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Single Family ResidenceResidential
$474,014$389 / 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 96How 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 $459,999 on Aug 30, 2022

21 TREMONT ST

CHELSEA, MA 02150
2
Beds
1
Baths
1,220 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.
1,364 ft²
Lot SizeThe size of the land the home sits on, from county records.
1860
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$474K
$455K low$493K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$459,999 · Aug 30, 2022

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,864 (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.$510,800 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$224,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$285,900
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$496,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$541,215

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.Conventional
CountySUFFOLK
Lot (acres)The size of the land the home sits on, from county records.0.03
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(10)

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
Eugene Wright Science and Technology AcademyD-
Middle · Grades 5–8 · 0.5 mi
H
Chelsea High SchoolD-
High · Grades 9–12 · 0.8 mi
E
William a Berkowitz Elementary SchoolC+
Elementary · Grades 1–4 · 1.4 mi

District: Chelsea School District

Neighborhood · ZIP 02150These 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.89
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.105
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.76

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.17%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.16%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.40,106
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.16,087 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$72,192
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$94,537
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.45 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 Tremont 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 less than 85% of homes in Suffolk County
  • Costs less per square foot than 88% of homes in Suffolk County
  • Smaller than 67% of homes in Chelsea 02150
  • Has a smaller lot than 94% of homes in Chelsea 02150
  • Older than 98% of homes in Suffolk County

What homes are worth in Chelsea 02150

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

This home
$277K$830K

This home is worth more than 46% of homes in Chelsea 02150.

How it measures up in Chelsea 02150

The dot is this home. The mark in the middle is the typical home in Chelsea 02150.

Estimated value$474,014
CheaperTypical $489,086Pricier

Pricier than 46% of homes nearby

Price per ft²$389
CheaperTypical $437Pricier

Pricier than 29% of homes nearby

Living area1,220 ft²
SmallerTypical 1,739 ft²Bigger

Bigger than 33% of homes nearby

Lot size1,364 ft²
SmallerTypical 3,659 ft²Bigger

Bigger than 6% of homes nearby

Year built1860
OlderTypical 1920Newer

Newer than 3% of homes nearby

How 21 Tremont St ranks against every home in each area.
MeasureThis homeChelsea 02150Suffolk County
Estimated valuepricier than$474,01446% of homes15% of homes
Price per ft²pricier than$38929% of homes12% of homes
Living areabigger than1,220 ft²33% of homes39% of homes
Lot sizebigger than1,364 ft²6% of homes36% of homes
Year builtnewer than18603% of homes2% of homes

About 21 Tremont St

How much is 21 Tremont St, Chelsea, MA worth?

The TopHap Estimate for 21 Tremont St, Chelsea, MA is $474,014 as of Sep 24, 2026. The likely range is $455,280 to $492,748. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Tremont St, Chelsea, MA last sell?

21 Tremont St, Chelsea, MA last sold on Aug 30, 2022 for $459,999, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 21 Tremont St, Chelsea, MA?

21 Tremont St, Chelsea, MA has 2 bedrooms, 1 bathrooms, 1,220 square feet of living space and a 0.03-acre lot.

When was 21 Tremont St, Chelsea, MA built?

21 Tremont St, Chelsea, MA was built in 1860, making it 166 years old. It is a conventional home. The building has 2 stories.

What schools serve 21 Tremont St, Chelsea, MA?

21 Tremont St, Chelsea, MA is assigned to Eugene Wright Science and Technology Academy (middle), rated D-; Chelsea High School (high), rated D-; William a Berkowitz Elementary School (elementary), rated C+. All sit in Chelsea School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Tremont St, Chelsea, MA compare to other homes in Chelsea 02150?

Among the 5,340 homes in Chelsea 02150, it is worth more than 46% of them ($474,014 against a typical $489,086), its price per square foot is higher than 29% of them ($389 against a typical $437), it is bigger than 33% of them (1,220 ft² against a typical 1,739 ft²), its lot is bigger than 6% of them (1,364 ft² against a typical 3,659 ft²) and it is newer than 3% of them (1860 against a typical 1920). Measured against all of Suffolk County, it is worth more than 15% 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 21 Tremont St, Chelsea, MA?

The 2026 property tax bill for 21 Tremont St, Chelsea, MA was $5,864. The county assessed it at $510,800.

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