The median sale price of a home in New Castle Island was $3.2M last month, up 47.6% since last year. The median sale price per square foot in New Castle Island is $529, down 36.1% since last year.
What is the housing market like in New Castle Island today?
In June 2025, New Castle Island home prices were up 47.6% compared to last year, selling for a median price of $3.2M.
$3M
Sale Price
+37.3% since last year
$529
Sale $/Sq. Ft.
-36.1% since last year
Over List Price
1.7%
Days on Market
62
Down Payment
—
Total Homes Sold
1
To compare other locations to the New Castle Island and U.S. housing market, enter a city, neighborhood, state, or zip code into the search bar. Learn which home features in Portsmouth add value to a home.
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View houses in New Castle Island that sold recently
School data provided by GreatSchools. School service boundaries are intended to be used as reference only. To verify enrollment eligibility for a property, contact the school directly.
Climate's impact on New Castle Island housing
Learn about natural hazards and environmental risks, such as floods, fires, wind, and heat that
could impact homes in New Castle Island.
Flood Factor
We’re working on getting current and accurate flood risk information
Fire Factor
<1% of properties are at risk of wildfire over the next 30 years
Wind Factor
New Castle Island has minimal risk of severe winds over the next 30 years
Heat Factor
We’re working on getting current and accurate heat risk information