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Single Family ResidenceResidential
$802,205$389 / 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 94How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026
Last sold for $698,000 on Jun 23, 2023

21 SWAN LN

BILLERICA, MA 01821
3
Beds
2
Baths
2,060 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.
0.39 ac
Lot SizeThe size of the land the home sits on, from county records.
1996
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
7
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$802K
$754K low$850K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$698,000 · Jun 23, 2023

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,223 (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.$635,300 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$291,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$344,300
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$750,975

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.39
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(11)

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.

M
Locke Middle SchoolB+
Middle · Grades 5–7 · 1.2 mi
H
Billerica Memorial High SchoolC
High · Grades 8–12 · 1.5 mi

District: Billerica School District

Neighborhood · ZIP 01821These 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.40
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.100
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.82

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.98%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.31,495
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,857 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$133,460
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$152,991
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 Swan Ln 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 80% of homes in Billerica 01821
  • Costs less per square foot than 70% of homes in Middlesex County
  • Newer than 86% of homes in Middlesex County

What homes are worth in Billerica 01821

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

This home
$287K$1.1M

This home is worth more than 80% of homes in Billerica 01821.

How it measures up in Billerica 01821

The dot is this home. The mark in the middle is the typical home in Billerica 01821.

Estimated value$802,205
CheaperTypical $672,794Pricier

Pricier than 80% of homes nearby

Price per ft²$389
CheaperTypical $368Pricier

Pricier than 63% of homes nearby

Living area2,060 ft²
SmallerTypical 1,877 ft²Bigger

Bigger than 62% of homes nearby

Lot size0.39 ac
SmallerTypical 0.57 acBigger

Bigger than 40% of homes nearby

Year built1996
OlderTypical 1970Newer

Newer than 85% of homes nearby

How 21 Swan Ln ranks against every home in each area.
MeasureThis homeBillerica 01821Middlesex County
Estimated valuepricier than$802,20580% of homes52% of homes
Price per ft²pricier than$38963% of homes30% of homes
Living areabigger than2,060 ft²62% of homes59% of homes
Lot sizebigger than0.39 ac40% of homes57% of homes
Year builtnewer than199685% of homes86% of homes

About 21 Swan Ln

How much is 21 Swan Ln, Billerica, MA worth?

The TopHap Estimate for 21 Swan Ln, Billerica, MA is $802,205 as of Jul 14, 2026. The likely range is $754,414 to $849,996. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Swan Ln, Billerica, MA last sell?

21 Swan Ln, Billerica, MA last sold on Jun 23, 2023 for $698,000, according to the county's recorded deed. TopHap holds 7 recorded sales for this parcel.

How big is 21 Swan Ln, Billerica, MA?

21 Swan Ln, Billerica, MA has 3 bedrooms, 2 bathrooms, 2,060 square feet of living space and a 0.39-acre lot.

When was 21 Swan Ln, Billerica, MA built?

21 Swan Ln, Billerica, MA was built in 1996, making it 30 years old. The building has 2 stories.

What schools serve 21 Swan Ln, Billerica, MA?

21 Swan Ln, Billerica, MA is assigned to Locke Middle School (middle), rated B+; Billerica Memorial High School (high), rated C. All sit in Billerica School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Swan Ln, Billerica, MA compare to other homes in Billerica 01821?

Among the 10,003 homes in Billerica 01821, it is worth more than 80% of them ($802,205 against a typical $672,794), its price per square foot is higher than 63% of them ($389 against a typical $368), it is bigger than 62% of them (2,060 ft² against a typical 1,877 ft²), its lot is bigger than 40% of them (0.39 ac against a typical 0.57 ac) and it is newer than 85% of them (1996 against a typical 1970). Measured against all of Middlesex County, it is worth more than 52% 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 Swan Ln, Billerica, MA?

The 2025 property tax bill for 21 Swan Ln, Billerica, MA was $7,223. The county assessed it at $635,300.

More homes on Swan Ln

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