Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$326,348$323 / 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 97How 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 $97,500 on Jun 1, 1988

21 BERTHA AVE

GARDNER, MA 01440
3
Beds
1
Baths
1,009 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.
0.24 ac
Lot SizeThe size of the land the home sits on, from county records.
1948
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$326K
$315K low$337K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$97,500 · Jun 1, 1988

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,620 (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.$252,100 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$68,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$183,200
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$252,100

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
CountyWorcester
Lot (acres)The size of the land the home sits on, from county records.0.24
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Baseboard

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.

H
Gardner High SchoolC-
High · Grades 8–12 · 0.3 mi
M
Gardner Middle SchoolD-
Middle · Grades 5–7 · 0.4 mi
E
Gardner Elementary SchoolD-
Elementary · Grades PK–4 · 0.7 mi

District: Gardner School District

Neighborhood · ZIP 01440These 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.123
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.95
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.66

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.93%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.13%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.15%
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.21,657
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.854 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$62,433
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$80,787
Average tempThe average temperature here across a full year.45°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.50%

Owner Tools

Do you own this home?
Claim this home

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 Bertha Ave 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 89% of homes in Worcester County
  • Costs more per square foot than 79% of homes in Gardner 01440
  • Smaller than 90% of homes in Worcester County
  • Has a smaller lot than 74% of homes in Worcester County
  • Older than 69% of homes in Worcester County

What homes are worth in Gardner 01440

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

This home
$157K$643K

This home is worth more than 28% of homes in Gardner 01440.

How it measures up in Gardner 01440

The dot is this home. The mark in the middle is the typical home in Gardner 01440.

Estimated value$326,348
CheaperTypical $373,789Pricier

Pricier than 28% of homes nearby

Price per ft²$323
CheaperTypical $267Pricier

Pricier than 79% of homes nearby

Living area1,009 ft²
SmallerTypical 1,489 ft²Bigger

Bigger than 16% of homes nearby

Lot size0.24 ac
SmallerTypical 0.29 acBigger

Bigger than 38% of homes nearby

Year built1948
OlderTypical 1949Newer

Newer than 49% of homes nearby

How 21 Bertha Ave ranks against every home in each area.
MeasureThis homeGardner 01440Worcester County
Estimated valuepricier than$326,34828% of homes11% of homes
Price per ft²pricier than$32379% of homes59% of homes
Living areabigger than1,009 ft²16% of homes10% of homes
Lot sizebigger than0.24 ac38% of homes26% of homes
Year builtnewer than194849% of homes31% of homes

About 21 Bertha Ave

How much is 21 Bertha Ave, Gardner, MA worth?

The TopHap Estimate for 21 Bertha Ave, Gardner, MA is $326,348 as of Sep 24, 2026. The likely range is $315,214 to $337,482. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Bertha Ave, Gardner, MA last sell?

21 Bertha Ave, Gardner, MA last sold on Jun 1, 1988 for $97,500, according to the county's recorded deed.

How big is 21 Bertha Ave, Gardner, MA?

21 Bertha Ave, Gardner, MA has 3 bedrooms, 1 bathrooms, 1,009 square feet of living space and a 0.24-acre lot.

When was 21 Bertha Ave, Gardner, MA built?

21 Bertha Ave, Gardner, MA was built in 1948, making it 78 years old. It is a cape cod home. The building has 1 story.

What schools serve 21 Bertha Ave, Gardner, MA?

21 Bertha Ave, Gardner, MA is assigned to Gardner High School (high), rated C-; Gardner Middle School (middle), rated D-; Gardner Elementary School (elementary), rated D-. All sit in Gardner School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Bertha Ave, Gardner, MA compare to other homes in Gardner 01440?

Among the 5,706 homes in Gardner 01440, it is worth more than 28% of them ($326,348 against a typical $373,789), its price per square foot is higher than 79% of them ($323 against a typical $267), it is bigger than 16% of them (1,009 ft² against a typical 1,489 ft²), its lot is bigger than 38% of them (0.24 ac against a typical 0.29 ac) and it is newer than 49% of them (1948 against a typical 1949). Measured against all of Worcester County, it is worth more than 11% 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 Bertha Ave, Gardner, MA?

The 2025 property tax bill for 21 Bertha Ave, Gardner, MA was $3,620. The county assessed it at $252,100.

More homes on Bertha Ave

Closest homes

More homes in Gardner 01440

Assigned schools

Explore the area

See this home in context

Open 21 Bertha Ave on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map