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Single Family ResidenceResidential
$513,160$586 / 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 95How 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 $108,000 on Apr 4, 1994

20 PORTER ST

SHIRLEY, MA 01464
2
Beds
1
Baths
875 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.
0.11 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.
4
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$513K
$487K low$539K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$108,000 · Apr 4, 1994

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,446 (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.$342,800 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$129,600
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$213,200
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$302,500

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.Cape Cod
CountyMiddlesex
Lot (acres)The size of the land the home sits on, from county records.0.11
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air
PoolWhether the property has a pool, and what kind, such as in-ground.In-Ground Pool

Transaction History(4)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Foreclosure Filings(1)

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Lura A White Elementary SchoolB-
Elementary · Grades KG–5 · 0.4 mi
M
Ayer Shirley Regional Middle SchoolB
Middle · Grades 6–8 · 0.6 mi
H
Ayer Shirley Regional High SchoolB
High · Grades 9–12 · 4.1 mi

District: Ayer-Shirley School District

Neighborhood · ZIP 01464These 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.89
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.102
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.74

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.22%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.1.5%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.7,097
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.449 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$120,824
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$144,771
Average tempThe average temperature here across a full year.47°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

20 Porter 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 84% of homes in Middlesex County
  • Among the highest price per square foot in Shirley 01464
  • Smaller than 98% of homes in Shirley 01464
  • Among the smallest lots in Shirley 01464
  • Older than 80% of homes in Shirley 01464

What homes are worth in Shirley 01464

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

This home
$300K$829K

This home is worth more than 51% of homes in Shirley 01464.

How it measures up in Shirley 01464

The dot is this home. The mark in the middle is the typical home in Shirley 01464.

Estimated value$513,160
CheaperTypical $508,592Pricier

Pricier than 51% of homes nearby

Price per ft²$586
CheaperTypical $266Pricier

Pricier than almost all homes nearby

Living area875 ft²
SmallerTypical 1,939 ft²Bigger

Bigger than 2% of homes nearby

Lot size0.11 ac
SmallerTypical 0.92 acBigger

Smaller than almost all homes nearby

Year built1948
OlderTypical 1985Newer

Newer than 20% of homes nearby

How 20 Porter St ranks against every home in each area.
MeasureThis homeShirley 01464Middlesex County
Estimated valuepricier than$513,16051% of homes16% of homes
Price per ft²pricier than$586almost all homes74% of homes
Living areabigger than875 ft²2% of homes7% of homes
Lot sizebigger than0.11 acalmost no homes15% of homes
Year builtnewer than194820% of homes38% of homes

About 20 Porter St

How much is 20 Porter St, Shirley, MA worth?

The TopHap Estimate for 20 Porter St, Shirley, MA is $513,160 as of Aug 30, 2026. The likely range is $487,418 to $538,902. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Porter St, Shirley, MA last sell?

20 Porter St, Shirley, MA last sold on Apr 4, 1994 for $108,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 20 Porter St, Shirley, MA?

20 Porter St, Shirley, MA has 2 bedrooms, 1 bathrooms, 875 square feet of living space and a 0.11-acre lot.

When was 20 Porter St, Shirley, MA built?

20 Porter St, Shirley, MA was built in 1948, making it 78 years old. It is a cape cod home. The building has 1 story.

What schools serve 20 Porter St, Shirley, MA?

20 Porter St, Shirley, MA is assigned to Lura A White Elementary School (elementary), rated B-; Ayer Shirley Regional Middle School (middle), rated B; Ayer Shirley Regional High School (high), rated B. All sit in Ayer-Shirley School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Porter St, Shirley, MA compare to other homes in Shirley 01464?

Among the 2,116 homes in Shirley 01464, it is worth more than 51% of them ($513,160 against a typical $508,592), its price per square foot is higher than almost all of them ($586 against a typical $266), it is bigger than 2% of them (875 ft² against a typical 1,939 ft²), its lot is bigger than almost none of them (0.11 ac against a typical 0.92 ac) and it is newer than 20% of them (1948 against a typical 1985). Measured against all of Middlesex County, it is worth more than 16% 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 Porter St, Shirley, MA?

The 2025 property tax bill for 20 Porter St, Shirley, MA was $4,446. The county assessed it at $342,800.

More homes on Porter St

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Assigned schools

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