New Castle Island Homes for Sale

/43
$3,495,000
- 4 Beds
- 4.5 Baths
- 3,000 Sq Ft
34 Harborview, New Castle, NH 03854

Stunning 4 bedroom Contemporary Cape style home in sought after Wentworth community on New Castle. Located on large, 0.49 private lot tucked at the end of Harborview St. This immaculate home features meticulous landscaping and boasts incredible privacy with fenced in backyard, mature trees and partial water views. Enjoy the many benefits of Wentworth living with access to the pool, community

Jeffrey Mountjoy The Aland Realty Group

34 Harborview, New Castle, NH 03854
/46
$1,649,000
- 4 Beds
- 1.5 Baths
- 1,941 Sq Ft
42 Main St, New Castle, NH 03854

42 Main Street is an updated antique colonial located in the heart of New Castle village. It's within walking distance of the Great Island Cafe and a short stroll to the beach. The property offers views of the Piscataqua River from the patio and inside you'll find stunning wood floors, exposed brick and fireplaces that add to its character and charm. The second floor features two generous

Laura Ludes Madden Group

42 Main St, New Castle, NH 03854
/30
$1,485,000
- 3 Beds
- 2 Baths
- 1,424 Sq Ft
17 Elm Ct, New Castle, NH 03854

Welcome to your perfect summer sanctuary in the heart of New Castle, NH—where coastal charm, timeless character, and a front-row seat to the Piscataqua River come together in one unforgettable setting. Tucked away on a quiet side street, this delightful antique cottage is designed for those who dream of effortless summer living by the sea. While fully equipped for year-round comfort, the home

Laura Ludes Madden Group

17 Elm Ct, New Castle, NH 03854
/56
$2,350,000
- 3 Beds
- 3.5 Baths
- 3,144 Sq Ft
22 Colonial Ln, New Castle, NH 03854

This elegant custom William Ross design home blends classic historical influence with the functionality of modern living. Just 12 years young, it showcases exceptional craftsmanship, thoughtful design, and top-tier finishes throughout. Privately set at the end of Colonial Lane, the home is surrounded by gardens offering the perfect balance of seclusion and convenience. Just minutes from downtown

Margaret Pesce Great Island Realty LLC

22 Colonial Ln, New Castle, NH 03854
/20
$2,900,000
- 4 Beds
- 2.5 Baths
- 2,621 Sq Ft
91 Mainmast Cir, New Castle, NH 03854

Not in a Flood Zone! Mooring Possibility! Large waterfront lot .68 acres providing endless building expansion capabilities to suit your desires! 174' of waterfrontage with direct water access! High & Dry! Look to embrace the serenity of island living in quintessential New Castle! Sitting nicely perched on BOS'NS' Hill overlooking the Piscataqua River Back Channel/Little Harbor. Enjoy kayaking,

Jason Saphire www.HomeZu.com

91 Mainmast Cir, New Castle, NH 03854
/55
$5,695,000 New Construction
- 4 Beds
- 3.5 Baths
- 3,976 Sq Ft
30 Oliver St, New Castle, NH 03854

Welcome to 30 Oliver Street, a rare opportunity to own a custom-built 4-bedroom, 4-bath home in the heart of New Castle. Designed by renowned Maugel Destefano Architects and built by Auger Builders, this residence blends timeless craftsmanship with modern coastal style and high-end finishes throughout.The stunning kitchen features cathedral ceilings, a large center island, hidden pantry,

Jim Giampa Carey Giampa, LLC/Rye

30 Oliver St, New Castle, NH 03854

New Hampshire New Castle New Castle Island

Why Live in New Castle Island

First settled in the early 1600s and incorporated in 1693, New Castle has humble beginnings as a small fishing village off the coast of New Hampshire. Soon after its incorporation, the island housed several military forts that were pivotal during the Revolutionary War. Today, this historic community has a population of about 1,000 people across the one-square-mile island, and many homes date back hundreds of years, preserving a piece of the island’s history. Residents of New Castle Island often live here year-round, enjoying a coastal lifestyle while being within a quick drive from Portsmouth and just over an hour from Boston. “People that live here don’t move. They bounce from house to house, but they’re not leaving,” says Janet Sylvester, Owner/Broker at Great Island Realty and New Castle Island resident for 25 years. “It really is special. There are a lot of people still living here, generation after generation after generation. The island’s hilly residential streets typically feature homes with tidy landscaping, pocket gardens and shade trees. A few homes have waterfront views, but even those inland properties are within a quick walk of the water. Some of New Castle Island’s

Learn more about living in New Castle Island

Frequently Asked Questions

Is New Castle Island a good place to live?

New Castle Island is a good place to live. New Castle Island is considered car-dependent and somewhat bikeable. New Castle Island has 1 park for recreational activities. It has a median age of 63. The average household income is $183,694 which is above the national average. College graduates make up 72.3% of residents. A majority of residents in New Castle Island are home owners, with 11.9% of residents renting and 88.1% of residents owning their home. A local real estate agent serving New Castle Island can help you decide if this neighborhood is the right one for you. Learn more on our New Castle Island neighborhood guide.

What are the best public schools in New Castle Island?

The best public schools that serve New Castle Island are:

Maude H. Trefethen School has an A+ Niche grade and a student teacher ratio of 7:1.
Portsmouth High School has an A Niche grade, a student teacher ratio of 12:1 and an average review score of 4.0.
Little Harbour School has an A Niche grade and a student teacher ratio of 10:1.

What are the most popular zip codes in New Castle Island, New Castle, NH?

The most popular zip codes in New Castle Island, New Castle, NH include 03854, 03905, 03904, 03870 and 03801.

What are the most popular neighborhoods near New Castle Island, New Castle, NH?

The most popular neighborhoods near New Castle Island, New Castle, NH are Kittery Point, South End, Badgers Island, Downtown Portsmouth and West End.

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Copyright 2025 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.