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MLS ID KEY1041938Last updated Oct 24, 2026

Single Family

18 Walnut Avenue

Active · Brookhaven · Suffolk County, NY 11733

Bedrooms
3 Beds
Bathrooms
2 Baths
Year built
1937
Est. monthly taxes
$1,170.08
Property gallery0 / 32
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About this home

Also offered for lease at $4700/mo. The very best of North Shore living - just up the block from your private Village beach on Port Jefferson Harbor, with lounging areas and mooring rights - introducing 18 Walnut, in the idyllic, harborside community that is the Incorporated Village of Poquott. Warmth abound, this home has elements of craftsman, bungalow, and saltbox design, inside and out, with genuine curb appeal and a footprint spanning approximately 2,250 sq ft that stands apart from the cookie-cutter norm - a coastal charmer with upgrades already in place and room to make it your own. Enter through a vaulted front lounge room, wrapped in windows with 9' ceilings, that flows wonderfully into a generous living room, featuring an original stone fireplace. An oversized entry transitions into a formal dining room, with a bay window, that makes for great entertaining space. The two-tone cottage kitchen offers a 2023 gas range, 2025 dishwasher, breakfast bar, upgraded bay window, and slider to the yard, with real upside for those looking to further expand. Just off the kitchen, a cozy den features more vaulted ceilings and 2 new skylights, while antique details bring character to a spacious first floor full bath with walk-in shower and laundry. Upstairs, the primary bedroom spans the width of the house, with 11' ceilings, dual shallow walk-in closets outfitted with systems, a full wall of finished eave storage, and potential to add an ensuite. An upgraded full bath, 2 additional bedrooms, a generous linen closet, and attic access complete the second floor. The lower level, refinished in 2025, offers an above-grade walkout room (to the front) with 3 windows - ideal as a den or study - plus access to additional unfinished storage and a finished exterior "shed" built into the residence. Significant structure and system upgrades include new skylights (2025), a partial new roof, mostly-upgraded Andersen windows, 2015 Lennox central air and heat, 2011 vinyl cedar impression siding with Azek trim and roof, extensive sheetrock and insulation work, a 2018 hot water heater, upgraded 200-amp electrical service, floor plan changes, and more. First floor hardwood floors refinished and gleaming as of Oct 3, and professional painting is underway. The backyard is secret-garden style - enveloped in greenery, flowering trees and plantings, with a natural stone pathway and patio, a deck strung with bistro lighting, and an outdoor shower - while the front offers a gravel driveway, planting beds, a paver walkway and patio, and ample parking. Village of Poquott residents are afforded access to three private beaches on Port Jeff & Setauket Harbors, with exclusive mooring rights, lounge areas, and kayak/dinghy racks, a Village dock, a boat ramp, a newly updated tennis court, multiple parks and playgrounds, gardens, private security and code enforcement, and an active annual social calendar. Zoned for the Three Village School District (Setauket Elementary, Gelinas Junior High, Ward Melville High School), 18 Walnut is a three-minute drive to Port Jefferson Village's harborside downtown and ferry access to New England, and about 12 minutes to the world renowned institutions that are Stony Brook University & Hospital. Also offered for lease annually, at $5200/mo. True taxes total to $14,041, which includes Village of Poquott taxes of $1,195. Some photos have been virtually staged but all remain true to layout/structure.

Listing snapshot

Days on site
51 days
Listed on MLS
Sep 2, 2026
Full baths
2
Half baths
0
Annual property tax (MLS)
$14,041
Tax year
2026
Area source (MLS)
Other
Listing brokerage
Douglas Elliman Real Estate
MLS ID
KEY1041938
Last updated
Oct 24, 2026

General features

Property type
Single Family
Property subtype
Single Family Residence
Year built
1937
Garage
No
Parking
Driveway
Water source
Public
Sewer
Cesspool
Utilities
Electricity Connected, Water Connected

Interior features

Basement
Finished, Full, Partially Finished, See Remarks, Storage Space, Walk-Out Access
Heating
Hot Air, Oil, Other
Cooling
Central Air
Interior
First Floor Full Bath, Breakfast Bar, Cathedral Ceiling(s), Crown Molding, Eat-in Kitchen, Entrance Foyer, Formal Dining, High Ceilings, His and Hers Closets, Open Floorplan, Original Details, Other, Pantry, Recessed Lighting, Storage
Appliances
Dishwasher, Dryer, Gas Range, Microwave, Refrigerator, Stainless Steel Appliance(s), Washer
Flooring
Hardwood
Fireplace
Yes
Fireplaces
1

Exterior features

Architectural style
Colonial, Craftsman, Other, Saltbox, Traditional
Construction materials
Frame, Vinyl Siding
Exterior
Dock, Fire Pit, Garden, Mooring, Other, Playground, Tennis Court(s)
Private pool
No

Schools (MLS)

Elementary school
Setauket Elementary School
Elementary school district
Three Village
Middle school
Paul J Gelinas Junior High School
Middle school district
Three Village
High school
Ward Melville Senior High School
High school district
Three Village

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 $899,000
  3. First seen on this site
  4. MLS status changed

Location

Brookhaven · Suffolk County, NY 11733Show interactive map
18 Walnut Avenue

Brookhaven · Suffolk County, NY 11733

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.