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Single Family ResidenceResidential
$767,817$405 / 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 92How 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 $730,000 on Mar 11, 2025

1 KNOLL ST

BILLERICA, MA 01821
1
Beds
2
Baths
1,898 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.
0.16 ac
Lot SizeThe size of the land the home sits on, from county records.
1986
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
4
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$768K
$704K low$832K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$730,000 · Mar 11, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,518 (2026)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$561,400 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$270,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$290,800
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$553,400
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$689,605

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.8 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.17
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
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(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
Thomas DitsonB
Elementary · Grades KG–4 · 0.4 mi
M
Locke Middle SchoolB
Middle · Grades 5–7 · 1.3 mi
H
Billerica Memorial High SchoolC+
High · Grades 8–12 · 2.8 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

1 Knoll 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 more than 73% of homes in Billerica 01821
  • Costs more per square foot than 66% of homes in Billerica 01821
  • Has a smaller lot than 92% of homes in Billerica 01821
  • Newer than 78% 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
$280K$1.1M

This home is worth more than 73% 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$767,817
CheaperTypical $682,153Pricier

Pricier than 73% of homes nearby

Price per ft²$405
CheaperTypical $375Pricier

Pricier than 66% of homes nearby

Living area1,898 ft²
SmallerTypical 1,880 ft²Bigger

Bigger than 51% of homes nearby

Lot size0.16 ac
SmallerTypical 0.57 acBigger

Bigger than 8% of homes nearby

Year built1986
OlderTypical 1970Newer

Newer than 76% of homes nearby

How 1 Knoll St ranks against every home in each area.
MeasureThis homeBillerica 01821Middlesex County
Estimated valuepricier than$767,81773% of homes48% of homes
Price per ft²pricier than$40566% of homes35% of homes
Living areabigger than1,898 ft²51% of homes53% of homes
Lot sizebigger than0.16 ac8% of homes28% of homes
Year builtnewer than198676% of homes78% of homes

About 1 Knoll St

How much is 1 Knoll St, Billerica, MA worth?

The TopHap Estimate for 1 Knoll St, Billerica, MA is $767,817 as of Sep 24, 2026. The likely range is $703,863 to $831,771. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 1 Knoll St, Billerica, MA last sell?

1 Knoll St, Billerica, MA last sold on Mar 11, 2025 for $730,000, according to the county's recorded deed.

How big is 1 Knoll St, Billerica, MA?

1 Knoll St, Billerica, MA has 1 bedrooms, 2 bathrooms, 1,898 square feet of living space and a 0.17-acre lot.

When was 1 Knoll St, Billerica, MA built?

1 Knoll St, Billerica, MA was built in 1986, making it 40 years old. The building has 2 stories.

What schools serve 1 Knoll St, Billerica, MA?

1 Knoll St, Billerica, MA is assigned to Thomas Ditson (elementary), rated B; 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 1 Knoll St, Billerica, MA compare to other homes in Billerica 01821?

Among the 10,006 homes in Billerica 01821, it is worth more than 73% of them ($767,817 against a typical $682,153), its price per square foot is higher than 66% of them ($405 against a typical $375), it is bigger than 51% of them (1,898 ft² against a typical 1,880 ft²), its lot is bigger than 8% of them (0.16 ac against a typical 0.57 ac) and it is newer than 76% of them (1986 against a typical 1970). Measured against all of Middlesex County, it is worth more than 48% 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 1 Knoll St, Billerica, MA?

The 2026 property tax bill for 1 Knoll St, Billerica, MA was $6,518. The county assessed it at $561,400.

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