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Single Family ResidenceResidential
$596,625$513 / 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 93How 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

21 CAROL AVE

BURLINGTON, MA 01803
3
Beds
1.5
Baths
1,162 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.
0.23 ac
Lot SizeThe size of the land the home sits on, from county records.
1964
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

$597K
$558K low$636K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,203 (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.$600,800 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$391,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$209,800
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$789,735

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.7 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal

Scores 0–100; higher = greater projected risk.

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.Split Level
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.23
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
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, Basement
PoolWhether the property has a pool, and what kind, such as in-ground.In-Ground Pool

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
Memorial Elementary SchoolC+
Elementary · Grades KG–5 · 1.0 mi
M
Marshall Simonds Middle SchoolA-
Middle · Grades 6–8 · 1.0 mi
H
Burlington High SchoolB
High · Grades 9–12 · 1.2 mi

District: Burlington School District

Neighborhood · ZIP 01803These 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.59
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.106
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.79

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.36%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.3%
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.26,627
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,344 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$134,239
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$162,937
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 Carol Ave 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 94% of homes in Burlington 01803
  • Costs more per square foot than 79% of homes in Burlington 01803
  • Smaller than 88% of homes in Burlington 01803
  • Has a smaller lot than 96% of homes in Burlington 01803

What homes are worth in Burlington 01803

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

This home
$416K$1.7M

This home is worth more than 6% of homes in Burlington 01803.

How it measures up in Burlington 01803

The dot is this home. The mark in the middle is the typical home in Burlington 01803.

Estimated value$596,625
CheaperTypical $802,423Pricier

Pricier than 6% of homes nearby

Price per ft²$513
CheaperTypical $436Pricier

Pricier than 79% of homes nearby

Living area1,162 ft²
SmallerTypical 1,864 ft²Bigger

Bigger than 12% of homes nearby

Lot size0.23 ac
SmallerTypical 0.46 acBigger

Bigger than 4% of homes nearby

Year built1964
OlderTypical 1964Newer

Newer than 52% of homes nearby

How 21 Carol Ave ranks against every home in each area.
MeasureThis homeBurlington 01803Middlesex County
Estimated valuepricier than$596,6256% of homes25% of homes
Price per ft²pricier than$51379% of homes62% of homes
Living areabigger than1,162 ft²12% of homes18% of homes
Lot sizebigger than0.23 ac4% of homes38% of homes
Year builtnewer than196452% of homes58% of homes

About 21 Carol Ave

How much is 21 Carol Ave, Burlington, MA worth?

The TopHap Estimate for 21 Carol Ave, Burlington, MA is $596,625 as of Aug 30, 2026. The likely range is $557,591 to $635,659. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Carol Ave, Burlington, MA last sell?

21 Carol Ave, Burlington, MA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 Carol Ave, Burlington, MA?

21 Carol Ave, Burlington, MA has 3 bedrooms, 1.5 bathrooms, 1,162 square feet of living space and a 0.23-acre lot.

When was 21 Carol Ave, Burlington, MA built?

21 Carol Ave, Burlington, MA was built in 1964, making it 62 years old. It is a split level home. The building has 1 story.

What schools serve 21 Carol Ave, Burlington, MA?

21 Carol Ave, Burlington, MA is assigned to Memorial Elementary School (elementary), rated C+; Marshall Simonds Middle School (middle), rated A-; Burlington High School (high), rated B. All sit in Burlington School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Carol Ave, Burlington, MA compare to other homes in Burlington 01803?

Among the 7,276 homes in Burlington 01803, it is worth more than 6% of them ($596,625 against a typical $802,423), its price per square foot is higher than 79% of them ($513 against a typical $436), it is bigger than 12% of them (1,162 ft² against a typical 1,864 ft²), its lot is bigger than 4% of them (0.23 ac against a typical 0.46 ac) and it is newer than 52% of them (1964 against a typical 1964). Measured against all of Middlesex County, it is worth more than 25% 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 Carol Ave, Burlington, MA?

The 2025 property tax bill for 21 Carol Ave, Burlington, MA was $5,203. The county assessed it at $600,800.

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Assigned schools

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