WaterfrontNew Listing

350 portsmouth avenue

New Castle, NH 03854

$4,200,000

2 BEDS 5 BATHS
3,238 SQFT0.25 AC LOT
Residential
WaterfrontNew Listing
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Bedrooms 2
Total Baths 5
Full Baths 1
Square Feet 3238
Acreage 0.25
Status Active
MLS # 5107161
County NH-Rockingham
More Info
Category Residential
Status Active
Square Feet 3238
Acreage 0.25
MLS # 5107161
County NH-Rockingham
Listed By: Listing Agent Janet Sylvester
Great Island Realty LLC
Welcome to 350 Portsmouth Avenue, an exceptional waterfront residence offering a front row seat to one of the most captivating maritime settings on the New Hampshire Seacoast. With expansive water views of the Piscataqua River and Back Channel, this remarkable property captures everything that makes New Castle waterfront living so special. From magnificent ships and iconic Portsmouth tugboats to sailboats, fishing vessels and pleasure craft, the ever changing boat traffic provides a spectacular backdrop from morning until night. A private deep water dock makes this a dream for boating enthusiasts, offering direct access to Portsmouth Harbor, the Piscataqua River and the open Atlantic. Adding to the property's unique appeal is deeded access to the Back Channel, creating a wonderful launching point for kayaks and paddleboards. Designed to embrace this extraordinary setting, the home features multiple waterfront decks for entertaining, outdoor dining or simply watching the river come alive. A walk-out lower level extends the living space outdoors, while the hot tub and sauna create a private waterfront retreat to enjoy throughout the seasons. Enjoy all the amenities that make New Castle one of the Seacoast's most coveted communities, the nearby yacht clubs, Wentworth Marina, Wentworth by the Sea Country Club, Great Island Common, beaches and the historic charm of island living, all just minutes from downtown Portsmouth. And with New Castle's exceptionally low property taxes, this is a rare opportunity to combine an extraordinary waterfront lifestyle with one of New Hampshire's most desirable communities. Deep water boating out your front door. Kayaking and paddleboarding from your deeded Back Channel access. Incredible water views, spectacular boat traffic, waterfront decks, hot tub and sauna, all in the heart of New Castle. 350 Portsmouth Avenue isn't simply a waterfront home, it's a lifestyle defined by the water.

Exterior Features

  • Style Contemporary
  • Construction Single Family
  • Siding Wood Frame, Wood Siding
  • Exterior Boat Mooring, Boat Slip, Hot Tub, Private Dock, Sauna
  • Roof Asphalt Shingle
  • Garage Yes
  • Garage Description Auto Open, Direct Access, Driveway, Attached
  • Water Public
  • Sewer Public
  • Lot Description Landscaped, Near Country Club, Near Golf Course, Near Shopping, Near School(s)

Interior Features

  • Appliances Electric Cooktop, Dishwasher, Double Oven, Wall Oven, Refrigerator
  • Heating Oil, Forced Air
  • Cooling Central Air
  • Basement Climate Controlled, Daylight, Full, Partially Finished, Interior Stairs, Walk-Out Access
  • Living Area 3,238 SQFT
  • Year Built 1977
  • Stories Two

Neighborhood & Schools

  • School Disrict New Castle
  • Elementary School Maude H. Trefethen School
  • Middle School Rye Junior High School
  • High School Portsmouth

Financial Information

  • Zoning RD RE

Listing Information

Listing Provided Courtesy of Great Island Realty LLC
Copyright 2026 PrimeMLS, Inc. All rights reserved. This information is deemed reliable, but not guaranteed. The data relating to real estate displayed on this display comes in part from the IDX Program of PrimeMLS. The information being provided is for consumers’ personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Data last updated 09/03/2026.
Listing data is current as of 09/03/2026.

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