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Single Family ResidenceResidential
$561,675$321 / 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 89How 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 $270,000 on Nov 15, 2017

21 KNOTT AVE

SANDWICH, MA 02563
3
Beds
3.5
Baths
1,752 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.
2024
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
7
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$562K
$499K low$625K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$270,000 · Nov 15, 2017

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,779 (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.$546,700 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$350,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$196,300
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$733,685

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.35 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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.minimal

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
CountyBARNSTABLE
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.Hot Water
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(8)

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.

M
Sandwich Middle High SchoolB+
Middle · Grades 7–12 · 3.0 mi
E
Forestdale School
Elementary · Grades PK–2 · 5.1 mi

District: Sandwich School District

Neighborhood · ZIP 02563These 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.48
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.88
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.55

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.86%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.32%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.0%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.5%
PopulationHow many people live in this area.10,903
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.512 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$120,110
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$142,279
Average tempThe average temperature here across a full year.50°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

21 Knott 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 85% of homes in Sandwich 02563
  • Costs less per square foot than 94% of homes in Barnstable County
  • Has a smaller lot than 97% of homes in Barnstable County
  • Among the newest homes in Sandwich 02563

What homes are worth in Sandwich 02563

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

This home
$412K$1.7M

This home is worth more than 15% of homes in Sandwich 02563.

How it measures up in Sandwich 02563

The dot is this home. The mark in the middle is the typical home in Sandwich 02563.

Estimated value$561,675
CheaperTypical $707,516Pricier

Pricier than 15% of homes nearby

Price per ft²$321
CheaperTypical $407Pricier

Pricier than 11% of homes nearby

Living area1,752 ft²
SmallerTypical 1,696 ft²Bigger

Bigger than 52% of homes nearby

Lot size0.11 ac
SmallerTypical 0.48 acBigger

Bigger than 6% of homes nearby

Year built2024
OlderTypical 1983Newer

Newer than almost all homes nearby

How 21 Knott Ave ranks against every home in each area.
MeasureThis homeSandwich 02563Barnstable County
Estimated valuepricier than$561,67515% of homes22% of homes
Price per ft²pricier than$32111% of homes6% of homes
Living areabigger than1,752 ft²52% of homes60% of homes
Lot sizebigger than0.11 ac6% of homes3% of homes
Year builtnewer than2024almost all homesalmost all homes

About 21 Knott Ave

How much is 21 Knott Ave, Sandwich, MA worth?

The TopHap Estimate for 21 Knott Ave, Sandwich, MA is $561,675 as of Oct 21, 2026. The likely range is $498,569 to $624,781. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Knott Ave, Sandwich, MA last sell?

21 Knott Ave, Sandwich, MA last sold on Nov 15, 2017 for $270,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 21 Knott Ave, Sandwich, MA?

21 Knott Ave, Sandwich, MA has 3 bedrooms, 3.5 bathrooms, 1,752 square feet of living space and a 0.11-acre lot.

When was 21 Knott Ave, Sandwich, MA built?

21 Knott Ave, Sandwich, MA was built in 2024, making it 2 years old. It is a colonial home. The building has 2 stories.

What schools serve 21 Knott Ave, Sandwich, MA?

21 Knott Ave, Sandwich, MA is assigned to Sandwich Middle High School (middle), rated B+; Forestdale School (elementary). All sit in Sandwich School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Knott Ave, Sandwich, MA compare to other homes in Sandwich 02563?

Among the 4,719 homes in Sandwich 02563, it is worth more than 15% of them ($561,675 against a typical $707,516), its price per square foot is higher than 11% of them ($321 against a typical $407), it is bigger than 52% of them (1,752 ft² against a typical 1,696 ft²), its lot is bigger than 6% of them (0.11 ac against a typical 0.48 ac) and it is newer than almost all of them (2024 against a typical 1983). Measured against all of Barnstable County, it is worth more than 22% 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 Knott Ave, Sandwich, MA?

The 2025 property tax bill for 21 Knott Ave, Sandwich, MA was $5,779. The county assessed it at $546,700.

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