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Duplex (2 Units, Any Combination)Residential
Last sold for $68,000 on Mar 16, 2009

21 ALTON ST

NEW HAVEN, CT 06513
6
Beds
3
Baths
2,055 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.
3,485 ft²
Lot SizeThe size of the land the home sits on, from county records.
1900
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
11
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$68,000 · Mar 16, 2009

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,036 (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.$127,820 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$26,320
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$101,500
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$127,820
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$89,474

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.36 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.45%
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.Duplex (2 Units, Any Combination)
StyleThe architectural style of the home, such as ranch or colonial.Duplex Single
CountySOUTH CENTRAL CONNECTICUT
Lot (acres)The size of the land the home sits on, from county records.0.08
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
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.

Foreclosure Filings(1)

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Clinton Avenue SchoolD+
Elementary · Grades KG–8 · 0.7 mi
H
Wilbur Cross High SchoolF
High · Grades 9–12 · 0.8 mi

District: New Haven School District

Neighborhood · ZIP 06513These 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.143
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.120
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.62

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.12%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.21%
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.35,531
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,689 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$52,010
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$70,381
Average tempThe average temperature here across a full year.51°F
Annual precipHow much rain and melted snow falls here in a typical year.48 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

21 Alton 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.

  • Bigger than 76% of homes in New Haven 06513
  • Has a smaller lot than 97% of homes in South Central Connecticut County
  • Older than 91% of homes in South Central Connecticut County

How it measures up in New Haven 06513

The dot is this home. The mark in the middle is the typical home in New Haven 06513.

Living area2,055 ft²
SmallerTypical 1,295 ft²Bigger

Bigger than 76% of homes nearby

Lot size3,485 ft²
SmallerTypical 0.17 acBigger

Bigger than 9% of homes nearby

Year built1900
OlderTypical 1960Newer

Newer than 23% of homes nearby

How 21 Alton St ranks against every home in each area.
MeasureThis homeFair HavenNew Haven 06513South Central Connecticut County
Living areabigger than2,055 ft²43% of homes76% of homes73% of homes
Lot sizebigger than3,485 ft²25% of homes9% of homes3% of homes
Year builtnewer than190064% of homes23% of homes9% of homes

About 21 Alton St

When did 21 Alton St, New Haven, CT last sell?

21 Alton St, New Haven, CT last sold on Mar 16, 2009 for $68,000, according to the county's recorded deed. TopHap holds 8 recorded sales for this parcel.

How big is 21 Alton St, New Haven, CT?

21 Alton St, New Haven, CT has 6 bedrooms, 3 bathrooms, 2,055 square feet of living space and a 0.08-acre lot.

When was 21 Alton St, New Haven, CT built?

21 Alton St, New Haven, CT was built in 1900, making it 126 years old. It is a duplex single home. The building has 2 stories.

What schools serve 21 Alton St, New Haven, CT?

21 Alton St, New Haven, CT is assigned to Clinton Avenue School (elementary), rated D+; Wilbur Cross High School (high), rated F. All sit in New Haven School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Alton St, New Haven, CT compare to other homes in New Haven 06513?

Among the 7,601 homes in New Haven 06513, it is bigger than 76% of them (2,055 ft² against a typical 1,295 ft²), its lot is bigger than 9% of them (3,485 ft² against a typical 0.17 ac) and it is newer than 23% of them (1900 against a typical 1960). 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 Alton St, New Haven, CT?

The 2025 property tax bill for 21 Alton St, New Haven, CT was $5,036. The county assessed it at $127,820.

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