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18 Mainmast Circle, 
New Castle, NH 03854

$2,400,000


6

Beds


4

Baths


3,730

Sq Ft


Single Family

Active

Listed by

Susan Spaulding

The Aland Realty Group

603-501-0463

Last updated:

December 21, 2025, 01:34 AM

MLS#

5070418

Source:

PrimeMLS

About This Home

18 Mainmast Circle

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.

Home Facts

Single Family

4 Baths

6 Bedrooms

Built in 1974

Price Summary

2,400,000

$643 per Sq. Ft.

MLS #:

5070418

Last Updated:

December 21, 2025, 01:34 AM

Added:

1 month(s) ago


Rooms & Interior

Bedrooms

Total Bedrooms:

6

Bathrooms

Total Bathrooms:

4

Full Bathrooms:

2

Interior

Living Area:

3,730 Sq. Ft.


Structure

Structure

Building Area:

3,819 Sq. Ft.

Year Built:

1974


Lot

Lot Size (Sq. Ft):

10,890


Finances & Disclosures

Finances

Price:

$2,400,000

Price per Sq. Ft:

$643 per Sq. Ft.

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Copyright 2026 Prime MLS, Inc. All rights reserved. This information is deemed reliable, but not guaranteed. The data relating to real estate displayed on this Site comes in part from the IDX Program of Prime MLS. 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 January 7, 2026

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Contact an Agent

Yes, I would like more information. Please use and/or share my information with a Coldwell Banker ® affiliated agent to contact me about my real estate needs. By clicking Contact, I request to be contacted by phone or text message and consent to being contacted by automated means. I understand that my consent to receive calls or texts is not a condition of purchasing any property, goods, or services. Alternatively, I understand that I can access real estate services by email or I can contact the agent myself.

If a Coldwell Banker affiliated agent is not available in the area where I need assistance, I agree to be contacted by a real estate agent affiliated with another brand owned or licensed by Anywhere Real Estate (BHGRE®, CENTURY 21®, Corcoran®, ERA®, or Sotheby's International Realty®). I acknowledge that I have read and agree to the terms of use and privacy notice.