18 Mainmast Cir New Castle, NH 03854
New Castle Island NeighborhoodEstimated payment $13,158/month
Highlights
- Contemporary Architecture
- Cathedral Ceiling
- Fireplace
- Wooded Lot
- Wood Flooring
- Baseboard Heating
About This Home
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.
Open House Schedule
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Saturday, November 29, 202511:00 am to 1:00 pm11/29/2025 11:00:00 AM +00:0011/29/2025 1:00:00 PM +00:00Add to Calendar
Home Details
Home Type
- Single Family
Est. Annual Taxes
- $5,809
Year Built
- Built in 1974
Lot Details
- 0.25 Acre Lot
- Wooded Lot
Parking
- Gravel Driveway
Home Design
- Contemporary Architecture
- Concrete Foundation
Interior Spaces
- Property has 3 Levels
- Cathedral Ceiling
- Fireplace
- Basement
- Interior Basement Entry
- Dishwasher
Flooring
- Wood
- Tile
Bedrooms and Bathrooms
- 6 Bedrooms
Schools
- Maude H. Trefethen Elementary School
- Rye Junior High School
- Portsmouth High School
Utilities
- Baseboard Heating
- Cable TV Available
Listing and Financial Details
- Tax Lot 000007
- Assessor Parcel Number 000009
Map
Home Values in the Area
Average Home Value in this Area
Tax History
| Year | Tax Paid | Tax Assessment Tax Assessment Total Assessment is a certain percentage of the fair market value that is determined by local assessors to be the total taxable value of land and additions on the property. | Land | Improvement |
|---|---|---|---|---|
| 2024 | $5,809 | $1,077,700 | $605,600 | $472,100 |
| 2023 | $5,432 | $1,090,700 | $605,600 | $485,100 |
| 2022 | $4,887 | $1,086,000 | $605,600 | $480,400 |
| 2021 | $5,191 | $1,086,000 | $605,600 | $480,400 |
| 2020 | $6,225 | $803,000 | $472,400 | $330,600 |
| 2019 | $5,997 | $803,000 | $472,400 | $330,600 |
| 2018 | $7,723 | $803,000 | $472,400 | $330,600 |
| 2016 | $4,337 | $802,900 | $472,400 | $330,500 |
| 2015 | $4,253 | $664,500 | $364,900 | $299,600 |
| 2014 | $4,386 | $664,500 | $364,900 | $299,600 |
| 2013 | $4,246 | $664,500 | $364,900 | $299,600 |
Property History
| Date | Event | Price | List to Sale | Price per Sq Ft |
|---|---|---|---|---|
| 11/21/2025 11/21/25 | For Sale | $2,400,000 | 0.0% | $643 / Sq Ft |
| 07/06/2015 07/06/15 | Rented | $3,000 | 0.0% | -- |
| 07/03/2015 07/03/15 | Under Contract | -- | -- | -- |
| 06/27/2015 06/27/15 | For Rent | $3,000 | 0.0% | -- |
| 09/15/2014 09/15/14 | Rented | $3,000 | 0.0% | -- |
| 09/11/2014 09/11/14 | Under Contract | -- | -- | -- |
| 07/19/2014 07/19/14 | For Rent | $3,000 | +7.1% | -- |
| 08/20/2012 08/20/12 | Rented | $2,800 | -6.7% | -- |
| 07/21/2012 07/21/12 | Under Contract | -- | -- | -- |
| 07/16/2012 07/16/12 | For Rent | $3,000 | -- | -- |
Purchase History
| Date | Type | Sale Price | Title Company |
|---|---|---|---|
| Warranty Deed | $490,000 | -- |
Mortgage History
| Date | Status | Loan Amount | Loan Type |
|---|---|---|---|
| Open | $441,000 | No Value Available |
Source: PrimeMLS
MLS Number: 5070418
APN: NCAS-000009-000007
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