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Single Family ResidenceResidential
$483,696$672 / 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 96How 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
Last sold for $105,000 on Aug 26, 1997

21B UNION ST

NATICK, MA 01760
2
Beds
1
Baths
720 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.
4,086 ft²
Lot SizeThe size of the land the home sits on, from county records.
1930
Year BuiltThe year the home was originally built, according to county records.
1
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

$484K
$466K low$501K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$105,000 · Aug 26, 1997

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,071 (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.$424,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$345,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$78,900
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$400,500

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.Bungalow
CountyMiddlesex
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1990
Lot (acres)The size of the land the home sits on, from county records.0.09
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Mat/Raft Foundation (Slab)
HeatingThe type of heating system in the home.Hot Water
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(3)

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
Lilja Elementary SchoolA-
Elementary · Grades KG–4 · 1.0 mi
H
Natick High SchoolA
High · Grades 9–12 · 1.3 mi
M
Wilson Middle SchoolA-
Middle · Grades 5–8 · 1.6 mi

District: Natick School District

Neighborhood · ZIP 01760These 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.79
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.99
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.70

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.35%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.7%
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.37,721
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,380 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$133,738
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$174,842
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

21b Union 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 less than 87% of homes in Middlesex County
  • Costs more per square foot than 92% of homes in Natick 01760
  • Smaller than 98% of homes in Natick 01760
  • Has a smaller lot than 98% of homes in Natick 01760
  • Older than 80% of homes in Natick 01760

What homes are worth in Natick 01760

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

This home
$302K$2M

This home is worth more than 15% of homes in Natick 01760.

How it measures up in Natick 01760

The dot is this home. The mark in the middle is the typical home in Natick 01760.

Estimated value$483,696
CheaperTypical $855,973Pricier

Pricier than 15% of homes nearby

Price per ft²$672
CheaperTypical $490Pricier

Pricier than 92% of homes nearby

Living area720 ft²
SmallerTypical 1,705 ft²Bigger

Bigger than 2% of homes nearby

Lot size4,086 ft²
SmallerTypical 0.3 acBigger

Bigger than 2% of homes nearby

Year built1930
OlderTypical 1956Newer

Newer than 20% of homes nearby

How 21b Union St ranks against every home in each area.
MeasureThis homeNatick 01760Middlesex County
Estimated valuepricier than$483,69615% of homes13% of homes
Price per ft²pricier than$67292% of homes83% of homes
Living areabigger than720 ft²2% of homes3% of homes
Lot sizebigger than4,086 ft²2% of homes10% of homes
Year builtnewer than193020% of homes32% of homes

About 21b Union St

How much is 21b Union St, Natick, MA worth?

The TopHap Estimate for 21b Union St, Natick, MA is $483,696 as of Aug 30, 2026. The likely range is $466,402 to $500,990. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21b Union St, Natick, MA last sell?

21b Union St, Natick, MA last sold on Aug 26, 1997 for $105,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 21b Union St, Natick, MA?

21b Union St, Natick, MA has 2 bedrooms, 1 bathrooms, 720 square feet of living space and a 0.09-acre lot.

When was 21b Union St, Natick, MA built?

21b Union St, Natick, MA was built in 1930, making it 96 years old. It is a bungalow home. The building has 1 story.

What schools serve 21b Union St, Natick, MA?

21b Union St, Natick, MA is assigned to Lilja Elementary School (elementary), rated A-; Natick High School (high), rated A; Wilson Middle School (middle), rated A-. All sit in Natick School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21b Union St, Natick, MA compare to other homes in Natick 01760?

Among the 12,050 homes in Natick 01760, it is worth more than 15% of them ($483,696 against a typical $855,973), its price per square foot is higher than 92% of them ($672 against a typical $490), it is bigger than 2% of them (720 ft² against a typical 1,705 ft²), its lot is bigger than 2% of them (4,086 ft² against a typical 0.3 ac) and it is newer than 20% of them (1930 against a typical 1956). Measured against all of Middlesex County, it is worth more than 13% 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 21b Union St, Natick, MA?

The 2025 property tax bill for 21b Union St, Natick, MA was $5,071. The county assessed it at $424,000.

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