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CondominiumResidential
$1,621,925$614 / 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 83How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026
Last sold for $940,000 on Aug 26, 2008

20 COMMON ST

WATERTOWN, MA 02472
3
Beds
3 / 2
Baths
2,642 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.
0.47 ac
Lot SizeThe size of the land the home sits on, from county records.
2006
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.

Valuation

$1.6M
$1.4M low$1.9M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$940,000 · Aug 26, 2008
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$771,925
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$617,540
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.53%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$600,000
MORGAN STANLEY DEAN · recorded Sep 11, 2013
2nd MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$250,000
BOSTON PRIVATE BANK & TRUST

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$15,366 (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.$1,315,600 (2025)
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,315,600
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,447,515

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Condominium
CountyMIDDLESEX
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
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(2)

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.

H
Watertown High SchoolB-
High · Grades 9–12 · 0.1 mi
E
Hosmer Elementary SchoolB+
Elementary · Grades PK–5 · 0.6 mi
M
Watertown Middle SchoolB-
Middle · Grades 6–8 · 0.7 mi

District: Watertown School District

Neighborhood · ZIP 02472These 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.112
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.103
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.71

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.34%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.35,928
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.8,689 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$115,227
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$149,103
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.47 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
Company ownedWhether the owner is a company or trust rather than a person.No

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

20 Common 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.

  • Among the most valuable homes in Watertown West End
  • Costs more per square foot than 77% of homes in Middlesex County
  • Bigger than 87% of homes in Watertown West End
  • Has a bigger lot than 84% of homes in Watertown West End
  • Newer than 95% of homes in Watertown 02472

What homes are worth in Watertown 02472

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

This home
$372K$1.8M

This home is worth more than 97% of homes in Watertown 02472.

How it measures up in Watertown 02472

The dot is this home. The mark in the middle is the typical home in Watertown 02472.

Estimated value$1,621,925
CheaperTypical $783,084Pricier

Pricier than 97% of homes nearby

Price per ft²$614
CheaperTypical $569Pricier

Pricier than 69% of homes nearby

Living area2,642 ft²
SmallerTypical 1,731 ft²Bigger

Bigger than 81% of homes nearby

Lot size0.47 ac
SmallerTypical 0.14 acBigger

Bigger than 82% of homes nearby

Year built2006
OlderTypical 1930Newer

Newer than 95% of homes nearby

How 20 Common St ranks against every home in each area.
MeasureThis homeWatertown West EndWatertown 02472Middlesex County
Estimated valuepricier than$1,621,925almost all homes97% of homes90% of homes
Price per ft²pricier than$61467% of homes69% of homes77% of homes
Living areabigger than2,642 ft²87% of homes81% of homes78% of homes
Lot sizebigger than0.47 ac84% of homes82% of homes62% of homes
Year builtnewer than200693% of homes95% of homes93% of homes

About 20 Common St

How much is 20 Common St, Watertown, MA worth?

The TopHap Estimate for 20 Common St, Watertown, MA is $1,621,925 as of Jul 14, 2026. The likely range is $1,353,256 to $1,890,594. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Common St, Watertown, MA last sell?

20 Common St, Watertown, MA last sold on Aug 26, 2008 for $940,000, according to the county's recorded deed.

How big is 20 Common St, Watertown, MA?

20 Common St, Watertown, MA has 3 bedrooms, 3 bathrooms and 2,642 square feet of living space.

When was 20 Common St, Watertown, MA built?

20 Common St, Watertown, MA was built in 2006, making it 20 years old. The building has 2 stories.

What schools serve 20 Common St, Watertown, MA?

20 Common St, Watertown, MA is assigned to Watertown High School (high), rated B-; Hosmer Elementary School (elementary), rated B+; Watertown Middle School (middle), rated B-. All sit in Watertown School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Common St, Watertown, MA compare to other homes in Watertown 02472?

Among the 10,041 homes in Watertown 02472, it is worth more than 97% of them ($1,621,925 against a typical $783,084), its price per square foot is higher than 69% of them ($614 against a typical $569), it is bigger than 81% of them (2,642 ft² against a typical 1,731 ft²), its lot is bigger than 82% of them (0.47 ac against a typical 0.14 ac) and it is newer than 95% of them (2006 against a typical 1930). Measured against all of Middlesex County, it is worth more than 90% 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 20 Common St, Watertown, MA?

The 2025 property tax bill for 20 Common St, Watertown, MA was $15,366. The county assessed it at $1,315,600.

Closest homes

More homes in Watertown 02472

Assigned schools

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