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Single Family ResidenceResidential
$1,997,770$643 / 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 87How 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 $827,000 on Nov 15, 2007

18 MARSHALL ST

OLD GREENWICH, CT 06870
4
Beds
3.5
Baths
3,106 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.
0.2 ac
Lot SizeThe size of the land the home sits on, from county records.
2017
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.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$2M
$1.7M low$2.3M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$827,000 · Nov 15, 2007

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$14,509 (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.$1,383,900 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$587,510
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$796,390
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,016,190
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$2,606,531

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.42
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
9
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
64
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
96
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
43
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.Colonial
CountyWESTERN CONNECTICUT
Lot (acres)The size of the land the home sits on, from county records.0.20
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
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

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.

E
North Mianus SchoolA+
Elementary · Grades KG–5 · 0.6 mi
M
Eastern Middle SchoolA+
Middle · Grades 6–8 · 1.5 mi
H
Greenwich High SchoolA+
High · Grades 9–12 · 2.4 mi

District: Greenwich School District

Neighborhood · ZIP 06870These 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.80
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.114
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.99

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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.39%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.2.9%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.9%
PopulationHow many people live in this area.8,255
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,558 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$208,823
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$306,114
Average tempThe average temperature here across a full year.52°F
Annual precipHow much rain and melted snow falls here in a typical year.50 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

18 Marshall 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 84% of homes in Western Connecticut County
  • Costs less per square foot than 94% of homes in Old Greenwich 06870
  • Bigger than 78% of homes in Western Connecticut County
  • Has a smaller lot than 82% of homes in Western Connecticut County
  • Newer than 98% of homes in Western Connecticut County

What homes are worth in Old Greenwich 06870

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

This home
$457K$8.6M

This home is worth more than 40% of homes in Old Greenwich 06870.

How it measures up in Old Greenwich 06870

The dot is this home. The mark in the middle is the typical home in Old Greenwich 06870.

Estimated value$1,997,770
CheaperTypical $2,348,514Pricier

Pricier than 40% of homes nearby

Price per ft²$643
CheaperTypical $950Pricier

Pricier than 6% of homes nearby

Living area3,106 ft²
SmallerTypical 2,524 ft²Bigger

Bigger than 66% of homes nearby

Lot size0.2 ac
SmallerTypical 0.27 acBigger

Bigger than 30% of homes nearby

Year built2017
OlderTypical 1957Newer

Newer than 97% of homes nearby

How 18 Marshall St ranks against every home in each area.
MeasureThis homeOld Greenwich 06870Western Connecticut County
Estimated valuepricier than$1,997,77040% of homes84% of homes
Price per ft²pricier than$6436% of homes79% of homes
Living areabigger than3,106 ft²66% of homes78% of homes
Lot sizebigger than0.2 ac30% of homes18% of homes
Year builtnewer than201797% of homes98% of homes

About 18 Marshall St

How much is 18 Marshall St, Old Greenwich, CT worth?

The TopHap Estimate for 18 Marshall St, Old Greenwich, CT is $1,997,770 as of Oct 21, 2026. The likely range is $1,741,421 to $2,254,119. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 18 Marshall St, Old Greenwich, CT last sell?

18 Marshall St, Old Greenwich, CT last sold on Nov 15, 2007 for $827,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 18 Marshall St, Old Greenwich, CT?

18 Marshall St, Old Greenwich, CT has 4 bedrooms, 3.5 bathrooms, 3,106 square feet of living space and a 0.20-acre lot.

When was 18 Marshall St, Old Greenwich, CT built?

18 Marshall St, Old Greenwich, CT was built in 2017, making it 9 years old. It is a colonial home. The building has 2 stories.

What schools serve 18 Marshall St, Old Greenwich, CT?

18 Marshall St, Old Greenwich, CT is assigned to North Mianus School (elementary), rated A+; Eastern Middle School (middle), rated A+; Greenwich High School (high), rated A+. All sit in Greenwich School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 18 Marshall St, Old Greenwich, CT compare to other homes in Old Greenwich 06870?

Among the 2,671 homes in Old Greenwich 06870, it is worth more than 40% of them ($1,997,770 against a typical $2,348,514), its price per square foot is higher than 6% of them ($643 against a typical $950), it is bigger than 66% of them (3,106 ft² against a typical 2,524 ft²), its lot is bigger than 30% of them (0.2 ac against a typical 0.27 ac) and it is newer than 97% of them (2017 against a typical 1957). Measured against all of Western Connecticut County, it is worth more than 84% 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 Marshall St, Old Greenwich, CT?

The 2026 property tax bill for 18 Marshall St, Old Greenwich, CT was $14,509. The county assessed it at $1,383,900.

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