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Single Family ResidenceResidential
$878,726$650 / 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 Aug 30, 2026
Last sold for $400,500 on Oct 30, 2009

21 GILBERT ST

WATERTOWN, MA 02472
3
Beds
1.5
Baths
1,352 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.
4,000 ft²
Lot SizeThe size of the land the home sits on, from county records.
1920
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

$879K
$841K low$917K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$400,500 · Oct 30, 2009

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,943 (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.$765,700 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$509,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$256,300
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$740,620

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
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.09
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.Steam
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.

E
Cunniff Elementary SchoolA
Elementary · Grades KG–5 · 0.3 mi
M
Watertown Middle SchoolB-
Middle · Grades 6–8 · 0.3 mi
H
Watertown High SchoolB-
High · Grades 9–12 · 1.0 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%

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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 Gilbert 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 82% of homes in Middlesex County
  • Smaller than 72% of homes in Middlesex County
  • Has a smaller lot than 94% of homes in Watertown West End
  • Older than 74% of homes in Watertown West End

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
$377K$1.8M

This home is worth more than 59% 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$878,726
CheaperTypical $816,900Pricier

Pricier than 59% of homes nearby

Price per ft²$650
CheaperTypical $587Pricier

Pricier than 76% of homes nearby

Living area1,352 ft²
SmallerTypical 1,728 ft²Bigger

Bigger than 34% of homes nearby

Lot size4,000 ft²
SmallerTypical 0.14 acBigger

Bigger than 6% of homes nearby

Year built1920
OlderTypical 1930Newer

Newer than 37% of homes nearby

How 21 Gilbert St ranks against every home in each area.
MeasureThis homeWatertown West EndWatertown 02472Middlesex County
Estimated valuepricier than$878,72658% of homes59% of homes60% of homes
Price per ft²pricier than$65073% of homes76% of homes82% of homes
Living areabigger than1,352 ft²37% of homes34% of homes28% of homes
Lot sizebigger than4,000 ft²6% of homes6% of homes9% of homes
Year builtnewer than192026% of homes37% of homes26% of homes

About 21 Gilbert St

How much is 21 Gilbert St, Watertown, MA worth?

The TopHap Estimate for 21 Gilbert St, Watertown, MA is $878,726 as of Aug 30, 2026. The likely range is $840,600 to $916,852. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Gilbert St, Watertown, MA last sell?

21 Gilbert St, Watertown, MA last sold on Oct 30, 2009 for $400,500, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 21 Gilbert St, Watertown, MA?

21 Gilbert St, Watertown, MA has 3 bedrooms, 1.5 bathrooms, 1,352 square feet of living space and a 0.09-acre lot.

When was 21 Gilbert St, Watertown, MA built?

21 Gilbert St, Watertown, MA was built in 1920, making it 106 years old. It is a conventional home. The building has 2 stories.

What schools serve 21 Gilbert St, Watertown, MA?

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

How does 21 Gilbert St, Watertown, MA compare to other homes in Watertown 02472?

Among the 10,041 homes in Watertown 02472, it is worth more than 59% of them ($878,726 against a typical $816,900), its price per square foot is higher than 76% of them ($650 against a typical $587), it is bigger than 34% of them (1,352 ft² against a typical 1,728 ft²), its lot is bigger than 6% of them (4,000 ft² against a typical 0.14 ac) and it is newer than 37% of them (1920 against a typical 1930). Measured against all of Middlesex County, it is worth more than 60% 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 Gilbert St, Watertown, MA?

The 2025 property tax bill for 21 Gilbert St, Watertown, MA was $8,943. The county assessed it at $765,700.

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