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Single Family ResidenceResidential
$964,796$332 / 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 $500,000 on Nov 12, 2020

20 HAROLD ST

CHELMSFORD, MA 01824
4
Beds
2
Baths
2,902 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.
0.53 ac
Lot SizeThe size of the land the home sits on, from county records.
1962
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$965K
$890K low$1M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$500,000 · Nov 12, 2020

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$10,923 (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.$823,100 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$345,600
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$477,500
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$832,600
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,029,895

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.0.53
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
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck

Transaction History(5)

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
South RowA
Elementary · Grades KG–4 · 0.8 mi
M
McCarthy Middle SchoolB+
Middle · Grades 7–8 · 2.6 mi
H
Chelmsford High SchoolA-
High · Grades 9–12 · 3.0 mi

District: Chelmsford School District

Neighborhood · ZIP 01824These 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.68
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 100.81

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.33%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.9%
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.27,961
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,525 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$133,207
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$151,835
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.45 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 Harold 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 92% of homes in Chelmsford 01824
  • Costs less per square foot than 85% of homes in Middlesex County
  • Bigger than 92% of homes in Chelmsford 01824
  • Has a smaller lot than 67% of homes in Chelmsford 01824

What homes are worth in Chelmsford 01824

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

This home
$303K$1.2M

This home is worth more than 92% of homes in Chelmsford 01824.

How it measures up in Chelmsford 01824

The dot is this home. The mark in the middle is the typical home in Chelmsford 01824.

Estimated value$964,796
CheaperTypical $689,935Pricier

Pricier than 92% of homes nearby

Price per ft²$332
CheaperTypical $400Pricier

Pricier than 18% of homes nearby

Living area2,902 ft²
SmallerTypical 1,672 ft²Bigger

Bigger than 92% of homes nearby

Lot size0.53 ac
SmallerTypical 0.79 acBigger

Bigger than 33% of homes nearby

Year built1962
OlderTypical 1965Newer

Newer than 42% of homes nearby

How 20 Harold St ranks against every home in each area.
MeasureThis homeChelmsford 01824Middlesex County
Estimated valuepricier than$964,79692% of homes68% of homes
Price per ft²pricier than$33218% of homes15% of homes
Living areabigger than2,902 ft²92% of homes83% of homes
Lot sizebigger than0.53 ac33% of homes66% of homes
Year builtnewer than196242% of homes56% of homes

About 20 Harold St

How much is 20 Harold St, Chelmsford, MA worth?

The TopHap Estimate for 20 Harold St, Chelmsford, MA is $964,796 as of Sep 24, 2026. The likely range is $889,831 to $1,039,761. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Harold St, Chelmsford, MA last sell?

20 Harold St, Chelmsford, MA last sold on Nov 12, 2020 for $500,000, according to the county's recorded deed.

How big is 20 Harold St, Chelmsford, MA?

20 Harold St, Chelmsford, MA has 4 bedrooms, 2 bathrooms, 2,902 square feet of living space and a 0.53-acre lot.

When was 20 Harold St, Chelmsford, MA built?

20 Harold St, Chelmsford, MA was built in 1962, making it 64 years old. It is a colonial home. The building has 1 story.

What schools serve 20 Harold St, Chelmsford, MA?

20 Harold St, Chelmsford, MA is assigned to South Row (elementary), rated A; McCarthy Middle School (middle), rated B+; Chelmsford High School (high), rated A-. All sit in Chelmsford School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Harold St, Chelmsford, MA compare to other homes in Chelmsford 01824?

Among the 8,861 homes in Chelmsford 01824, it is worth more than 92% of them ($964,796 against a typical $689,935), its price per square foot is higher than 18% of them ($332 against a typical $400), it is bigger than 92% of them (2,902 ft² against a typical 1,672 ft²), its lot is bigger than 33% of them (0.53 ac against a typical 0.79 ac) and it is newer than 42% of them (1962 against a typical 1965). Measured against all of Middlesex County, it is worth more than 68% 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 Harold St, Chelmsford, MA?

The 2026 property tax bill for 20 Harold St, Chelmsford, MA was $10,923. The county assessed it at $823,100.

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