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Single Family ResidenceResidential
$496,407$421 / 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 95How 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 THOMAS DR

CHELMSFORD, MA 01824
3
Beds
1
Baths
1,178 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.
1.54 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.
1
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

$496K
$471K low$522K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,199 (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.$446,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$347,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$98,100
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$696,825

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.Raised Ranch
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.1.54
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

Transaction History(7)

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
Col Moses Parker SchoolB
Middle · Grades 5–6 · 1.3 mi
H
Chelmsford High SchoolA
High · Grades 9–12 · 1.6 mi
E
Byam SchoolB+
Elementary · Grades KG–4 · 2.0 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

21 Thomas Dr 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 88% of homes in Chelmsford 01824
  • Smaller than 81% of homes in Chelmsford 01824
  • Has a bigger lot than 86% of homes in Middlesex County
  • Newer than 66% 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
$322K$1.2M

This home is worth more than 12% 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$496,407
CheaperTypical $684,657Pricier

Pricier than 12% of homes nearby

Price per ft²$421
CheaperTypical $400Pricier

Pricier than 60% of homes nearby

Living area1,178 ft²
SmallerTypical 1,668 ft²Bigger

Bigger than 19% of homes nearby

Lot size1.54 ac
SmallerTypical 0.79 acBigger

Bigger than 83% of homes nearby

Year built1970
OlderTypical 1965Newer

Newer than 66% of homes nearby

How 21 Thomas Dr ranks against every home in each area.
MeasureThis homeChelmsford 01824Middlesex County
Estimated valuepricier than$496,40712% of homes15% of homes
Price per ft²pricier than$42160% of homes40% of homes
Living areabigger than1,178 ft²19% of homes19% of homes
Lot sizebigger than1.54 ac83% of homes86% of homes
Year builtnewer than197066% of homes64% of homes

About 21 Thomas Dr

How much is 21 Thomas Dr, Chelmsford, MA worth?

The TopHap Estimate for 21 Thomas Dr, Chelmsford, MA is $496,407 as of Aug 30, 2026. The likely range is $470,933 to $521,881. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Thomas Dr, Chelmsford, MA last sell?

21 Thomas Dr, Chelmsford, MA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 Thomas Dr, Chelmsford, MA?

21 Thomas Dr, Chelmsford, MA has 3 bedrooms, 1 bathrooms, 1,178 square feet of living space and a 1.54-acre lot.

When was 21 Thomas Dr, Chelmsford, MA built?

21 Thomas Dr, Chelmsford, MA was built in 1970, making it 56 years old. It is a raised ranch home. The building has 1 story.

What schools serve 21 Thomas Dr, Chelmsford, MA?

21 Thomas Dr, Chelmsford, MA is assigned to Col Moses Parker School (middle), rated B; Chelmsford High School (high), rated A; Byam School (elementary), rated B+. All sit in Chelmsford School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Thomas Dr, Chelmsford, MA compare to other homes in Chelmsford 01824?

Among the 8,861 homes in Chelmsford 01824, it is worth more than 12% of them ($496,407 against a typical $684,657), its price per square foot is higher than 60% of them ($421 against a typical $400), it is bigger than 19% of them (1,178 ft² against a typical 1,668 ft²), its lot is bigger than 83% of them (1.54 ac against a typical 0.79 ac) and it is newer than 66% of them (1970 against a typical 1965). Measured against all of Middlesex County, it is worth more than 15% 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 Thomas Dr, Chelmsford, MA?

The 2025 property tax bill for 21 Thomas Dr, Chelmsford, MA was $6,199. The county assessed it at $446,000.

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