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317 Old Mill Road

Nissequogue, NY 11780

4 beds
5 baths
4,250 sqft
~3 acre lot
$658 per sqft
2023 build
– on site

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 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 quartz 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.

Listing courtesy of ONEKEY / Daniel Gale Sothebys Intl Rlty

Last checked: Checking… • Last updated Jun 17, 2025 •

MLS# 878416 —

The Building

Year Built:

2023
Basement:

true
Architectural Style:

Colonial, Farmhouse
Construction Materials:

Advanced Framing Technique, Cedar, Frame, HardiPlank Type
Patio And Porch Features:

Covered, Patio, Porch, Screened
Foundation Details:

Concrete Perimeter
Building Area Units:

Square Feet
Building Area Total:

5203
Exterior Features:

Balcony, Fire Pit, Mailbox, Rain Gutters
Window Features:

Double Pane Windows, ENERGY STAR Qualified Windows, Insulated Windows
Security Features:

Security System, Smoke Detector(s), Video Cameras
Laundry Features:

Electric Dryer Hookup, Inside, Laundry Room, Washer Hookup
Attic:

Partial,Pull Stairs
Green Energy Generation:

Solar

Interior

Levels:

Three Or More
Living Area:

4250
Total Rooms:

11
Interior Features:

First Floor Bedroom, First Floor Full Bath, Bidet, Breakfast Bar, Built-in Features, Cathedral Ceiling(s), Ceiling Fan(s), Chefs Kitchen, Double Vanity, Eat-in Kitchen, ENERGY STAR Qualified Door(s), Entrance Foyer, Formal Dining, Granite Counters, High Ceilings, High Speed Internet, Kitchen Island, Low Flow Plumbing Fixtures, Primary Bathroom, Master Downstairs, Open Floorplan, Open Kitchen, Pantry, Quartz/Quartzite Counters, Recessed Lighting, Smart Thermostat, Soaking Tub, Storage, Walk-In Closet(s), Washer/Dryer Hookup, Wet Bar, Wired for Sound
Fireplace Features:

Gas, Living Room
Fireplaces Total:

1
Fireplace:

true
Flooring:

Ceramic Tile, Hardwood
Living Area Source:

Plans
Additional Rooms:

Dining Area,Home Office
# of Kitchens:

1

Financial & Terms

Lease Considered:

false

The Property

Fencing:

Back Yard, Partial
Lot Features:

Back Yard, Front Yard, Landscaped, Level, Part Wooded, Private, Sprinklers In Front
Lot Size Acres:

2.66
Parcel Number:

0802-012-00-01-00-004-004
Property Type:

Residential
Property Subtype:

Single Family Residence
Lot Size SqFt:

115,870 Sqft
Property Attached:

false
Property Condition:

Actual
Additional Parcels:

false
Waterfront:

false
Road Responsibility:

Public Maintained Road
Other Equipment:

Fuel Tank(s), Pool Equip/Cover
Horse:

false

Listing Agent

Contact info:

Taxes

Tax Year:

2025
Tax Source:

Municipality
Tax Annual Amount:

41089.7
Tax Lot:

004.004
Included In Taxes:

Trash

Beds

Total Bedrooms:

4

Baths

Full Baths:

4
Half Baths:

1
Total Baths:

5

The Listing

Special Listing Conditions:

None
Virtual Tour URL Unbranded:

Virtual Tour
Virtual Tour URL Branded:

Virtual Tour

Heating & Cooling

Heating:

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

Central Air
# of Heating Zones:

3

Utilities

Sewer:

Septic Tank
Utilities:

Cable Available, Electricity Available, Propane, Trash Collection Public, Water Available
Water Source:

Public
Electric Company:

Pseg
Solar Ownership:

Owned

Appliances

Appliances:

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

Schools

High School:

Smithtown High School East
Elementary School:

St James Elementary School
High School District:

Smithtown
Middle School:

Nesaquake Middle School

The Community

Association:

false
Senior Community:

false
Pool Features:

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

true

Parking

Parking Features:

Driveway, Garage, Garage Door Opener, Private
Garage:

true
Garage Spaces:

3
Carport:

false

Monthly cost estimate

Asking price

$2,799,000

Expense	Monthly cost
Mortgage	$14,987
Taxes	$3,424
Insurance	$769
Utilities	$255 See report
Total	$19,435/mo.^*
	^*This is an estimate

Explore the Area

My Commute

From

Walk Score®

Provided by WalkScore® Inc.

Bike Score®

Provided by WalkScore® Inc.

Soundscore™

Provided by HowLoud

Air Pollution Index

Provided by ClearlyEnergy

Sale history

Date	Event	Source	Price	% Change
6/16/25 Jun 16, 2025	Listed / Active	ONEKEY	$2,799,000

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This house located in Nissequogue, NY 11780 is currently for sale for $2,799,000. 317 Old Mill Road is a 4,250 square foot house with 4 beds and 5 baths that has been on Estately for 1 days.

Listing Courtesy of: ONEKEY and Daniel Gale Sothebys Intl Rlty.

IDX information is provided exclusively for consumers’ personal non-commercial use. It may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Data is deemed reliable but is not guaranteed accurate by the MLS.

Based on information submitted to the MLS GRID. All data is obtained from various sources and may not have been verified by broker or MLS GRID. Supplied Open House Information is subject to change without notice. All information should be independently reviewed and verified for accuracy. Properties may or may not be listed by the office/agent presenting the information.