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Single Family ResidenceResidential
$1,275,839$285 / 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 Oct 21, 2026
Last sold for $1,100,000 on Oct 8, 2024

21 CASTLE RD

NORTHBOROUGH, MA 01532
4
Beds
4.5
Baths
4,469 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.
5.04 ac
Lot SizeThe size of the land the home sits on, from county records.
2003
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
9
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.3M
$1.2M low$1.4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,100,000 · Oct 8, 2024

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$21,077 (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.$1,479,100 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$438,800
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,040,300
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,309,900
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,375,575

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.40
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
20
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
61
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
87
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
33
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.

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.Colonial
CountyWORCESTER
Lot (acres)The size of the land the home sits on, from county records.5.04
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.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
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(10)

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
Robert E. Melican Middle SchoolB+
Middle · Grades 6–8 · 1.3 mi
E
Lincoln StreetA-
Elementary · Grades KG–5 · 1.5 mi
H
Algonquin Regional High SchoolA+
High · Grades 9–12 · 3.6 mi

District: Northborough School District

Neighborhood · ZIP 01532These 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.31
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 100.68

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.31%
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.1.4%
PopulationHow many people live in this area.16,278
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.868 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$158,286
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$198,404
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.48 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.50%

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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 Castle 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.

  • Among the most valuable homes in Worcester County
  • Costs less per square foot than 94% of homes in Northborough 01532
  • Among the largest homes in Northborough 01532
  • Has a bigger lot than 93% of homes in Northborough 01532
  • Newer than 89% of homes in Northborough 01532

What homes are worth in Northborough 01532

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

This home
$288K$1.4M

This home is worth more than 97% of homes in Northborough 01532.

How it measures up in Northborough 01532

The dot is this home. The mark in the middle is the typical home in Northborough 01532.

Estimated value$1,275,839
CheaperTypical $681,432Pricier

Pricier than 97% of homes nearby

Price per ft²$285
CheaperTypical $370Pricier

Pricier than 6% of homes nearby

Living area4,469 ft²
SmallerTypical 1,809 ft²Bigger

Bigger than almost all homes nearby

Lot size5.04 ac
SmallerTypical 0.56 acBigger

Bigger than 93% of homes nearby

Year built2003
OlderTypical 1975Newer

Newer than 89% of homes nearby

How 21 Castle Rd ranks against every home in each area.
MeasureThis homeNorthborough 01532Worcester County
Estimated valuepricier than$1,275,83997% of homesalmost all homes
Price per ft²pricier than$2856% of homes40% of homes
Living areabigger than4,469 ft²almost all homes98% of homes
Lot sizebigger than5.04 ac93% of homes90% of homes
Year builtnewer than200389% of homes88% of homes

About 21 Castle Rd

How much is 21 Castle Rd, Northborough, MA worth?

The TopHap Estimate for 21 Castle Rd, Northborough, MA is $1,275,839 as of Oct 21, 2026. The likely range is $1,167,482 to $1,384,196. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Castle Rd, Northborough, MA last sell?

21 Castle Rd, Northborough, MA last sold on Oct 8, 2024 for $1,100,000, according to the county's recorded deed. TopHap holds 5 recorded sales for this parcel.

How big is 21 Castle Rd, Northborough, MA?

21 Castle Rd, Northborough, MA has 4 bedrooms, 4.5 bathrooms, 4,469 square feet of living space and a 5.04-acre lot.

When was 21 Castle Rd, Northborough, MA built?

21 Castle Rd, Northborough, MA was built in 2003, making it 23 years old. It is a colonial home. The building has 2 stories.

What schools serve 21 Castle Rd, Northborough, MA?

21 Castle Rd, Northborough, MA is assigned to Robert E. Melican Middle School (middle), rated B+; Lincoln Street (elementary), rated A-; Algonquin Regional High School (high), rated A+. All sit in Northborough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Castle Rd, Northborough, MA compare to other homes in Northborough 01532?

Among the 4,998 homes in Northborough 01532, it is worth more than 97% of them ($1,275,839 against a typical $681,432), its price per square foot is higher than 6% of them ($285 against a typical $370), it is bigger than almost all of them (4,469 ft² against a typical 1,809 ft²), its lot is bigger than 93% of them (5.04 ac against a typical 0.56 ac) and it is newer than 89% of them (2003 against a typical 1975). Measured against all of Worcester County, it is worth more than almost all 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 Castle Rd, Northborough, MA?

The 2025 property tax bill for 21 Castle Rd, Northborough, MA was $21,077. The county assessed it at $1,479,100.

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