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Darren McGovern
REALTOR®
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350 Portsmouth Avenue, New Castle, NH 03854

$4,200,000
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BEDS3 BATHS4 full 1 partial SQUARE FEET3,238 MLS#5107161
STATUSActive PROPERTY TYPEResidential - Single Family SCHOOLNew Castle

Listing Courtesy of: Great Island Realty LLC
Agency Phone: 603-433-3350
Associate Name: Janet Sylvester
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Property Description

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.

350 Portsmouth Avenue | MLS# 5107161

This single family home located at 350 Portsmouth Avenue, New Castle, NH 03854 is currently listed for sale with an asking price of $4,200,000. This property was built in 1977 and has 3 bedrooms and 4 full and 1 partial baths with 3238 sq. ft. Portsmouth Avenue is located within the New Castle school district. Search New Castle real estate on darrenmcgovern.masiellogrouprealestate.com today.

Property Features

Property Type: Residential - Single Family
Basement: Yes
Basement: Climate Controlled, Daylight, Full, Partially Finished, Interior Stairs, Walkout
Cooling: Central AC
Garage: 2 car attached
Heating: Oil, Forced Air
Home Style: Contemporary
Lot Size: 0.25 Acres
Roof Type: Asphalt Shingle
Stories: 2.0
Taxes: $15,636
Year Built: 1977

Amenities

Cathedral Ceiling
Ceiling Fan
Dining Area
Wood Fireplace
1 Fireplace
Kitchen Island
Primary BR w/ BA
Natural Light
Boat Mooring
Boat Slip/Dock
Hot Tub
Private Dock
Sauna

Feature Descriptions

Appliances: Electric Cooktop, Dishwasher, Double Oven, Wall Oven, Refrigerator
Baths 1/2: 1
Baths 3/4: 3
Baths Full: 1
Color: Gray
Construction: Wood Frame, Wood Siding
Days on Site: 12
Driveway: Paved
Electric: 200+ Amp Service
Equipment: Irrigation Meter
Exterior: Wood Frame, Wood Siding
Flood Zone: Land Only
Flooring: Carpet, Tile
Foundation: Poured Concrete
Hot Tub: Yes
Lot: Landscaped, Near Country Club, Near Golf Course, Near Shopping, Near School(s)
Nearby Bodies of Water: Piscataqua River
Number of Rooms: 7
Parking: Auto Open, Direct Entry, Driveway, Attached
Road Frontage: 100
Roads: Paved, Public Maintained Road
Sewer: Public
Sq. Ft. Above Grade Finished: 2375
Sq. Ft. Below Grade Finished: 863
Sq. Ft. Total Finished: 3238
Total Stories: 2
Water: Public
Water Access: Yes
Water Body Type: River
Water Frontage: 100
Water Rights: Exclusively Owned
Water View: Yes
Zoning: RD RE

Local Schools

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

Listed By / Shown By

Listed By

Agency Name: Great Island Realty LLC
Agent Name: Janet Sylvester
Agency Phone: 603-433-3350

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Estimated Payment

$ 11,875.38 per month $9,347.38 Principal & Interest $1,303.00 Property Tax $1,225.00 Homeowner's Insurance

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Disclaimer: All information deemed reliable but not guaranteed. All properties are subject to prior sale, change or withdrawal. Neither listing broker(s) or information provider(s) shall be responsible for any typographical errors, misinformation, misprints and shall be held totally harmless. Listing(s) information is provided 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. Information on this site was last updated 09/09/2026. The listing information on this page last changed on 09/09/2026. The data relating to real estate for sale on this website comes in part from the Internet Data Exchange program of Delta Media Group MLS (last updated Wed 09/09/2026 7:36:04 AM EST) or MLSPIN MLS (last updated Wed 09/09/2026 7:06:20 AM EST) or Prime MLS (last updated Wed 09/09/2026 7:30:57 AM EST) or MREIS (last updated Wed 09/09/2026 7:29:27 AM EST). Real estate listings held by brokerage firms other than Better Homes and Gardens Real Estate The Masiello Group may be marked with the Internet Data Exchange logo and detailed information about those properties will include the name of the listing broker(s) when required by the MLS. All rights reserved.

Listing data compilation and photo(s) 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 2026-09-09 07:30:57

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