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MLS ID KEY1025506Last updated Oct 25, 2026

Single Family

31 Underhill Avenue

Active · Oyster Bay · Nassau County, NY 11791

Bedrooms
5 Beds
Bathrooms
4 Baths
Year built
2026
Est. monthly taxes
$0
Property gallery0 / 33
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About this home

New luxury construction in Syosset. Experience exceptional craftsmanship and modern luxury in this stunning new construction home, thoughtfully designed with today’s lifestyle in mind. Offering five spacious bedrooms and four full bathrooms. This home seamlessly blends elegant finishes with functional living space. The main level features a desirable first floor bedroom and full bath, ideal for guests, extended family, or private home office. The heart of the home is a chef inspired gourmet kitchen beautifully appointed with top-of-the-line appliances, custom cabinetry, designer lighting and an open layout perfect for entertaining. The sun filled living and dining area flow effortlessly together with convenient access to the attached garage Upstairs retreat to the luxurious primary suite featuring a spacious walk-in closet and a spa like bath, complete with a soaking tub, oversized walk-in shower and premium finishes. A junior en-suite offers its own private full bath with a walk-in shower while two additional generously sized bedrooms share a beautiful appointed full bath. A conveniently located second floor laundry room completes the upper level. Every detail has been carefully selected from the designer lighting and elegant fixtures to the high-quality craftsmanship found throughout. Simply unpack, add your personal style and enjoy effortless luxury. Perfectly situated within the Syosset school district this exceptional home is just minutes from major highways, the Syosset library, parks, shopping, dining and everything the community has to offer. A rare opportunity to own a brand new luxury home in one of Long Island’s most sought after neighborhoods. This is truly one you don’t want to miss!

Listing snapshot

Days on site
59 days
Listed on MLS
Jul 16, 2026
Full baths
4
Half baths
0
Annual property tax (MLS)
$0
Tax year
2026
Area source (MLS)
Plans
Listing brokerage
Signature Premier Properties
MLS ID
KEY1025506
Last updated
Oct 25, 2026

General features

Property type
Single Family
Property subtype
Single Family Residence
Year built
2026
Garage
Yes
Garage spaces
1
Parking
Driveway, Electric Vehicle Charging Station(s)
Water source
Public
Sewer
Public Sewer
Utilities
Electricity Connected, Natural Gas Connected, Sewer Connected, Water Connected

Interior features

Basement
Full
Heating
Natural Gas
Cooling
Central Air
Interior
Chefs Kitchen, Crown Molding, Double Vanity, Granite Counters, Kitchen Island, Open Floorplan, Primary Bathroom, Recessed Lighting
Appliances
Dishwasher, Dryer, Refrigerator, Stainless Steel Appliance(s), Tankless Water Heater, Washer
Flooring
Hardwood, Tile
Fireplace
No

Exterior features

Architectural style
Colonial
Construction materials
Frame
Private pool
No

Schools (MLS)

Elementary school
Willits Elementary School
Elementary school district
Syosset
Middle school
H B Thompson Middle School
Middle school district
Syosset
High school
Syosset Senior High School
High school district
Syosset

School information is provided by the MLS. Confirm attendance eligibility with the school district.

Recent activity

  1. Listing updated from MLS
  2. Price changed to $1,988,000
  3. First seen on this site
  4. MLS status changed

Location

Oyster Bay · Nassau County, NY 11791Show interactive map
31 Underhill Avenue

Oyster Bay · Nassau County, NY 11791

Google Maps directions

Estimate monthly payment

Loan detailsFixed-rate, fully amortizing loan. Edit the assumptions below; no market rate is supplied.
Property expenses (USD)
MLS amounts are prefilled when available and can be edited. Confirm what fees include. Unknown fee frequencies cannot be converted automatically.Property expenses: MLS values where available; missing values stay blank.

Estimated monthly principal & interest—

Monthly property taxNot provided

Monthly association / maintenance feesNot provided

Estimated monthly total of entered costs—

Excludes insurance, mortgage insurance, special assessments and lender fees. MLS taxes may reflect abatements or exemptions and can change.

Listing data is supplied by the MLS and may change without notice.