Waterfront
Address
350 Portsmouth Avenue, New Castle, NH
Price
$ 4,200,000
Property Attributes
- MLS#5107161
- TypeSingle Family
- Listing Status Active
- CountyROCKINGHAM
- CityNew Castle
- AreaRockingham
- NeighborhoodPiscataqua River
- Zip03854
- StyleContemporary
- Year Built1977
- Price$ 4,200,000
- Bedrooms3
- Full Bathrooms4
- Half Bathrooms1
- Sqr Footage3238
- Lot Size0.25 Acres
Data Source:
PrimeMLS
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.
| Elementary School | Middle School | High School |
|---|---|---|
| Maude H. Trefethen School Elementary School | Rye Junior High School | Portsmouth High School |
| Price History | |
|---|---|
| 8/28/2026 | Listed $4,200,000 |
General Features
| Road Frontage | Yes |
|---|---|
| Sewer | Public |
| Heating | Oil,Forced Air |
| Cooling | Central AC |
| Utilities | Cable |
| Roof | Asphalt Shingle |
| Appliances | Electric Cooktop,Dishwasher,Double Oven,Wall Oven,Refrigerator |
| Garage | Yes |
| Flood Zone | Land Only |
| Zoning | RD RE |
| 3/4 Baths | 3 |
| Full Baths | 1 |
| Half Baths | 1 |
| Bathrooms | 5 |
| Year Built | 1977 |
| Electric | 200+ Amp Service |
| Style | Contemporary |
| Stories Count | 2 |
| Type | Single Family |
| Property Condition | Existing |
| Assessment Amount | 2900900 |
| Tax Year | 2025 |
| Fuel Company | Nobel Fuel |
| Electric Company | Eversource |
| Covenants | No |
| Construction Materials | Wood Frame,Wood Siding |
| High School | Portsmouth High School |
| City | New Castle |
| Property Class | Residential |
| Other Equipment | Irrigation Meter |
| School District | New Castle |
| Seasonal | No |
| Elementary School | Maude H. Trefethen School |
| Middle School | Rye Junior High School |
| Virtual Tour URL Unbranded 2 | https://youriguide.com/350_portsmouth_ave_new_castle_nh |
| DOM | 11 |
| Price Per Sq Ft Total AG | 1768.42 |
| Last Updated | 09/03/2026 11:15:49 |
Interior Features
| Basement Description | Climate Controlled,Daylight,Full,Interior Stairs,Partially Finished,Walkout |
|---|---|
| Interior Amenities | Cathedral Ceiling,Ceiling Fan,Dining Area,Wood Fireplace,1 Fireplace,Kitchen Island,Primary BR w/ BA,Natural Light |
| Basement | Yes |
| Flooring | Carpet,Tile |
| Beds | 3 |
| Total Rooms | 7 |
| Internet | Cable Internet |
| Total Finished Area | 3238 |
| Basement Access Type | Walkout |
Exterior Features
| Lot Features | Landscaped,Near Country Club,Near Golf Course,Near Shopping,Near School(s) |
|---|---|
| Exterior Amenities | Boat Mooring,Boat Slip/Dock,Hot Tub,Private Dock,Sauna |
| Driveway | Paved |
| Water View | Yes |
| Lot Size Area | 0.25 |
| Water Source | Public |
| Parking Features | Auto Open,Direct Entry,Driveway,Attached |
| Garage Capacity | 2 |
| Water Body Name | Piscataqua River |
| Foundation | Poured Concrete |
| Lot | 10 |
| Color | Gray |
| Waterfront Property | Yes |
| Road Frontage Length | 100 |
| Road Frontage Type | Paved,Public Maintained Road |
| Surveyed | Unknown |
| Water Body Type | River |
| Lot Size Square Feet | 10890 |
| Water Frontage Length | 100 |
| Water Body Access | Yes |
| Water Access Details | Deep Water Access,Dock Access |
Amenities
- Foreclosure
- Views
- Short Sale
- New Construction
- Adult 55+
- Lease To Own
- No HOA Fees
- Furnished
- Primary On Main
- Air Conditioning
- Seller Finance
- Green
- Fixer Upper
- Horse
- Golf
- Fireplace
- Deck
- Garage
- Basement
- Pool
Property vs Single Family Average in 03854
Statistics provided by Inside Real Estate
Price
Year Built
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consumers may be interested in purchasing. Data last updated September 11, 2026 4:44 AM UTC
