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Single Family ResidenceResidential
$1,216,617$369 / 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 82How 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 $629,500 on Jul 15, 2010

12 MAINSAIL DR

GROTON, CT 06340
4
Beds
3
Baths
3,299 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.
0.48 ac
Lot SizeThe size of the land the home sits on, from county records.
1988
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.

Valuation

$1.2M
$994K low$1.4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$629,500 · Jul 15, 2010

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$15,729 (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.$596,260 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$247,870
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$348,390
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$596,260
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$417,382

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.32
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
16
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
49
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
81
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
16
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
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.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Contemporary
CountySOUTHEASTERN CONNECTICUT
Lot (acres)The size of the land the home sits on, from county records.0.48
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Geo-Thermal
CoolingThe type of cooling or air conditioning in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
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(9)

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.

H
Robert E. Fitch High SchoolC+
High · Grades 9–12 · 1.2 mi
E
Mystic River Magnet SchoolC-
Elementary · Grades PK–5 · 1.5 mi
M
Groton Middle SchoolC
Middle · Grades 6–8 · 1.5 mi

District: Groton School District

Neighborhood · ZIP 06340These 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.104
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.109
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.56

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.91%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.23%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.8%
PopulationHow many people live in this area.27,657
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.992 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$80,998
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$95,942
Average tempThe average temperature here across a full year.51°F
Annual precipHow much rain and melted snow falls here in a typical year.49 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.56%

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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 Mainsail Dr 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 97% of homes in Southeastern Connecticut County
  • Costs more per square foot than 85% of homes in Southeastern Connecticut County
  • Bigger than 97% of homes in Southeastern Connecticut County
  • Has a bigger lot than 79% of homes in Groton 06340
  • Newer than 77% of homes in Groton 06340

What homes are worth in Groton 06340

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

This home
$187K$2.2M

This home is worth more than 91% of homes in Groton 06340.

How it measures up in Groton 06340

The dot is this home. The mark in the middle is the typical home in Groton 06340.

Estimated value$1,216,617
CheaperTypical $385,857Pricier

Pricier than 91% of homes nearby

Price per ft²$369
CheaperTypical $289Pricier

Pricier than 76% of homes nearby

Living area3,299 ft²
SmallerTypical 1,425 ft²Bigger

Bigger than 96% of homes nearby

Lot size0.48 ac
SmallerTypical 0.28 acBigger

Bigger than 79% of homes nearby

Year built1988
OlderTypical 1960Newer

Newer than 77% of homes nearby

How 12 Mainsail Dr ranks against every home in each area.
MeasureThis homeGroton 06340Southeastern Connecticut County
Estimated valuepricier than$1,216,61791% of homes97% of homes
Price per ft²pricier than$36976% of homes85% of homes
Living areabigger than3,299 ft²96% of homes97% of homes
Lot sizebigger than0.48 ac79% of homes47% of homes
Year builtnewer than198877% of homes76% of homes

About 12 Mainsail Dr

How much is 12 Mainsail Dr, Groton, CT worth?

The TopHap Estimate for 12 Mainsail Dr, Groton, CT is $1,216,617 as of Sep 24, 2026. The likely range is $994,315 to $1,438,919. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 12 Mainsail Dr, Groton, CT last sell?

12 Mainsail Dr, Groton, CT last sold on Jul 15, 2010 for $629,500, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 12 Mainsail Dr, Groton, CT?

12 Mainsail Dr, Groton, CT has 4 bedrooms, 3 bathrooms, 3,299 square feet of living space and a 0.48-acre lot.

When was 12 Mainsail Dr, Groton, CT built?

12 Mainsail Dr, Groton, CT was built in 1988, making it 38 years old. It is a contemporary home. The building has 2 stories.

What schools serve 12 Mainsail Dr, Groton, CT?

12 Mainsail Dr, Groton, CT is assigned to Robert E. Fitch High School (high), rated C+; Mystic River Magnet School (elementary), rated C-; Groton Middle School (middle), rated C. All sit in Groton School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 12 Mainsail Dr, Groton, CT compare to other homes in Groton 06340?

Among the 7,236 homes in Groton 06340, it is worth more than 91% of them ($1,216,617 against a typical $385,857), its price per square foot is higher than 76% of them ($369 against a typical $289), it is bigger than 96% of them (3,299 ft² against a typical 1,425 ft²), its lot is bigger than 79% of them (0.48 ac against a typical 0.28 ac) and it is newer than 77% of them (1988 against a typical 1960). Measured against all of Southeastern Connecticut County, it is worth more than 97% 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 Mainsail Dr, Groton, CT?

The 2025 property tax bill for 12 Mainsail Dr, Groton, CT was $15,729. The county assessed it at $596,260.

More homes on Mainsail Dr

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