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Duplex (2 Units, Any Combination)Residential
Last sold for $966,000 on Aug 13, 2026

21 JOHN ST

CHELSEA, MA 02150
7
Beds
3
Baths
3,103 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.
0.11 ac
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.
14
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.$966,000 · Aug 13, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,143 (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.$796,400 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$244,800
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$551,600
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$780,700

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
CountySUFFOLK
Lot (acres)The size of the land the home sits on, from county records.0.11
RoofThe main material covering the roof, such as asphalt shingle or tile.Roll Tar & Gravel
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
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.

Foreclosure Filings(1)

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

M
Clark Avenue SchoolD
Middle · Grades 5–8 · 0.3 mi
E
William a Berkowitz Elementary SchoolB
Elementary · Grades 1–4 · 0.4 mi
H
Chelsea High SchoolD-
High · Grades 9–12 · 0.7 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 John 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 86% of homes in Suffolk County
  • Has a bigger lot than 73% of homes in Suffolk County
  • Older than 69% of homes in Suffolk County

How it measures up in Chelsea 02150

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

Living area3,103 ft²
SmallerTypical 1,737 ft²Bigger

Bigger than 82% of homes nearby

Lot size0.11 ac
SmallerTypical 3,659 ft²Bigger

Bigger than 68% of homes nearby

Year built1900
OlderTypical 1920Newer

Newer than 39% of homes nearby

How 21 John St ranks against every home in each area.
MeasureThis homeChelsea 02150Suffolk County
Living areabigger than3,103 ft²82% of homes86% of homes
Lot sizebigger than0.11 ac68% of homes73% of homes
Year builtnewer than190039% of homes31% of homes

About 21 John St

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

21 John St, Chelsea, MA last sold on Aug 13, 2026 for $966,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 21 John St, Chelsea, MA?

21 John St, Chelsea, MA has 7 bedrooms, 3 bathrooms, 3,103 square feet of living space and a 0.11-acre lot.

When was 21 John St, Chelsea, MA built?

21 John St, Chelsea, MA was built in 1900, making it 126 years old. It is a duplex single home. The building has 2 stories.

What schools serve 21 John St, Chelsea, MA?

21 John St, Chelsea, MA is assigned to Clark Avenue School (middle), rated D; William a Berkowitz Elementary School (elementary), rated B; Chelsea High School (high), rated D-. All sit in Chelsea School District. Attendance boundaries change — confirm with the district before relying on an assignment.

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

Among the 5,340 homes in Chelsea 02150, it is bigger than 82% of them (3,103 ft² against a typical 1,737 ft²), its lot is bigger than 68% of them (0.11 ac against a typical 3,659 ft²) and it is newer than 39% of them (1900 against a typical 1920). 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 John St, Chelsea, MA?

The 2026 property tax bill for 21 John St, Chelsea, MA was $9,143. The county assessed it at $796,400.

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Assigned schools

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