350 Portsmouth Avenue, New Castle, NH

$4,200,000

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3

Beds

5

Baths

3,238

Square feet

0.25

Acres

About 350 Portsmouth Avenue

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.

Features of 350 Portsmouth Avenue

MLS® # 5107161
Price $4,200,000
Bedrooms 3
Bathrooms 5.00
Full Baths 1
Half Baths 1
Square Footage 3,238
Acres 0.25
Year Built 1977
Type Residential
Sub-Type Residential
Status Active

Community Information

Address 350 Portsmouth Avenue
Area New Castle
City New Castle
County Rockingham
State NH
Zip Code 03854

Amenities

Utilities Cable
Is Waterfront No
Waterfront River
Has Pool No

Interior

Interior Carpet, Tile
Appliances Electric Cooktop, Dishwasher, Double Oven, Wall Oven, Refrigerator
Heating Oil, Forced Air
Cooling Central AC
Fireplace No
# of Stories 2

Exterior

Roof Asphalt Shingle
Waterfront Name Piscataqua River

School Information

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

Additional Information

Date Listed August 28th, 2026
Days on Market 9
Zoning RD RE

Listing Details

AgentJanet Sylvester
OfficeGreat Island Realty LLC

Listing Map

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