18 Mainmast Circle New Castle, NH $ 2,400,000
18 Mainmast Circle
$ 2,400,000
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18 Mainmast Circle

New Castle, NH, 03854
$ 2,400,000
Bedrooms6 Baths3.1 Sq 3,730

Monthly Estimate*

$ 14,973

Listed by Susan Spaulding, The Aland Realty Group, 603-828-7214, sspaulding@alandrealty.com
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Single Family Home for sale in New Castle, NH

for $2,400,000 with 6 bedrooms and 3 full baths, 1 half bath. This 3,730 square foot home was built in 1974 on a lot size of 0.25.

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.

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Single Family Active

Price

$ 2,400,000

Bedrooms

6

Full Bath

3

Half Bath

1

Property Type

Single Family

Taxes

$ 0

Style

Contemporary,Multi-Level

Lot Size

0.25

Year Built

1974

Town/City

New Castle

County/Region

Rockingham

MLS | Web ID

5070418

Features
Interior
Basement Description Basement Stairs
Interior Amenities Wood Fireplace Wood Stove Hook-up
Basement Yes
Flooring Hardwood Tile
Beds 6
Total Rooms 9
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General
Road Frontage Yes
Sewer Pump Up
Heating Baseboard
Cooling None
Utilities Cable at Site
Roof Asphalt Shingle
Appliances Gas Cooktop Dishwasher Double Oven Refrigerator
Garage No
current use No
Flood Zone No
Zoning residential
3/4 Baths 1
Full Baths 2
Half Baths 1
Bathrooms 4
Year Built 1974
Electric 200+ Amp Service
Style Contemporary Multi-Level
Stories Count 3
Construction Status Existing
Type Single Family
Block 0
Auction No
Status Detail 0
Covenants Unknown
Construction Materials Cedar Exterior
Directions Turn onto Walton Road off 1B in New Castle continue until road curves to the right house is second on right on Mainmast Circle
High School Portsmouth High School
City New Castle
School District Portsmouth
Seasonal No
Elementary School Maude H. Trefethen School
Middle School Rye Junior High School
DOM 15
Price Per Sq Ft Total AG 643.43
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Exterior
Lot Features Wooded
Driveway Gravel
Lot Size Area 0.25
Water Source Public
Foundation Concrete
Lot 000007
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* Excluded Features
List By
Susan Spaulding

Listing Agent

The Aland Realty Group

Broker

(603) 828-7214

Phone

sspaulding@alandrealty.com

Email

Affordability Calculator

$14,973
Per Month
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Monthly Principal & Interest
$14,973
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Default based on a 30-year fixed rate of 6.375% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.
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Nearby
5042321 Elementary School
1258368 Middle School
Portsmouth High School High School
Pricing History
DatePricePrice ChangeDescription
11/21/2025$2,400,000 Listed Price

Map


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18 Mainmast Circle, New Castle, NH, 03854 is a Single Family Home for sale at $2,400,000 with 3,730 sqft and a lot size of 0.25. 18 Mainmast Circle has 6 bedrooms, 3.1 baths, and was built in 1974. The property's zip code is 03854 which is in New Castle, NH