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.
Closed
Listed by: The Aland Realty Group
Bought with: Tate & Foss Sotheby's International Rlty
$2,100,000
18 Mainmast Circle, New Castle, NH 03854
6beds
3,730sqft
Single Family Residence
Built in 1968
0.25 Acres Lot
$2,100,400 Zestimate®
$563/sqft
$6,809 Estimated rent
Home value
$2,100,400
$2.00M - $2.21M
$6,809/mo
Zestimate® history
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List your homeWhat's special
Peaceful wooded surroundingsSoaring cathedral ceilingsStunning stone fireplace
Zillow last checked:
Listing updated:
Listed by:
Susan Spaulding,
The Aland Realty Group 603-501-0463
Bought with:
Maggie Barrett Campbell
Tate & Foss Sotheby's International Rlty
Source: PrimeMLS,MLS#: 5070418
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 6
- Bathrooms: 4
- Full bathrooms: 2
- 3/4 bathrooms: 1
- 1/2 bathrooms: 1
Heating
- Hot Air
Cooling
- None
Appliances
- Included: Gas Cooktop, Dishwasher, Double Oven, Refrigerator
Features
- Flooring: Hardwood, Tile
- Basement: Basement Stairs,Interior Entry
- Has fireplace: Yes
- Fireplace features: Wood Burning, Wood Stove Hook-up
Interior area
- Total structure area: 3,819
- Total interior livable area: 3,730 sqft
- Finished area above ground: 3,243
- Finished area below ground: 487
Property
Parking
- Parking features: Gravel
Features
- Levels: 3,Multi-Level
- Stories: 3
- Frontage length: Road frontage: 111
Lot
- Size: 0.25 Acres
- Features: Wooded
Details
- Parcel number: NCASM00009B000007L000000
- Zoning description: residential
Construction
Type & style
- Home type: SingleFamily
- Architectural style: Contemporary
- Property subtype: Single Family Residence
Materials
- Cedar Exterior
- Foundation: Concrete
- Roof: Asphalt Shingle
Condition
- New construction: No
- Year built: 1968
Utilities & green energy
- Electric: 200+ Amp Service
- Sewer: Pump Up
- Utilities for property: Cable at Site
Community & neighborhood
Location
- Region: New Castle
Other
Other facts
- Road surface type: Paved
Price history
| Date | Event | Price |
|---|---|---|
| 5/14/2026 | Sold | $2,100,000-4.5%$563/sqft |
Source:  PrimeMLS #5070418 Report a problem | ||
| 5/1/2026 | Pending sale | $2,200,000$590/sqft |
Source: PrimeMLS #5070418 Report a problem | ||
| 3/13/2026 | Price change | $2,200,000-8.3%$590/sqft |
Source: PrimeMLS #5070418 Report a problem | ||
| 11/21/2025 | Listed for sale | $2,400,000+389.8%$643/sqft |
Source: PrimeMLS #5070418 Report a problem | ||
| 5/12/2005 | Sold | $490,000$131/sqft |
Source: Public Record Report a problem | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2024 | $5,809 +6.9% | $1,077,700 -1.2% |
| 2023 | $5,432 +11.2% | $1,090,700 +0.4% |
| 2022 | $4,887 -3.4% | $1,086,000 +35.2% |
| 2020 | $5,059 +1.8% | $803,000 |
| 2019 | $4,971 +3.2% | $803,000 |
| 2018 | $4,818 +2.6% | $803,000 +0% |
| 2016 | $4,697 +10.4% | $802,900 +20.8% |
| 2015 | $4,253 -3% | $664,500 |
| 2014 | $4,386 +3.3% | $664,500 |
| 2013 | $4,246 +0.8% | $664,500 +0.8% |
| 2012 | $4,212 -4.4% | $659,100 -13.2% |
| 2010 | $4,404 +37.8% | $759,300 +11.2% |
| 2008 | $3,196 +40% | $682,900 +34.3% |
| 2006 | $2,283 | $508,500 |
Find assessor info on the county website
Neighborhood: 03854
Nearby schools
GreatSchools rating
- NAMaude H. Trefethen SchoolGrades: K-6Distance: 0.2 mi
- 7/10Portsmouth Middle SchoolGrades: 6-8Distance: 2 mi
- 5/10Robert W Traip AcademyGrades: 9-12Distance: 1.7 mi
Schools provided by the listing agent
- Elementary: Maude H. Trefethen School
- Middle: Rye Junior High School
- High: Portsmouth High School
- District: Portsmouth
Source: PrimeMLS. This data may not be complete. We recommend contacting the local school district to confirm school assignments for this home.
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Estimated market value
$2,100,400
Get a cash offer in 3 minutes
Find out how much your home could sell for in as little as 3 minutes with a no-obligation cash offer.
Estimated market value
$2,100,400
- New Hampshire
- Rockingham County
- New Castle
- 03854
- 18 Mainmast Circle
Nearby cities
Nearby zip codes
Other New Castle Topics
