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Single Family ResidenceResidential
$655,373$581 / 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 97How 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 $420,000 on Mar 29, 2017

21 FLOOD ST

WALTHAM, MA 02453
3
Beds
1.5
Baths
1,128 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.
0.11 ac
Lot SizeThe size of the land the home sits on, from county records.
1970
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$655K
$633K low$678K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$420,000 · Mar 29, 2017

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,936 (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.$604,500 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$351,800
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$252,700
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$630,040

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.Colonial
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.11
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
PoolWhether the property has a pool, and what kind, such as in-ground.In-Ground Pool

Transaction History(3)

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 SchoolD+
Elementary · Grades KG–5 · 0.3 mi
M
John W. McDevitt Middle SchoolC
Middle · Grades 6–8 · 0.9 mi
H
Waltham Sr High SchoolD+
High · Grades 9–12 · 1.9 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 Flood 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 77% of homes in Waltham 02453
  • Costs more per square foot than 78% of homes in Waltham 02453
  • Smaller than 86% of homes in Waltham 02453
  • Has a smaller lot than 86% of homes in Middlesex County
  • Newer than 84% of homes in Southside

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
$336K$1.3M

This home is worth more than 23% 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$655,373
CheaperTypical $786,408Pricier

Pricier than 23% of homes nearby

Price per ft²$581
CheaperTypical $493Pricier

Pricier than 78% of homes nearby

Living area1,128 ft²
SmallerTypical 1,867 ft²Bigger

Bigger than 14% of homes nearby

Lot size0.11 ac
SmallerTypical 0.15 acBigger

Bigger than 16% of homes nearby

Year built1970
OlderTypical 1930Newer

Newer than 80% of homes nearby

How 21 Flood St ranks against every home in each area.
MeasureThis homeSouthsideWaltham 02453Middlesex County
Estimated valuepricier than$655,37342% of homes23% of homes33% of homes
Price per ft²pricier than$58176% of homes78% of homes73% of homes
Living areabigger than1,128 ft²18% of homes14% of homes17% of homes
Lot sizebigger than0.11 ac23% of homes16% of homes14% of homes
Year builtnewer than197084% of homes80% of homes64% of homes

About 21 Flood St

How much is 21 Flood St, Waltham, MA worth?

The TopHap Estimate for 21 Flood St, Waltham, MA is $655,373 as of Sep 24, 2026. The likely range is $633,219 to $677,527. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

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

21 Flood St, Waltham, MA last sold on Mar 29, 2017 for $420,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 21 Flood St, Waltham, MA?

21 Flood St, Waltham, MA has 3 bedrooms, 1.5 bathrooms, 1,128 square feet of living space and a 0.11-acre lot.

When was 21 Flood St, Waltham, MA built?

21 Flood St, Waltham, MA was built in 1970, making it 56 years old. It is a colonial home. The building has 2 stories.

What schools serve 21 Flood St, Waltham, MA?

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

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

Among the 6,296 homes in Waltham 02453, it is worth more than 23% of them ($655,373 against a typical $786,408), its price per square foot is higher than 78% of them ($581 against a typical $493), it is bigger than 14% of them (1,128 ft² against a typical 1,867 ft²), its lot is bigger than 16% of them (0.11 ac against a typical 0.15 ac) and it is newer than 80% of them (1970 against a typical 1930). Measured against all of Middlesex County, it is worth more than 33% 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 Flood St, Waltham, MA?

The 2025 property tax bill for 21 Flood St, Waltham, MA was $5,936. The county assessed it at $604,500.

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