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Single Family ResidenceResidential
$700,027$332 / 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 91How 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 $463,700 on Jul 19, 2017

403 MOUNTAIN RIDGE DR

MOUNT SINAI, NY 11766
3
Beds
2
Baths
2,110 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.
2,614 ft²
Lot SizeThe size of the land the home sits on, from county records.
1989
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$700K
$639K low$761K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$463,700 · Jul 19, 2017

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$16,082 (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.$4,030 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$200
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$3,830
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$839,584

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.0.06
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
FireplaceWhether the home has a fireplace, and what kind.Yes
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(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.

H
Mount Sinai High SchoolA
High · Grades 9–12 · 0.3 mi
M
Mount Sinai Middle SchoolA
Middle · Grades 5–8 · 0.4 mi
E
Mount Sinai Elementary SchoolA-
Elementary · Grades KG–4 · 0.6 mi

District: Mount Sinai Union Free School District

Neighborhood · ZIP 11766These 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.106
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.65

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.27%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.2.7%
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.12,676
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,703 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$143,038
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$156,700
Average tempThe average temperature here across a full year.52°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

403 Mountain Ridge Dr 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 65% of homes in Mount Sinai 11766
  • Costs less per square foot than 79% of homes in Suffolk County
  • Bigger than 72% of homes in Suffolk County
  • Has a smaller lot than 96% of homes in Suffolk County
  • Newer than 73% of homes in Suffolk County

What homes are worth in Mount Sinai 11766

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

This home
$444K$1.4M

This home is worth more than 35% of homes in Mount Sinai 11766.

How it measures up in Mount Sinai 11766

The dot is this home. The mark in the middle is the typical home in Mount Sinai 11766.

Estimated value$700,027
CheaperTypical $759,386Pricier

Pricier than 35% of homes nearby

Price per ft²$332
CheaperTypical $358Pricier

Pricier than 30% of homes nearby

Living area2,110 ft²
SmallerTypical 2,144 ft²Bigger

Bigger than 47% of homes nearby

Lot size2,614 ft²
SmallerTypical 0.43 acBigger

Bigger than 16% of homes nearby

Year built1989
OlderTypical 1986Newer

Newer than 60% of homes nearby

How 403 Mountain Ridge Dr ranks against every home in each area.
MeasureThis homeMount Sinai 11766Suffolk County
Estimated valuepricier than$700,02735% of homes51% of homes
Price per ft²pricier than$33230% of homes21% of homes
Living areabigger than2,110 ft²47% of homes72% of homes
Lot sizebigger than2,614 ft²16% of homes4% of homes
Year builtnewer than198960% of homes73% of homes

About 403 Mountain Ridge Dr

How much is 403 Mountain Ridge Dr, Mount Sinai, NY worth?

The TopHap Estimate for 403 Mountain Ridge Dr, Mount Sinai, NY is $700,027 as of Oct 21, 2026. The likely range is $638,727 to $761,327. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 403 Mountain Ridge Dr, Mount Sinai, NY last sell?

403 Mountain Ridge Dr, Mount Sinai, NY last sold on Jul 19, 2017 for $463,700, according to the county's recorded deed.

How big is 403 Mountain Ridge Dr, Mount Sinai, NY?

403 Mountain Ridge Dr, Mount Sinai, NY has 3 bedrooms, 2 bathrooms, 2,110 square feet of living space and a 0.06-acre lot.

When was 403 Mountain Ridge Dr, Mount Sinai, NY built?

403 Mountain Ridge Dr, Mount Sinai, NY was built in 1989, making it 37 years old. The building has 2 stories.

What schools serve 403 Mountain Ridge Dr, Mount Sinai, NY?

403 Mountain Ridge Dr, Mount Sinai, NY is assigned to Mount Sinai High School (high), rated A; Mount Sinai Middle School (middle), rated A; Mount Sinai Elementary School (elementary), rated A-. All sit in Mount Sinai Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 403 Mountain Ridge Dr, Mount Sinai, NY compare to other homes in Mount Sinai 11766?

Among the 4,448 homes in Mount Sinai 11766, it is worth more than 35% of them ($700,027 against a typical $759,386), its price per square foot is higher than 30% of them ($332 against a typical $358), it is bigger than 47% of them (2,110 ft² against a typical 2,144 ft²), its lot is bigger than 16% of them (2,614 ft² against a typical 0.43 ac) and it is newer than 60% of them (1989 against a typical 1986). Measured against all of Suffolk County, it is worth more than 51% 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 403 Mountain Ridge Dr, Mount Sinai, NY?

The 2024 property tax bill for 403 Mountain Ridge Dr, Mount Sinai, NY was $16,082. The county assessed it at $4,030.

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