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Single Family ResidenceResidential
$1,870,840$745 / 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 89How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026

21 SPRING VALLEY ST

ARLINGTON, MA 02476
3
Beds
2.5
Baths
2,511 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.
0.29 ac
Lot SizeThe size of the land the home sits on, from county records.
1922
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.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.9M
$1.7M low$2.1M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$15,108 (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.$1,415,900 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$925,700
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$485,200
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,375,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,654,590

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyMIDDLESEX
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1959
Lot (acres)The size of the land the home sits on, from county records.0.29
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
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(6)

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
Arlington High SchoolA+
High · Grades 9–12 · 0.6 mi
E
Thompson Elementary SchoolA
Elementary · Grades KG–5 · 0.9 mi
M
Ottoson Middle SchoolA+
Middle · Grades 7–8 · 1.2 mi

District: Arlington School District

Neighborhood · ZIP 02476These 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.61
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.109
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.78

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.29%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.8%
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.18,178
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.8,391 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$145,237
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$192,900
Average tempThe average temperature here across a full year.49°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 Spring Valley 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 more than 94% of homes in Arlington 02476
  • Costs more per square foot than 90% of homes in Arlington 02476
  • Bigger than 77% of homes in Arlington 02476
  • Has a bigger lot than 80% of homes in Arlington 02476
  • Older than 75% of homes in Arlington 02476

What homes are worth in Arlington 02476

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

This home
$311K$2.2M

This home is worth more than 94% of homes in Arlington 02476.

How it measures up in Arlington 02476

The dot is this home. The mark in the middle is the typical home in Arlington 02476.

Estimated value$1,870,840
CheaperTypical $1,053,908Pricier

Pricier than 94% of homes nearby

Price per ft²$745
CheaperTypical $599Pricier

Pricier than 90% of homes nearby

Living area2,511 ft²
SmallerTypical 1,843 ft²Bigger

Bigger than 77% of homes nearby

Lot size0.29 ac
SmallerTypical 0.15 acBigger

Bigger than 80% of homes nearby

Year built1922
OlderTypical 1932Newer

Newer than 25% of homes nearby

How 21 Spring Valley St ranks against every home in each area.
MeasureThis homeArlington 02476Middlesex County
Estimated valuepricier than$1,870,84094% of homes94% of homes
Price per ft²pricier than$74590% of homes89% of homes
Living areabigger than2,511 ft²77% of homes74% of homes
Lot sizebigger than0.29 ac80% of homes48% of homes
Year builtnewer than192225% of homes26% of homes

About 21 Spring Valley St

How much is 21 Spring Valley St, Arlington, MA worth?

The TopHap Estimate for 21 Spring Valley St, Arlington, MA is $1,870,840 as of Oct 21, 2026. The likely range is $1,659,659 to $2,082,021. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Spring Valley St, Arlington, MA last sell?

21 Spring Valley St, Arlington, MA last sold on Sep 1, 2015, according to the county's recorded deed.

How big is 21 Spring Valley St, Arlington, MA?

21 Spring Valley St, Arlington, MA has 3 bedrooms, 2.5 bathrooms, 2,511 square feet of living space and a 0.29-acre lot.

When was 21 Spring Valley St, Arlington, MA built?

21 Spring Valley St, Arlington, MA was built in 1922, making it 104 years old. The building has 2 stories.

What schools serve 21 Spring Valley St, Arlington, MA?

21 Spring Valley St, Arlington, MA is assigned to Arlington High School (high), rated A+; Thompson Elementary School (elementary), rated A; Ottoson Middle School (middle), rated A+. All sit in Arlington School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Spring Valley St, Arlington, MA compare to other homes in Arlington 02476?

Among the 5,972 homes in Arlington 02476, it is worth more than 94% of them ($1,870,840 against a typical $1,053,908), its price per square foot is higher than 90% of them ($745 against a typical $599), it is bigger than 77% of them (2,511 ft² against a typical 1,843 ft²), its lot is bigger than 80% of them (0.29 ac against a typical 0.15 ac) and it is newer than 25% of them (1922 against a typical 1932). Measured against all of Middlesex County, it is worth more than 94% 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 Spring Valley St, Arlington, MA?

The 2026 property tax bill for 21 Spring Valley St, Arlington, MA was $15,108. The county assessed it at $1,415,900.

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