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Duplex (2 Units, Any Combination)Residential
Last sold for $520,000 on Sep 6, 2016

21 ASH ST

WALTHAM, MA 02453
4
Beds
2.5
Baths
2,654 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.
3,751 ft²
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.
8
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.$520,000 · Sep 6, 2016

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,164 (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.$831,400 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$340,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$490,500

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
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.Hot Water
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(12)

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
Henry Whittemore Elementary SchoolB
Elementary · Grades KG–5 · 0.7 mi
M
John W. McDevitt Middle SchoolB
Middle · Grades 6–8 · 1.0 mi
H
Waltham Sr High SchoolC
High · Grades 9–12 · 2.1 mi

District: Waltham School District

Neighborhood · ZIP 02453These 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.106
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.104
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.73

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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.31%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.8%
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.32,080
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.8,464 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$106,981
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$136,606
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 Ash 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 78% of homes in Middlesex County
  • Has a smaller lot than 94% of homes in Waltham 02453
  • Older than 85% of homes in Middlesex County

How it measures up in Waltham 02453

The dot is this home. The mark in the middle is the typical home in Waltham 02453.

Living area2,654 ft²
SmallerTypical 1,866 ft²Bigger

Bigger than 77% of homes nearby

Lot size3,751 ft²
SmallerTypical 0.15 acBigger

Bigger than 6% of homes nearby

Year built1900
OlderTypical 1930Newer

Newer than 25% of homes nearby

How 21 Ash St ranks against every home in each area.
MeasureThis homeSouthsideWaltham 02453Middlesex County
Living areabigger than2,654 ft²68% of homes77% of homes78% of homes
Lot sizebigger than3,751 ft²10% of homes6% of homes8% of homes
Year builtnewer than190045% of homes25% of homes15% of homes

About 21 Ash St

When did 21 Ash St, Waltham, MA last sell?

21 Ash St, Waltham, MA last sold on Sep 6, 2016 for $520,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 21 Ash St, Waltham, MA?

21 Ash St, Waltham, MA has 4 bedrooms, 2.5 bathrooms, 2,654 square feet of living space and a 0.09-acre lot.

When was 21 Ash St, Waltham, MA built?

21 Ash St, Waltham, 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 Ash St, Waltham, MA?

21 Ash St, Waltham, MA is assigned to Henry Whittemore Elementary School (elementary), rated B; John W. McDevitt Middle School (middle), rated B; Waltham Sr High School (high), rated C. All sit in Waltham School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Ash St, Waltham, MA compare to other homes in Waltham 02453?

Among the 6,296 homes in Waltham 02453, it is bigger than 77% of them (2,654 ft² against a typical 1,866 ft²), its lot is bigger than 6% of them (3,751 ft² against a typical 0.15 ac) and it is newer than 25% of them (1900 against a typical 1930). 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 Ash St, Waltham, MA?

The 2025 property tax bill for 21 Ash St, Waltham, MA was $8,164. The county assessed it at $831,400.

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