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Single Family ResidenceResidential
$512,653$269 / 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 Aug 30, 2026

21 MASON RD

ASHBY, MA 01431
3
Beds
2.5
Baths
1,908 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.
2 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.
7
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$513K
$474K low$552K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,432 (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.$422,300 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$67,700
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$354,600
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$341,050

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.10 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.1 percent flood zone

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.Cape Cod
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.2.00
ConstructionThe main material the home's frame and walls are built from.Concrete
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Hot Water
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.No

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
Ashby Elementary SchoolB-
Elementary · Grades KG–4 · 0.4 mi
M
Hawthorne Brook Middle SchoolC-
Middle · Grades 5–8 · 5.8 mi
H
North Middlesex Regional High SchoolB-
High · Grades 9–12 · 8.1 mi

District: North Middlesex School District

Neighborhood · ZIP 01431These 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.92
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.93
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.74

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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.23%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.2.9%
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.3,266
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.136 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$108,151
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$136,531
Average tempThe average temperature here across a full year.46°F
Annual precipHow much rain and melted snow falls here in a typical year.49 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 Mason Rd 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 84% of homes in Middlesex County
  • Costs less per square foot than 95% of homes in Middlesex County
  • Has a bigger lot than 89% of homes in Middlesex County
  • Newer than 78% of homes in Middlesex County

What homes are worth in Ashby 01431

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

This home
$192K$799K

This home is worth more than 67% of homes in Ashby 01431.

How it measures up in Ashby 01431

The dot is this home. The mark in the middle is the typical home in Ashby 01431.

Estimated value$512,653
CheaperTypical $455,259Pricier

Pricier than 67% of homes nearby

Price per ft²$269
CheaperTypical $260Pricier

Pricier than 57% of homes nearby

Living area1,908 ft²
SmallerTypical 1,762 ft²Bigger

Bigger than 59% of homes nearby

Lot size2 ac
SmallerTypical 2.11 acBigger

Bigger than 47% of homes nearby

Year built1986
OlderTypical 1972Newer

Newer than 64% of homes nearby

How 21 Mason Rd ranks against every home in each area.
MeasureThis homeAshby 01431Middlesex County
Estimated valuepricier than$512,65367% of homes16% of homes
Price per ft²pricier than$26957% of homes5% of homes
Living areabigger than1,908 ft²59% of homes53% of homes
Lot sizebigger than2 ac47% of homes89% of homes
Year builtnewer than198664% of homes78% of homes

About 21 Mason Rd

How much is 21 Mason Rd, Ashby, MA worth?

The TopHap Estimate for 21 Mason Rd, Ashby, MA is $512,653 as of Aug 30, 2026. The likely range is $473,659 to $551,647. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Mason Rd, Ashby, MA last sell?

21 Mason Rd, Ashby, MA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 Mason Rd, Ashby, MA?

21 Mason Rd, Ashby, MA has 3 bedrooms, 2.5 bathrooms, 1,908 square feet of living space and a 2.00-acre lot.

When was 21 Mason Rd, Ashby, MA built?

21 Mason Rd, Ashby, MA was built in 1986, making it 40 years old. It is a cape cod home. The building has 2 stories.

What schools serve 21 Mason Rd, Ashby, MA?

21 Mason Rd, Ashby, MA is assigned to Ashby Elementary School (elementary), rated B-; Hawthorne Brook Middle School (middle), rated C-; North Middlesex Regional High School (high), rated B-. All sit in North Middlesex School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Mason Rd, Ashby, MA compare to other homes in Ashby 01431?

Among the 1,214 homes in Ashby 01431, it is worth more than 67% of them ($512,653 against a typical $455,259), its price per square foot is higher than 57% of them ($269 against a typical $260), it is bigger than 59% of them (1,908 ft² against a typical 1,762 ft²), its lot is bigger than 47% of them (2 ac against a typical 2.11 ac) and it is newer than 64% of them (1986 against a typical 1972). Measured against all of Middlesex County, it is worth more than 16% 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 Mason Rd, Ashby, MA?

The 2025 property tax bill for 21 Mason Rd, Ashby, MA was $6,432. The county assessed it at $422,300.

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