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CondominiumResidential
$681,886$472 / 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 94How 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 $346,000 on Mar 28, 2003

18 UNION ST

NATICK, MA 01760
Building report
3
Beds
1.5
Baths
1,446 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.
1.58 ac
Lot SizeThe size of the land the home sits on, from county records.
1990
Year BuiltThe year the home was originally built, according to county records.
2
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

$682K
$638K low$726K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$346,000 · Mar 28, 2003

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,973 (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.$583,000 (2025)
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$583,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$653,695

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Condominium
CountyMIDDLESEX
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
Lilja Elementary SchoolB
Elementary · Grades KG–4 · 0.9 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

18 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 77% of homes in Natick 01760
  • Smaller than 68% of homes in Middlesex County
  • Has a bigger lot than 85% of homes in Middlesex County
  • Newer than 82% of homes in Middlesex County

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
$299K$2M

This home is worth more than 23% 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$681,886
CheaperTypical $862,541Pricier

Pricier than 23% of homes nearby

Price per ft²$472
CheaperTypical $495Pricier

Pricier than 40% of homes nearby

Living area1,446 ft²
SmallerTypical 1,705 ft²Bigger

Bigger than 34% of homes nearby

Lot size1.58 ac
SmallerTypical 0.36 acBigger

Bigger than 81% of homes nearby

Year built1990
OlderTypical 1955Newer

Newer than 80% of homes nearby

How 18 Union St ranks against every home in each area.
MeasureThis homeNatick 01760Middlesex County
Estimated valuepricier than$681,88623% of homes37% of homes
Price per ft²pricier than$47240% of homes53% of homes
Living areabigger than1,446 ft²34% of homes32% of homes
Lot sizebigger than1.58 ac81% of homes85% of homes
Year builtnewer than199080% of homes82% of homes

About 18 Union St

How much is 18 Union St, Natick, MA worth?

The TopHap Estimate for 18 Union St, Natick, MA is $681,886 as of Oct 21, 2026. The likely range is $638,134 to $725,638. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 18 Union St, Natick, MA last sell?

18 Union St, Natick, MA last sold on Mar 28, 2003 for $346,000, according to the county's recorded deed.

How big is 18 Union St, Natick, MA?

18 Union St, Natick, MA has 3 bedrooms, 1.5 bathrooms and 1,446 square feet of living space.

When was 18 Union St, Natick, MA built?

18 Union St, Natick, MA was built in 1990, making it 36 years old. The building has 2 stories.

What schools serve 18 Union St, Natick, MA?

18 Union St, Natick, MA is assigned to Lilja Elementary School (elementary), rated B; 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 18 Union St, Natick, MA compare to other homes in Natick 01760?

Among the 12,050 homes in Natick 01760, it is worth more than 23% of them ($681,886 against a typical $862,541), its price per square foot is higher than 40% of them ($472 against a typical $495), it is bigger than 34% of them (1,446 ft² against a typical 1,705 ft²), its lot is bigger than 81% of them (1.58 ac against a typical 0.36 ac) and it is newer than 80% of them (1990 against a typical 1955). Measured against all of Middlesex County, it is worth more than 37% 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 18 Union St, Natick, MA?

The 2025 property tax bill for 18 Union St, Natick, MA was $6,973. The county assessed it at $583,000.

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