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Single Family ResidenceResidential
$742,250$456 / 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 93How 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 $630,000 on Jul 12, 2022

18 UNION ST

STAMFORD, CT 06906
4
Beds
2.5
Baths
1,626 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.
1935
Year BuiltThe year the home was originally built, according to county records.
2
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

$742K
$694K low$791K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$630,000 · Jul 12, 2022

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,397 (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.$354,920 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$201,840
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$153,080
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$354,920
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$248,444

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.13 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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.Cape Cod
CountyWESTERN 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.1945
Lot (acres)The size of the land the home sits on, from county records.0.20
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Radiant
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(7)

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.

M
Dolan SchoolC-
Middle · Grades 6–8 · 0.4 mi
E
Julia A. Stark SchoolC
Elementary · Grades KG–5 · 0.4 mi
H
Stamford High SchoolD
High · Grades 9–12 · 0.9 mi

District: Stamford School District

Neighborhood · ZIP 06906These 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.84
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.113
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.96

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.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.11%
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.10,703
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.9,439 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$102,130
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$130,161
Average tempThe average temperature here across a full year.52°F
Annual precipHow much rain and melted snow falls here in a typical year.51 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

18 Union 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.

  • Costs more per square foot than 75% of homes in Stamford 06906
  • Has a smaller lot than 83% of homes in Western Connecticut County
  • Older than 85% of homes in Western Connecticut County

What homes are worth in Stamford 06906

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

This home
$294K$1.2M

This home is worth more than 62% of homes in Stamford 06906.

How it measures up in Stamford 06906

The dot is this home. The mark in the middle is the typical home in Stamford 06906.

Estimated value$742,250
CheaperTypical $669,297Pricier

Pricier than 62% of homes nearby

Price per ft²$456
CheaperTypical $400Pricier

Pricier than 75% of homes nearby

Living area1,626 ft²
SmallerTypical 1,712 ft²Bigger

Bigger than 45% of homes nearby

Lot size0.2 ac
SmallerTypical 0.19 acBigger

Bigger than 54% of homes nearby

Year built1935
OlderTypical 1957Newer

Newer than 27% of homes nearby

How 18 Union St ranks against every home in each area.
MeasureThis homeBelltownStamford 06906Western Connecticut County
Estimated valuepricier than$742,25048% of homes62% of homes47% of homes
Price per ft²pricier than$45664% of homes75% of homes59% of homes
Living areabigger than1,626 ft²39% of homes45% of homes38% of homes
Lot sizebigger than0.2 ac42% of homes54% of homes17% of homes
Year builtnewer than193528% of homes27% of homes15% of homes

About 18 Union St

How much is 18 Union St, Stamford, CT worth?

The TopHap Estimate for 18 Union St, Stamford, CT is $742,250 as of Aug 30, 2026. The likely range is $693,736 to $790,764. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 18 Union St, Stamford, CT last sell?

18 Union St, Stamford, CT last sold on Jul 12, 2022 for $630,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 18 Union St, Stamford, CT?

18 Union St, Stamford, CT has 4 bedrooms, 2.5 bathrooms, 1,626 square feet of living space and a 0.20-acre lot.

When was 18 Union St, Stamford, CT built?

18 Union St, Stamford, CT was built in 1935, making it 91 years old. It is a cape cod home. The building has 2 stories.

What schools serve 18 Union St, Stamford, CT?

18 Union St, Stamford, CT is assigned to Dolan School (middle), rated C-; Julia A. Stark School (elementary), rated C; Stamford High School (high), rated D. All sit in Stamford School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 18 Union St, Stamford, CT compare to other homes in Stamford 06906?

Among the 2,834 homes in Stamford 06906, it is worth more than 62% of them ($742,250 against a typical $669,297), its price per square foot is higher than 75% of them ($456 against a typical $400), it is bigger than 45% of them (1,626 ft² against a typical 1,712 ft²), its lot is bigger than 54% of them (0.2 ac against a typical 0.19 ac) and it is newer than 27% of them (1935 against a typical 1957). Measured against all of Western Connecticut County, it is worth more than 47% 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 Union St, Stamford, CT?

The 2025 property tax bill for 18 Union St, Stamford, CT was $8,397. The county assessed it at $354,920.

More homes on Union St

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