317 Old Mill Road, Nissequogue, NY 11780

$2,799,000

Welcome to The Hill Valley House, where timeless design and modern luxury come together in perfect harmony. Completed in 2023 with no expense spared, this one-of-a-kind custom estate sits on 2.66 acres of lush, private grounds and offers an extraordinary blend of timeless design and cutting-edge innovation. Step inside… Read More to experience an ambiance of sophistication and comfort, with soaring 10' ceilings throughout, high-end custom treatments, and impeccable finishes. The grand great room is anchored by a stunning dual-sided gas stone fireplace and flows seamlessly into the heart of the home—a spectacular, state-of-the-art gourmet kitchen. Designed for both beauty and function, this culinary showpiece features rich custom wood cabinetry, sleek quartzite countertops with a dramatic waterfall edge, and a large center island with ample seating—perfect for casual dining or elegant entertaining. The kitchen is fully outfitted with top-tier stainless steel appliances, including a professional-grade six-burner gas stove, wine fridge, and an inviting dinette area that overlooks the tranquil backyard. The first-floor primary suite is a true sanctuary, boasting walls of glass that invite nature in and a spa-inspired ensuite with exquisite tilework, a soaking tub, walk-in shower, custom wood double vanity, and a spacious walk-in closet. A private first-floor office adds convenience and flexibility. Upstairs, three additional bedrooms each feature their own ensuite baths, including one with a private rooftop deck. A second-floor entertainment area with built in speakers and walk-in storage room or office complete the upper level. One of the crown jewels of The Hill Valley House is the screened-in porch—a luxurious outdoor haven designed for year-round enjoyment. Featuring double French doors, a dramatic dual stone gas fireplace, built-in infrared heaters, and a refined dining area, this exceptional space merges indoor elegance with outdoor serenity. The finished basement includes a dedicated home gym and a vast unfinished area with endless potential—ideal for a media room, wine cellar, or additional living space tailored to your lifestyle. Adding to the home’s long list of luxuries are a state-of-the-art solar panel system, whole-house water purification, advanced backup power system, smart home technologies, as well as an oversized three-car garage. Outside, your personal resort awaits—with a heated 19'x36' saltwater in-ground pool, cozy fire pit, and expansive patios—perfect for entertaining or peaceful relaxation. The Hill Valley House offers a lifestyle that feels like a permanent vacation—set on lush, resort-like grounds, yet just minutes from Long Island Sound beaches, local marinas, restaurants, charming town shops, and Stony Brook University. Truly, no detail was overlooked in the creation of this exceptional home. From its superior construction to its thoughtfully curated finishes, this is more than a home—it’s a lifestyle. Make this dream property yours today. Read Less

Listing Courtesy of Daniel Gale Sothebys Intl Rlty, 631-584-6600

Listing Snapshot

Days Online

Last Updated

Jul 15, 2025

Property Type

Single Family Residence

Beds

Full Baths

Partial Baths

Square Ft.

4,250

Year Built

2023

MLS Number

878416

30 Days Snapshot Of 11780

$1.07M

+26%

(avg) sold price

+27%

homes sold

111

-22%

(avg) days on market

Snapshot

Area Map

Additional Details

Appliances & Equipment

Description: "Convection Oven", "Dishwasher", "Dryer", "Electric Oven", "Electric Water Heater", "ENERGY STAR Qualified Appliances", "Exhaust Fan", "Gas Range", "Humidifier", "Microwave", "Refrigerator", "Stainless Steel Appliance(s)", "Washer", "Water Purifier Owned", "Wine Refrigerator"

Basement

Description: "Full", "Partially Finished", "Storage Space"

Building

Area: 4250, Architecture: "Colonial", "Farmhouse", Building Area: 5203, Construction Materials: "Advanced Framing Technique", "Cedar", "Frame", "HardiPlank Type", Levels: "Three Or More", Year Built: 2023

Cooling

Details: "Central Air"

Exterior Features

Features: "Balcony", "Fire Pit", "Mailbox", "Rain Gutters", Patio Features: "Covered", "Patio", "Porch", "Screened"

Fence

Description: "Back Yard", "Partial"

Fireplaces

Total Fireplaces: 1

Floors

Flooring: "Ceramic Tile", "Hardwood"

Garage

Garage Spaces: 3

Heating

Heating: "Electric", "ENERGY STAR Qualified Equipment", "Forced Air", "Heat Pump", "Propane", "Solar"

Laundry

Description: "Electric Dryer Hookup", "Inside", "Laundry Room", "Washer Hookup"

Lot

Features: "Back Yard", "Front Yard", "Landscaped", "Level", "Part Wooded", "Private", "Sprinklers In Front", Acres: 2.66

Property

Description: "Fuel Tank(s)", "Pool Equip/Cover"

Pool

Features: "Fenced", "In Ground", "Outdoor Pool", "Pool Cover", "Salt Water", "Vinyl", Private Pool

Utilities

Sewer: "Septic Tank", Water Source: "Public", Utilities: "Cable Available", "Electricity Available", "Propane", "Trash Collection Public", "Water Available"

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