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Long Island · South Shore

High-stakesreal estate,made clear.

Waterfront, new construction and move-up homes, handled with preparation and calm.

John Walsh seated in a sunlit living room, looking toward the window

Team Lead, The South Shore Team

  • East Islip
  • Islip
  • Bay Shore
  • Brightwaters
  • Islip Terrace
  • Great River
  • Oakdale
  • Sayville
  • Woodbury
  • Syosset
Neighborhood guides

The promise

You are never guessingwhat happens next.

John makes high-stakes South Shore real estate feel clear, controlled and confidently executed. He prepares early, explains clearly and owns the outcome.

Waterfront, new construction and design-forward homes carry more moving parts. Bulkheads, flood zones, permits and timelines all shape value. John walks you through each one before it matters.

How clients feel

  • Informed
  • Protected
  • Prepared
  • Calm
  • Confident

Selling with John

Here isthe plan.

Every sale runs on a written plan with clear dates. You always know the next step, who owns it and when it happens.

The full selling plan
  1. Before anything is listed

    We prepare.

    John walks the home with you, pulls the sales that actually compare and reviews permits, survey, bulkhead and flood paperwork. The price comes with reasons you can follow.

    • Comparable sales, street by street
    • Permits and certificates checked
    • Pricing strategy in writing
  2. Launch week

    We respond.

    Photography, video and SERHANT. marketing go live together. Showings are scheduled tight, feedback comes back the same day and John calls you every evening with where things stand.

    • Full marketing launch
    • Showing feedback within the day
    • An evening call from John
  3. When offers arrive

    We negotiate.

    Every offer is laid out side by side: price, financing strength, contingencies and timing. You choose with the full picture, and John negotiates from there.

    • Offers compared on one page
    • Financing and terms reviewed
    • Counteroffers handled calmly
  4. Contract to closing

    We execute.

    Inspections, appraisal, attorney review, title and the walkthrough. John tracks every date and every open item, so nothing slips and nothing surprises you.

    • Every deadline tracked
    • Inspection and appraisal managed
    • A clear path to the closing table

Built for

Preparationmatters onthe water.

Floating walnut stair treads with a glass rail in a home on Timberpoint Road

Finish work at 18 Timberpoint Road, sold by John.

Waterfront

Bulkhead condition, canal depth and flood zone shape what a waterfront home is worth. John walks every buyer and seller through all three before a price is set or an offer goes in.

Waterfront homes

New construction

From dirt to design to marketing, John understands the whole build. He reads plans, permits and finish schedules, so builders and buyers get straight answers.

Selling a new build

Move-up and buy-sell

Selling one home and buying the next at the same time takes timing and nerve. John lines up both sides so you move once, on your schedule.

Start with your home's value

Also: renovated elevated homes, design-forward properties, estate sales and first homes. Every client gets the same discipline and clarity.

John Walsh smiling in a bright white kitchen with an open floor plan behind him

About John

Coaching on Saturday.Closing on Monday.

John has lived on Long Island his whole life. He is a husband, a dad to two boys, Brady and Aiden, and a youth football coach. He works in real estate because he values responsibility, and fatherhood made that instinct stronger.

Before real estate, John worked in finance. That background shows up in every negotiation and every pricing conversation. Today he leads The South Shore Team at SERHANT., where he holds his agents to the same standard he holds himself.

In real estate
10 years
Before that
Finance
Recognized
Top 20 Under 40, Rising Stars in Real Estate, Long Island Board of Realtors
Invited speaker
Zillow Premier Agent Summit, Huntington

Measured by

  • Accountability
  • Preparation
  • Responsiveness
  • Clarity
  • Loyalty
  • Discipline
  • Real human care
The Great South Bay at dusk seen from the marsh edge
Placeholder image

The motto

We prepare.We respond.We execute.

Luxury is preparation, detail and execution. Never flash. Always substance.

Selected sales

Recently sold.

  • Sold

    $3,350,000

    15 Buckingham Court

    Beds / baths
    5 / 5.5
    Sq ft
    5,500
  • Sold

    $2,475,000

    41 Huntting Lane

    Beds / baths
    5 / 4.5
    Sq ft
    N/A
  • Sold

    $2,265,000

    5 Sheep Pasture Lane

    Beds / baths
    4 / 3.5
    Sq ft
    5,200
  • Sold

    $2,150,000

    110 Percy Williams Drive

    Beds / baths
    5 / 5
    Sq ft
    N/A
  • Floating walnut stair treads with a glass rail in a home on Timberpoint Road

    Sold

    18 Timberpoint Road

    Price
    $1,685,000
    Beds / baths
    4 / 2.5
    Sq ft
    3,504
  • Sold

    $1,575,000

    3A Lavender Lane

    Beds / baths
    5 / 3.5
    Sq ft
    4,000
  • Past and present

    More sales, and what is listed now.

    The full record of John's past sales, plus every home he has on the market today.

    John's listings (opens in a new tab)

Sales as listed on John's serhant.com (opens in a new tab) profile. Square footage is approximate.

Buying

Looking fora home?

Browse homes for sale across Long Island, or see what John has on the market right now. When one stands out, he will tell you what the listing leaves out.

Thinking of selling

What is yourhome worth?

A real number from John, built on the sales that actually compare. No automated estimate.

Contact

Talk with John.

Tell John what you're working on. A quick question is fine. He answers calls, texts and emails himself.

145 W Main Street, East Islip, NY 11730