Skip to main content

MLS ID KEY1042512Last updated Oct 7, 2026

Single Family

129 Jefferson Avenue

Pending · Smithtown · Suffolk County, NY 11780

Bedrooms
4 Beds
Bathrooms
3 Baths
Year built
1967
Est. monthly taxes
$1,841.09
Property gallery0 / 48
Loading photo…Photo unavailable

About this home

Welcome to this stunning 4-bedroom, 2.5-bath Colonial, thoughtfully transformed from a Splanch in 2009. Set on a private, meticulously landscaped 1-acre property, this exceptional home offers a perfect blend of classic elegance, modern updates, and resort-style outdoor living. A stone-edged driveway and walkway create a beautiful first impression. Step through the front door into an inviting open foyer, where natural light, rich hardwood floors, and elegant design create an immediate sense of warmth and sophistication. High-hat lighting throughout the home enhances the bright, welcoming atmosphere. The heart of the home is the custom-designed kitchen, featuring quartz countertops and stainless-steel appliances. Conveniently located just off the kitchen are a half bath, laundry area, and an exit leading directly to the spectacular outdoor oasis. The raised formal living room overlooks the den and features a wood-burning fireplace with a removable electric insert, creating a warm and inviting space for relaxing or entertaining. Upstairs, the spacious primary bedroom has been thoughtfully updated and features a luxurious en-suite bathroom, a generous walk-in closet, radiant-heated flooring, and pull-down attic stairs providing convenient storage. The additional three bedrooms offer ample storage, including double closets in each room. Two of the top-floor bedrooms feature beautiful cathedral ceilings. The upstairs hallway includes a walk-in closet and an additional linen closet, providing exceptional storage throughout the home. An updated hall bathroom features quartz countertops, a double vanity, and radiant-heated flooring, combining style and comfort. The fully finished partial basement offers additional living or recreational space, along with enclosed closets for the burner and water tank. During the 2009 renovation, the home was converted to gas-fired hot-water heat. The backyard is truly an entertainer’s and swimmer’s dream, highlighted by a 25-yard official short-course, heated, in-ground saltwater pool, perfect for swimming, relaxing, entertaining, or enjoying your own private resort-like retreat. The beautifully landscaped grounds feature a 13-zone irrigation system and are backed by a private quarter-acre wooded area, creating a peaceful and secluded setting. This exceptional property offers space, style, privacy, abundant storage, and beautifully maintained grounds, along with thoughtful updates throughout. A rare opportunity to enjoy Colonial charm, modern amenities, and an extraordinary outdoor lifestyle all in one.

Listing snapshot

Days on site
48 days
Listed on MLS
Sep 10, 2026
Full baths
2
Half baths
1
Annual property tax (MLS)
$22,093.08
Tax year
2026
Area source (MLS)
Appraiser
Listing brokerage
Howard Hanna Coach
MLS ID
KEY1042512
Last updated
Oct 7, 2026

General features

Property type
Single Family
Property subtype
Single Family Residence
Year built
1967
Garage
Yes
Garage spaces
1
Parking
Attached
Water source
Public
Sewer
Cesspool
Utilities
Cable Available, Electricity Connected, Natural Gas Connected, Water Connected

Interior features

Basement
Partial
Heating
Baseboard, Hot Water, Natural Gas, Radiant, Radiant Floor
Cooling
Central Air
Interior
Cathedral Ceiling(s), Double Vanity, Eat-in Kitchen, Entrance Foyer, Formal Dining, Primary Bathroom, Quartz/Quartzite Counters, Recessed Lighting, Walk-In Closet(s)
Appliances
Dishwasher, Dryer, Microwave, Refrigerator, Stainless Steel Appliance(s), Washer
Flooring
Ceramic Tile, Hardwood
Fireplace
Yes
Fireplaces
1

Exterior features

Architectural style
Colonial
Construction materials
Frame, Stone, Vinyl Siding
Private pool
Yes

Schools (MLS)

Elementary school
Dogwood Elementary School
Elementary school district
Smithtown
Middle school
Nesaquake Middle School
Middle school district
Smithtown
High school
Smithtown High School-East
High school district
Smithtown

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

Recent activity

  1. Listing updated from MLS
  2. MLS status changed
  3. First seen on this site

Location

Smithtown · Suffolk County, NY 11780Show interactive map
129 Jefferson Avenue

Smithtown · Suffolk County, NY 11780

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.