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Single Family ResidenceResidential
$584,732$527 / 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 91How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $345,000 on Aug 28, 2003

20 KEACH ST

WALTHAM, MA 02453
3
Beds
1.5
Baths
1,109 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.
0.12 ac
Lot SizeThe size of the land the home sits on, from county records.
1955
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
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

$585K
$533K low$636K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$345,000 · Aug 28, 2003

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,866 (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.$597,400 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$379,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$218,400
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$669,085

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.Ranch
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.12
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
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.

E
Thomas R Plympton Elementary SchoolC
Elementary · Grades KG–5 · 1.3 mi
M
John F. Kennedy Middle SchoolA-
Middle · Grades 6–8 · 2.2 mi
H
Waltham Sr High SchoolC
High · Grades 9–12 · 2.3 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

20 Keach 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 less than 86% of homes in West Waltham
  • Costs more per square foot than 75% of homes in West Waltham
  • Smaller than 89% of homes in West Waltham
  • Has a smaller lot than 89% of homes in West Waltham
  • Newer than 74% of homes in Waltham 02453

What homes are worth in Waltham 02453

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

This home
$359K$1.3M

This home is worth more than 16% of homes in Waltham 02453.

How it measures up in Waltham 02453

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

Estimated value$584,732
CheaperTypical $787,496Pricier

Pricier than 16% of homes nearby

Price per ft²$527
CheaperTypical $491Pricier

Pricier than 62% of homes nearby

Living area1,109 ft²
SmallerTypical 1,860 ft²Bigger

Bigger than 13% of homes nearby

Lot size0.12 ac
SmallerTypical 0.15 acBigger

Bigger than 25% of homes nearby

Year built1955
OlderTypical 1930Newer

Newer than 74% of homes nearby

How 20 Keach St ranks against every home in each area.
MeasureThis homeWest WalthamWaltham 02453Middlesex County
Estimated valuepricier than$584,73214% of homes16% of homes24% of homes
Price per ft²pricier than$52775% of homes62% of homes64% of homes
Living areabigger than1,109 ft²11% of homes13% of homes16% of homes
Lot sizebigger than0.12 ac11% of homes25% of homes16% of homes
Year builtnewer than195545% of homes74% of homes47% of homes

About 20 Keach St

How much is 20 Keach St, Waltham, MA worth?

The TopHap Estimate for 20 Keach St, Waltham, MA is $584,732 as of Sep 24, 2026. The likely range is $533,120 to $636,344. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Keach St, Waltham, MA last sell?

20 Keach St, Waltham, MA last sold on Aug 28, 2003 for $345,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 20 Keach St, Waltham, MA?

20 Keach St, Waltham, MA has 3 bedrooms, 1.5 bathrooms, 1,109 square feet of living space and a 0.12-acre lot.

When was 20 Keach St, Waltham, MA built?

20 Keach St, Waltham, MA was built in 1955, making it 71 years old. It is a ranch home. The building has 1 story.

What schools serve 20 Keach St, Waltham, MA?

20 Keach St, Waltham, MA is assigned to Thomas R Plympton Elementary School (elementary), rated C; John F. Kennedy Middle School (middle), rated A-; 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 20 Keach St, Waltham, MA compare to other homes in Waltham 02453?

Among the 6,296 homes in Waltham 02453, it is worth more than 16% of them ($584,732 against a typical $787,496), its price per square foot is higher than 62% of them ($527 against a typical $491), it is bigger than 13% of them (1,109 ft² against a typical 1,860 ft²), its lot is bigger than 25% of them (0.12 ac against a typical 0.15 ac) and it is newer than 74% of them (1955 against a typical 1930). Measured against all of Middlesex County, it is worth more than 24% 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 Keach St, Waltham, MA?

The 2025 property tax bill for 20 Keach St, Waltham, MA was $5,866. The county assessed it at $597,400.

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Assigned schools

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