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Single Family ResidenceResidential
$2,287,182$1,108 / 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 82How 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 $460,000 on Aug 4, 2000

121 NORTHSIDE DR

SAG HARBOR, NY 11963
4
Beds
3
Baths
2,064 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.
0.94 ac
Lot SizeThe size of the land the home sits on, from county records.
1996
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$2.3M
$1.9M low$2.7M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$460,000 · Aug 4, 2000

Tax & Assessment

Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$909,100 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$516,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$393,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,443,016

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.Mobile Home
CountySUFFOLK
Lot (acres)The size of the land the home sits on, from county records.0.94
HeatingThe type of heating system in the home.Yes
CoolingThe type of cooling or air conditioning in the home.Central
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.Yes
ViewThe type of view from the property, or another feature of the site that affects value.Inferior
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 1,112 ft²

Transaction History(1)

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
Pierson Middle/High SchoolA-
Middle · Grades 6–12 · 4.7 mi
E
Sag Harbor Elementary SchoolB+
Elementary · Grades PK–5 · 4.8 mi

District: Sag Harbor Union Free School District

Neighborhood · ZIP 11963These 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.174
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.100
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.47

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.65%
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.5.0%
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.6,509
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.416 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$116,382
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$180,267
Average tempThe average temperature here across a full year.51°F
Annual precipHow much rain and melted snow falls here in a typical year.48 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

121 Northside 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 more than 94% of homes in Suffolk County
  • Costs more per square foot than 95% of homes in Suffolk County
  • Bigger than 70% of homes in Suffolk County
  • Has a bigger lot than 89% of homes in Suffolk County
  • Newer than 83% of homes in Suffolk County

What homes are worth in Sag Harbor 11963

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

This home
$813K$9M

This home is worth more than 51% of homes in Sag Harbor 11963.

How it measures up in Sag Harbor 11963

The dot is this home. The mark in the middle is the typical home in Sag Harbor 11963.

Estimated value$2,287,182
CheaperTypical $2,226,068Pricier

Pricier than 51% of homes nearby

Price per ft²$1108
CheaperTypical $1143Pricier

Pricier than 46% of homes nearby

Living area2,064 ft²
SmallerTypical 2,030 ft²Bigger

Bigger than 51% of homes nearby

Lot size0.94 ac
SmallerTypical 0.51 acBigger

Bigger than 73% of homes nearby

Year built1996
OlderTypical 1999Newer

Newer than 42% of homes nearby

How 121 Northside Dr ranks against every home in each area.
MeasureThis homeNoyackSag Harbor 11963Suffolk County
Estimated valuepricier than$2,287,18264% of homes51% of homes94% of homes
Price per ft²pricier than$110858% of homes46% of homes95% of homes
Living areabigger than2,064 ft²59% of homes51% of homes70% of homes
Lot sizebigger than0.94 ac74% of homes73% of homes89% of homes
Year builtnewer than199644% of homes42% of homes83% of homes

About 121 Northside Dr

How much is 121 Northside Dr, Sag Harbor, NY worth?

The TopHap Estimate for 121 Northside Dr, Sag Harbor, NY is $2,287,182 as of Sep 24, 2026. The likely range is $1,873,744 to $2,700,620. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 121 Northside Dr, Sag Harbor, NY last sell?

121 Northside Dr, Sag Harbor, NY last sold on Aug 4, 2000 for $460,000, according to the county's recorded deed.

How big is 121 Northside Dr, Sag Harbor, NY?

121 Northside Dr, Sag Harbor, NY has 4 bedrooms, 3 bathrooms, 2,064 square feet of living space and a 0.94-acre lot.

When was 121 Northside Dr, Sag Harbor, NY built?

121 Northside Dr, Sag Harbor, NY was built in 1996, making it 30 years old. It is a mobile home home. The building has 2 stories.

What schools serve 121 Northside Dr, Sag Harbor, NY?

121 Northside Dr, Sag Harbor, NY is assigned to Pierson Middle/High School (middle), rated A-; Sag Harbor Elementary School (elementary), rated B+. All sit in Sag Harbor Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 121 Northside Dr, Sag Harbor, NY compare to other homes in Sag Harbor 11963?

Among the 4,375 homes in Sag Harbor 11963, it is worth more than 51% of them ($2,287,182 against a typical $2,226,068), its price per square foot is higher than 46% of them ($1108 against a typical $1143), it is bigger than 51% of them (2,064 ft² against a typical 2,030 ft²), its lot is bigger than 73% of them (0.94 ac against a typical 0.51 ac) and it is newer than 42% of them (1996 against a typical 1999). Measured against all of Suffolk County, it is worth more than 94% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

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Assigned schools

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