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Single Family ResidenceResidential
$2,044,798$562 / 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 98How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026
Last sold for $1,200,000 on Dec 20, 2010

21 RIVERSIDE AVE

CONCORD, MA 01742
5
Beds
5 / 1
Baths
3,641 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.
0.3 ac
Lot SizeThe size of the land the home sits on, from county records.
2010
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
10
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$2M
$2M low$2.1M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,200,000 · Dec 20, 2010
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$0
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$0
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.103%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$940,100
TD BANK NA · recorded Dec 17, 2012
2nd MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$780,000
HANSCOM FCU
3rd MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$350,000

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$22,445 (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.$1,692,700 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$398,300
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,294,400
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,671,500

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.69 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.1 percent flood zone

Scores 0–100; higher = greater projected risk.

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
CountyMiddlesex
Lot (acres)The size of the land the home sits on, from county records.0.30
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air
CoolingThe type of cooling or air conditioning in the home.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

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
Thoreau Elementary SchoolB+
Elementary · Grades KG–5 · 0.3 mi
M
Concord Middle SchoolB+
Middle · Grades 6–8 · 1.0 mi
H
Concord Carlisle High SchoolA+
High · Grades 9–12 · 2.3 mi

District: Concord School District

Neighborhood · ZIP 01742These 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.47
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.108
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.94%
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.2.0%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.9%
PopulationHow many people live in this area.18,974
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.737 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$185,796
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$221,000
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%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
Company ownedWhether the owner is a company or trust rather than a person.Yes

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 Riverside 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 more than 95% of homes in Middlesex County
  • Costs more per square foot than 70% of homes in Middlesex County
  • Bigger than 93% of homes in Middlesex County
  • Has a smaller lot than 83% of homes in Concord 01742
  • Newer than 94% of homes in Middlesex County

What homes are worth in Concord 01742

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

This home
$550K$4.4M

This home is worth more than 76% of homes in Concord 01742.

How it measures up in Concord 01742

The dot is this home. The mark in the middle is the typical home in Concord 01742.

Estimated value$2,044,798
CheaperTypical $1,441,948Pricier

Pricier than 76% of homes nearby

Price per ft²$562
CheaperTypical $599Pricier

Pricier than 37% of homes nearby

Living area3,641 ft²
SmallerTypical 2,384 ft²Bigger

Bigger than 81% of homes nearby

Lot size0.3 ac
SmallerTypical 0.69 acBigger

Bigger than 17% of homes nearby

Year built2010
OlderTypical 1966Newer

Newer than 91% of homes nearby

How 21 Riverside Ave ranks against every home in each area.
MeasureThis homeConcord 01742Middlesex County
Estimated valuepricier than$2,044,79876% of homes95% of homes
Price per ft²pricier than$56237% of homes70% of homes
Living areabigger than3,641 ft²81% of homes93% of homes
Lot sizebigger than0.3 ac17% of homes49% of homes
Year builtnewer than201091% of homes94% of homes

About 21 Riverside Ave

How much is 21 Riverside Ave, Concord, MA worth?

The TopHap Estimate for 21 Riverside Ave, Concord, MA is $2,044,798 as of Jul 14, 2026. The likely range is $2,011,651 to $2,077,945. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Riverside Ave, Concord, MA last sell?

21 Riverside Ave, Concord, MA last sold on Dec 20, 2010 for $1,200,000, according to the county's recorded deed.

How big is 21 Riverside Ave, Concord, MA?

21 Riverside Ave, Concord, MA has 5 bedrooms, 5 bathrooms, 3,641 square feet of living space and a 0.30-acre lot.

When was 21 Riverside Ave, Concord, MA built?

21 Riverside Ave, Concord, MA was built in 2010, making it 16 years old. It is a colonial home. The building has 2 stories.

What schools serve 21 Riverside Ave, Concord, MA?

21 Riverside Ave, Concord, MA is assigned to Thoreau Elementary School (elementary), rated B+; Concord Middle School (middle), rated B+; Concord Carlisle High School (high), rated A+. All sit in Concord School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Riverside Ave, Concord, MA compare to other homes in Concord 01742?

Among the 5,735 homes in Concord 01742, it is worth more than 76% of them ($2,044,798 against a typical $1,441,948), its price per square foot is higher than 37% of them ($562 against a typical $599), it is bigger than 81% of them (3,641 ft² against a typical 2,384 ft²), its lot is bigger than 17% of them (0.3 ac against a typical 0.69 ac) and it is newer than 91% of them (2010 against a typical 1966). Measured against all of Middlesex County, it is worth more than 95% 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 Riverside Ave, Concord, MA?

The 2025 property tax bill for 21 Riverside Ave, Concord, MA was $22,445. The county assessed it at $1,692,700.

More homes on Riverside Ave

Closest homes

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Assigned schools

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