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Single Family ResidenceResidential
$468,305$270 / 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 90How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $450,000 on Dec 18, 2025

20 FLAGG ST

BOYLSTON, MA 01505
3
Beds
2
Baths
1,733 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.
0.17 ac
Lot SizeThe size of the land the home sits on, from county records.
1955
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

$468K
$423K low$513K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$450,000 · Dec 18, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,121 (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.$370,300 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$139,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$231,200
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$337,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$522,880

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
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.1985
Lot (acres)The size of the land the home sits on, from county records.0.17
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
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(1)

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
Boylston Elementary SchoolB-
Elementary · Grades KG–5 · 1.5 mi
M
Tahanto Regional High SchoolA-
Middle · Grades 6–12 · 4.5 mi

District: Berlin-Boylston School District

Neighborhood · ZIP 01505These 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.43
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 100.65

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.30%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.3%
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.4,451
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.262 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$129,631
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$161,917
Average tempThe average temperature here across a full year.47°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

20 Flagg 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 Boylston 01505
  • Costs less per square foot than 94% of homes in Boylston 01505
  • Among the smallest lots in Boylston 01505
  • Older than 76% of homes in Boylston 01505

What homes are worth in Boylston 01505

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

This home
$346K$1.6M

This home is worth more than 23% of homes in Boylston 01505.

How it measures up in Boylston 01505

The dot is this home. The mark in the middle is the typical home in Boylston 01505.

Estimated value$468,305
CheaperTypical $645,250Pricier

Pricier than 23% of homes nearby

Price per ft²$270
CheaperTypical $345Pricier

Pricier than 6% of homes nearby

Living area1,733 ft²
SmallerTypical 1,885 ft²Bigger

Bigger than 44% of homes nearby

Lot size0.17 ac
SmallerTypical 1.16 acBigger

Smaller than almost all homes nearby

Year built1955
OlderTypical 1977Newer

Newer than 24% of homes nearby

How 20 Flagg St ranks against every home in each area.
MeasureThis homeBoylston 01505Worcester County
Estimated valuepricier than$468,30523% of homes47% of homes
Price per ft²pricier than$2706% of homes30% of homes
Living areabigger than1,733 ft²44% of homes52% of homes
Lot sizebigger than0.17 acalmost no homes14% of homes
Year builtnewer than195524% of homes39% of homes

About 20 Flagg St

How much is 20 Flagg St, Boylston, MA worth?

The TopHap Estimate for 20 Flagg St, Boylston, MA is $468,305 as of Sep 24, 2026. The likely range is $423,248 to $513,362. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Flagg St, Boylston, MA last sell?

20 Flagg St, Boylston, MA last sold on Dec 18, 2025 for $450,000, according to the county's recorded deed.

How big is 20 Flagg St, Boylston, MA?

20 Flagg St, Boylston, MA has 3 bedrooms, 2 bathrooms, 1,733 square feet of living space and a 0.17-acre lot.

When was 20 Flagg St, Boylston, MA built?

20 Flagg St, Boylston, MA was built in 1955, making it 71 years old. It is a colonial home. The building has 1 story.

What schools serve 20 Flagg St, Boylston, MA?

20 Flagg St, Boylston, MA is assigned to Boylston Elementary School (elementary), rated B-; Tahanto Regional High School (middle), rated A-. All sit in Berlin-Boylston School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Flagg St, Boylston, MA compare to other homes in Boylston 01505?

Among the 1,864 homes in Boylston 01505, it is worth more than 23% of them ($468,305 against a typical $645,250), its price per square foot is higher than 6% of them ($270 against a typical $345), it is bigger than 44% of them (1,733 ft² against a typical 1,885 ft²), its lot is bigger than almost none of them (0.17 ac against a typical 1.16 ac) and it is newer than 24% of them (1955 against a typical 1977). Measured against all of Worcester County, it is worth more than 47% 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 20 Flagg St, Boylston, MA?

The 2025 property tax bill for 20 Flagg St, Boylston, MA was $5,121. The county assessed it at $370,300.

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