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Single Family ResidenceResidential
$1,588,923$724 / 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 Aug 30, 2026
Last sold for $1,098,000 on Jan 4, 2021

17 KNOLLWOOD RD

ROSLYN, NY 11576
3.5
Baths
2,196 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.
0.18 ac
Lot SizeThe size of the land the home sits on, from county records.
1943
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
9
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.6M
$1.4M low$1.7M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,098,000 · Jan 4, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$21,835 (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.$982 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$344
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$638
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,025
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$982,000

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
CountyNASSAU
Lot (acres)The size of the land the home sits on, from county records.0.18
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.Slate
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 60 ft²

Transaction History(2)

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
Roslyn Heights Elementary School
Elementary · Grades KG–11 · 1.4 mi
H
Roslyn High SchoolA
High · Grades 9–12 · 1.5 mi
M
Roslyn Middle SchoolA-
Middle · Grades 6–8 · 2.1 mi

District: Roslyn Union Free School District

Neighborhood · ZIP 11576These 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.78
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.111
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.104

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.34%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.1%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.0%
PopulationHow many people live in this area.13,502
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,896 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$189,117
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$255,113
Average tempThe average temperature here across a full year.53°F
Annual precipHow much rain and melted snow falls here in a typical year.49 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.56%

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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

17 Knollwood Rd 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 89% of homes in Nassau County
  • Costs more per square foot than 93% of homes in Nassau County
  • Smaller than 73% of homes in Roslyn 11576
  • Has a smaller lot than 85% of homes in Roslyn 11576
  • Older than 93% of homes in Roslyn 11576

What homes are worth in Roslyn 11576

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

This home
$877K$4M

This home is worth more than 35% of homes in Roslyn 11576.

How it measures up in Roslyn 11576

The dot is this home. The mark in the middle is the typical home in Roslyn 11576.

Estimated value$1,588,923
CheaperTypical $1,804,420Pricier

Pricier than 35% of homes nearby

Price per ft²$724
CheaperTypical $625Pricier

Pricier than 85% of homes nearby

Living area2,196 ft²
SmallerTypical 2,798 ft²Bigger

Bigger than 27% of homes nearby

Lot size0.18 ac
SmallerTypical 0.35 acBigger

Bigger than 15% of homes nearby

Year built1943
OlderTypical 1965Newer

Newer than 7% of homes nearby

How 17 Knollwood Rd ranks against every home in each area.
MeasureThis homeRoslyn 11576Nassau County
Estimated valuepricier than$1,588,92335% of homes89% of homes
Price per ft²pricier than$72485% of homes93% of homes
Living areabigger than2,196 ft²27% of homes73% of homes
Lot sizebigger than0.18 ac15% of homes70% of homes
Year builtnewer than19437% of homes26% of homes

About 17 Knollwood Rd

How much is 17 Knollwood Rd, Roslyn, NY worth?

The TopHap Estimate for 17 Knollwood Rd, Roslyn, NY is $1,588,923 as of Aug 30, 2026. The likely range is $1,429,693 to $1,748,153. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 17 Knollwood Rd, Roslyn, NY last sell?

17 Knollwood Rd, Roslyn, NY last sold on Jan 4, 2021 for $1,098,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 17 Knollwood Rd, Roslyn, NY?

17 Knollwood Rd, Roslyn, NY has 3.5 bathrooms, 2,196 square feet of living space and a 0.18-acre lot.

When was 17 Knollwood Rd, Roslyn, NY built?

17 Knollwood Rd, Roslyn, NY was built in 1943, making it 83 years old. It is a colonial home. The building has 2 stories.

What schools serve 17 Knollwood Rd, Roslyn, NY?

17 Knollwood Rd, Roslyn, NY is assigned to Roslyn Heights Elementary School (elementary); Roslyn High School (high), rated A; Roslyn Middle School (middle), rated A-. All sit in Roslyn Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 17 Knollwood Rd, Roslyn, NY compare to other homes in Roslyn 11576?

Among the 4,806 homes in Roslyn 11576, it is worth more than 35% of them ($1,588,923 against a typical $1,804,420), its price per square foot is higher than 85% of them ($724 against a typical $625), it is bigger than 27% of them (2,196 ft² against a typical 2,798 ft²), its lot is bigger than 15% of them (0.18 ac against a typical 0.35 ac) and it is newer than 7% of them (1943 against a typical 1965). Measured against all of Nassau County, it is worth more than 89% 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 17 Knollwood Rd, Roslyn, NY?

The 2025 property tax bill for 17 Knollwood Rd, Roslyn, NY was $21,835. The county assessed it at $982.

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