New Castle Real Estate

Welcome to New Castle, New Hampshire—a hidden gem nestled in the picturesque Rockingham County. This charming seaside town, situated on a small island, boasts stunning views of the Atlantic Ocean and is steeped in rich history and natural beauty. With a population of just over 1,000 residents, New Castle offers a close-knit community feel while providing access to the vibrant culture and amenities of nearby Portsmouth.

One of the most captivating features of New Castle is its stunning coastline. Residents and visitors alike can enjoy the serene beaches, scenic parks, and breathtaking waterfronts. The historic Fort Constitution, a former military fortification, offers a glimpse into the area’s past while providing panoramic views of the harbor. Whether you’re strolling along the charming streets lined with colonial-style homes or exploring the natural beauty of the nearby Great Island Common, New Castle is a haven for outdoor enthusiasts.

The town also boasts a rich cultural scene, with local art galleries, quaint shops, and delightful eateries that serve up fresh seafood and other local delicacies. The annual events and festivals foster a sense of community, making it easy to connect with neighbors and friends.

For those seeking a tranquil lifestyle with the charm of a coastal town, New Castle is an ideal choice. With its stunning landscapes, rich history, and vibrant community spirit, it’s no wonder why so many people are drawn to this enchanting seaside retreat. Come and discover the allure of New Castle, where every day feels like a vacation!

Newest Listings in New Castle

$2,400,000

3 Beds ⋅ 3 Baths ⋅ 5112106 MLS

Set in a coveted New Castle neighborhood, this low-maintenance single-family home offers an exceptional blend of quality, style, and coastal living. Enter the Foyer, which seamlessly connects to the sun-filled, open concept kitchen, dining and living area. The interior living spaces feature a beautiful, recently renovated kitchen appointed with Italian appliances, natural marble countertops, and a generously sized island. An adjacent patio sets the stage for al fresco dining. The expansive dining area flows into the living room, which features built-ins, a gas fireplace and a vaulted ceiling. There is direct acces from the living area to the deck which makes an ideal entertaining home. Hardwood floors run throughout the main level. The first-floor primary suite features a walk-in closet, an additional closet, and a spacious bath with an oversized tiled shower. A mudroom with laundry connects to the two-car garage, and a discreetly located powder room completes the main level. Upstairs, two generously sized bedrooms share a full bath, complemented by a versatile office or den area, ideal for working from home or a quiet retreat. The finished lower level offers flexible space for a media room or home gym, plus an additional unfinished area for storage. Association amenities include a private beach, tennis courts, an in-ground pool, and clubhouse, all included in the HOA fee. Enjoy walking-distance access to fine dining at the Wentworth by the Sea Hotel and the other restaurants along the marina, with downtown Portsmouth just minutes away. An exceptional opportunity to enjoy New Castle's sought-after coastal lifestyle, with its charming seaside setting, low property taxes, and outstanding amenities. Photos to come on line October 2nd.

50 N Gate Rd, New Castle

$3,950,000

3 Beds ⋅ 4 Baths ⋅ 5107161 MLS

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 Ave, New Castle

Start Your Search

board logo 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, noncommercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Data last updated .