 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.
1.01 ac
Lot SizeThe size of the land the home sits on, from county records.
1998
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$896K
$848K low$945K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$11,304 (2026)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$764,800 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$284,600
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$480,200
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$734,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$967,955

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.1.01
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
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck

Transaction History(5)

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
Florence Roche Elementary SchoolA-
Elementary · Grades KG–4 · 0.5 mi
M
Groton - Dunstable Regional Middle SchoolA-
Middle · Grades 5–8 · 0.6 mi
H
Groton - Dunstable Regional High SchoolA
High · Grades 9–12 · 3.4 mi

District: Groton-Dunstable School District

Neighborhood · ZIP 01450These 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.73
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 100.77

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.4.8%
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.11,438
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.343 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$170,664
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$181,425
Average tempThe average temperature here across a full year.47°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%

Owner Tools

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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 Whistle Post Ln 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 70% of homes in Groton 01450
  • Costs less per square foot than 78% of homes in Middlesex County
  • Bigger than 74% of homes in Middlesex County
  • Has a bigger lot than 80% of homes in Middlesex County
  • Newer than 87% of homes in Middlesex County

What homes are worth in Groton 01450

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

This home
$314K$1.4M

This home is worth more than 70% of homes in Groton 01450.

How it measures up in Groton 01450

The dot is this home. The mark in the middle is the typical home in Groton 01450.

Estimated value$896,449
CheaperTypical $757,682Pricier

Pricier than 70% of homes nearby

Price per ft²$360
CheaperTypical $336Pricier

Pricier than 67% of homes nearby

Living area2,492 ft²
SmallerTypical 2,280 ft²Bigger

Bigger than 59% of homes nearby

Lot size1.01 ac
SmallerTypical 1.29 acBigger

Bigger than 37% of homes nearby

Year built1998
OlderTypical 1985Newer

Newer than 77% of homes nearby

How 21 Whistle Post Ln ranks against every home in each area.
MeasureThis homeGroton 01450Middlesex County
Estimated valuepricier than$896,44970% of homes62% of homes
Price per ft²pricier than$36067% of homes22% of homes
Living areabigger than2,492 ft²59% of homes74% of homes
Lot sizebigger than1.01 ac37% of homes80% of homes
Year builtnewer than199877% of homes87% of homes

About 21 Whistle Post Ln

How much is 21 Whistle Post Ln, Groton, MA worth?

The TopHap Estimate for 21 Whistle Post Ln, Groton, MA is $896,449 as of Sep 24, 2026. The likely range is $847,869 to $945,029. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Whistle Post Ln, Groton, MA last sell?

21 Whistle Post Ln, Groton, MA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 Whistle Post Ln, Groton, MA?

21 Whistle Post Ln, Groton, MA has 4 bedrooms, 2.5 bathrooms, 2,492 square feet of living space and a 1.01-acre lot.

When was 21 Whistle Post Ln, Groton, MA built?

21 Whistle Post Ln, Groton, MA was built in 1998, making it 28 years old. It is a colonial home. The building has 2 stories.

What schools serve 21 Whistle Post Ln, Groton, MA?

21 Whistle Post Ln, Groton, MA is assigned to Florence Roche Elementary School (elementary), rated A-; Groton - Dunstable Regional Middle School (middle), rated A-; Groton - Dunstable Regional High School (high), rated A. All sit in Groton-Dunstable School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Whistle Post Ln, Groton, MA compare to other homes in Groton 01450?

Among the 3,834 homes in Groton 01450, it is worth more than 70% of them ($896,449 against a typical $757,682), its price per square foot is higher than 67% of them ($360 against a typical $336), it is bigger than 59% of them (2,492 ft² against a typical 2,280 ft²), its lot is bigger than 37% of them (1.01 ac against a typical 1.29 ac) and it is newer than 77% of them (1998 against a typical 1985). Measured against all of Middlesex County, it is worth more than 62% 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 Whistle Post Ln, Groton, MA?

The 2026 property tax bill for 21 Whistle Post Ln, Groton, MA was $11,304. The county assessed it at $764,800.

More homes on Whistle Post Ln

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