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Single Family ResidenceResidential
$1,464,455$475 / 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 89How 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 $679,000 on Nov 26, 2002

18 SPRING ST

GROTON, CT 06340
4
Beds
2.5
Baths
3,080 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.
0.13 ac
Lot SizeThe size of the land the home sits on, from county records.
1880
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
9
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$1.5M
$1.3M low$1.6M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$679,000 · Nov 26, 2002

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$15,133 (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.$573,650 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$342,664
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$230,986
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$573,650
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$401,555

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountySOUTHEASTERN CONNECTICUT
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1998
Lot (acres)The size of the land the home sits on, from county records.0.13
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Hot Water
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(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
Mystic River Magnet SchoolC-
Elementary · Grades PK–5 · 1.7 mi
H
Robert E. Fitch High SchoolC+
High · Grades 9–12 · 1.8 mi
M
Groton Middle SchoolC
Middle · Grades 6–8 · 2.0 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

18 Spring 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 98% of homes in Southeastern Connecticut County
  • Costs more per square foot than 95% of homes in Southeastern Connecticut County
  • Bigger than 95% of homes in Groton 06340
  • Has a smaller lot than 93% of homes in Southeastern Connecticut County
  • Older than 96% 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
$192K$2.2M

This home is worth more than 95% 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$1,464,455
CheaperTypical $390,690Pricier

Pricier than 95% of homes nearby

Price per ft²$475
CheaperTypical $290Pricier

Pricier than 85% of homes nearby

Living area3,080 ft²
SmallerTypical 1,420 ft²Bigger

Bigger than 95% of homes nearby

Lot size0.13 ac
SmallerTypical 0.28 acBigger

Bigger than 11% of homes nearby

Year built1880
OlderTypical 1960Newer

Newer than 4% of homes nearby

How 18 Spring St ranks against every home in each area.
MeasureThis homeGroton 06340Southeastern Connecticut County
Estimated valuepricier than$1,464,45595% of homes98% of homes
Price per ft²pricier than$47585% of homes95% of homes
Living areabigger than3,080 ft²95% of homes95% of homes
Lot sizebigger than0.13 ac11% of homes7% of homes
Year builtnewer than18804% of homes5% of homes

About 18 Spring St

How much is 18 Spring St, Groton, CT worth?

The TopHap Estimate for 18 Spring St, Groton, CT is $1,464,455 as of Oct 21, 2026. The likely range is $1,296,158 to $1,632,752. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 18 Spring St, Groton, CT last sell?

18 Spring St, Groton, CT last sold on Nov 26, 2002 for $679,000, according to the county's recorded deed.

How big is 18 Spring St, Groton, CT?

18 Spring St, Groton, CT has 4 bedrooms, 2.5 bathrooms, 3,080 square feet of living space and a 0.13-acre lot.

When was 18 Spring St, Groton, CT built?

18 Spring St, Groton, CT was built in 1880, making it 146 years old. The building has 2 stories.

What schools serve 18 Spring St, Groton, CT?

18 Spring St, Groton, CT is assigned to Mystic River Magnet School (elementary), rated C-; Robert E. Fitch High School (high), 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 18 Spring St, Groton, CT compare to other homes in Groton 06340?

Among the 7,236 homes in Groton 06340, it is worth more than 95% of them ($1,464,455 against a typical $390,690), its price per square foot is higher than 85% of them ($475 against a typical $290), it is bigger than 95% of them (3,080 ft² against a typical 1,420 ft²), its lot is bigger than 11% of them (0.13 ac against a typical 0.28 ac) and it is newer than 4% of them (1880 against a typical 1960). Measured against all of Southeastern Connecticut County, it is worth more than 98% 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 18 Spring St, Groton, CT?

The 2025 property tax bill for 18 Spring St, Groton, CT was $15,133. The county assessed it at $573,650.

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