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Single Family ResidenceResidential
$664,345$319 / 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 Sep 24, 2026
Last sold for $457,000 on Jul 12, 2021

20 GRENVILLE AVE

PATCHOGUE, NY 11772
4
Beds
2
Baths
2,085 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.
0.17 ac
Lot SizeThe size of the land the home sits on, from county records.
1940
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

$664K
$631K low$697K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$457,000 · Jul 12, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$13,172 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$2,600 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$2,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$541,666

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.84 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.45%
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
CountySUFFOLK
Lot (acres)The size of the land the home sits on, from county records.0.17
HeatingThe type of heating system in the home.Radiant
PoolWhether the property has a pool, and what kind, such as in-ground.No
ViewThe type of view from the property, or another feature of the site that affects value.Waterfront

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.

M
South Ocean Middle SchoolC
Middle · Grades 6–8 · 0.3 mi
E
River Elementary SchoolC-
Elementary · Grades PK–5 · 0.6 mi
H
Patchogue-Medford High SchoolB-
High · Grades 9–12 · 3.9 mi

District: Patchogue-Medford Union Free School District

Neighborhood · ZIP 11772These 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.103
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 100.59

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.19%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.2%
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.44,232
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,172 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$100,427
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$130,441
Average tempThe average temperature here across a full year.52°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.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 Grenville 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 76% of homes in Patchogue 11772
  • Costs less per square foot than 84% of homes in Suffolk County
  • Bigger than 82% of homes in Patchogue 11772
  • Has a smaller lot than 83% of homes in Suffolk County
  • Older than 91% of homes in Suffolk County

What homes are worth in Patchogue 11772

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

This home
$374K$1.1M

This home is worth more than 76% of homes in Patchogue 11772.

How it measures up in Patchogue 11772

The dot is this home. The mark in the middle is the typical home in Patchogue 11772.

Estimated value$664,345
CheaperTypical $588,850Pricier

Pricier than 76% of homes nearby

Price per ft²$319
CheaperTypical $399Pricier

Pricier than 18% of homes nearby

Living area2,085 ft²
SmallerTypical 1,467 ft²Bigger

Bigger than 82% of homes nearby

Lot size0.17 ac
SmallerTypical 0.25 acBigger

Bigger than 20% of homes nearby

Year built1940
OlderTypical 1958Newer

Newer than 27% of homes nearby

How 20 Grenville Ave ranks against every home in each area.
MeasureThis homePatchogue 11772Suffolk County
Estimated valuepricier than$664,34576% of homes44% of homes
Price per ft²pricier than$31918% of homes16% of homes
Living areabigger than2,085 ft²82% of homes71% of homes
Lot sizebigger than0.17 ac20% of homes17% of homes
Year builtnewer than194027% of homes9% of homes

About 20 Grenville Ave

How much is 20 Grenville Ave, Patchogue, NY worth?

The TopHap Estimate for 20 Grenville Ave, Patchogue, NY is $664,345 as of Sep 24, 2026. The likely range is $631,384 to $697,306. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Grenville Ave, Patchogue, NY last sell?

20 Grenville Ave, Patchogue, NY last sold on Jul 12, 2021 for $457,000, according to the county's recorded deed.

How big is 20 Grenville Ave, Patchogue, NY?

20 Grenville Ave, Patchogue, NY has 4 bedrooms, 2 bathrooms, 2,085 square feet of living space and a 0.17-acre lot.

When was 20 Grenville Ave, Patchogue, NY built?

20 Grenville Ave, Patchogue, NY was built in 1940, making it 86 years old. The building has 2 stories.

What schools serve 20 Grenville Ave, Patchogue, NY?

20 Grenville Ave, Patchogue, NY is assigned to South Ocean Middle School (middle), rated C; River Elementary School (elementary), rated C-; Patchogue-Medford High School (high), rated B-. All sit in Patchogue-Medford Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Grenville Ave, Patchogue, NY compare to other homes in Patchogue 11772?

Among the 13,201 homes in Patchogue 11772, it is worth more than 76% of them ($664,345 against a typical $588,850), its price per square foot is higher than 18% of them ($319 against a typical $399), it is bigger than 82% of them (2,085 ft² against a typical 1,467 ft²), its lot is bigger than 20% of them (0.17 ac against a typical 0.25 ac) and it is newer than 27% of them (1940 against a typical 1958). Measured against all of Suffolk County, it is worth more than 44% 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 Grenville Ave, Patchogue, NY?

The 2024 property tax bill for 20 Grenville Ave, Patchogue, NY was $13,172. The county assessed it at $2,600.

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