Single Family for Sale: 18 Mainmast Circle, New Castle, NH 03854 SOLD

6 beds
2 full, 1 three quarter, 1 half baths
3,730 sqft
$2,100,000
$2,100,000
18 Mainmast Circle, New Castle, NH 03854 SOLD
6 beds
2 full, 1 three quarter, 1 half baths
3,730 sqft
$2,100,000
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Selling Price: $2,100,000
Original List Price: $2,400,000
Sold at 87.5% of list price
Sold Date: 05/14/2026

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Type Single Family
Style Multi-Level, Contemporary
Beds 6
Baths 2 full, 1 three quarter, 1 half baths
Square Feet 3,730 sqft
Lot Size 0.25 acres
Year Built 1968
City New Castle
County Rockingham
School District Portsmouth
MLS 5070418
Status Closed
DOM 115 days
Experience exceptional living in this rare 6-bedroom, 4-bath home set on a beautifully wooded and private lot in desirable New Castle, NH. Designed for both everyday comfort and impressive entertaining. This home features an open-concept kitchen and living area with soaring cathedral ceilings that create a sense of light and spaciousness. The chef’s kitchen is equipped with top-of-the-line appliances and an spacial flow into the main living space. A stunning stone fireplace anchors the room, offering warmth and architectural impact. With its unusually generous square footage for New Castle, this home provides remarkable flexibility—ideal for living, hosting guests, and dedicated work and creative spaces. Enjoy peaceful, wooded surroundings just moments from the coast. Combining space, privacy, and New Castle’s coveted low tax rate, this property offers an outstanding opportunity in one of New Hampshire’s most sought-after communities.

Lot & Building Features

Appliances Double Oven, Gas Cooktop, Dishwasher, Refrigerator
Features Interior Wood Stove Hook-up, Wood Fireplace
Utilities Cable at Site
Construction Cedar Exterior
Cooling None
Heating Hot Air
Sewer Pump Up
Water Public
Basement Description Basement Stairs
Foundation Concrete
Lot Description Wooded
Roof Asphalt Shingle
Garage No

Community and Schools

Elementary School Maude H. Trefethen School
Junior High School Rye Junior High School
Senior High School Portsmouth High School

Price History of 18 Mainmast Circle, New Castle, NH

Date Name Price Difference
03/13/2026 Price Adjustment $2,100,000 12.50%
11/21/2025 Listing Price $2,400,000 N/A
*Information provided by REWS for your reference only. The accuracy of this information cannot be verified and is not guaranteed.

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Listed by The Aland Realty Group, Susan Spaulding 603-501-0463
Sold by Tate & Foss Sotheby's International Rlty, Maggie Barrett Campbell 603-964-8028
Photo of Cheryl Waitt
Direct: 603-235-5521
Office
200 Rockingham Road.
Londonderry, NH 03053
603-437-4447
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Listing information courtesy of: The Aland Realty Group

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 07/17/2026