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Single Family ResidenceResidential
$1,616,149$784 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 92How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $1,006,000 on Sep 25, 2020

42 MAIN ST

NEW CASTLE, NH 03854
4
Beds
1.5
Baths
2,062 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
3,485 ft²
Lot SizeThe size of the land the home sits on, from county records.
1750
Year BuiltThe year the home was originally built, according to county records.
3
StoriesHow many floors the home has above ground.

Valuation

$1.6M
$1.5M low$1.7M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,006,000 · Sep 25, 2020

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,294 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$982,100 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$604,700
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$377,400
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,595,240

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Colonial
CountyROCKINGHAM
Lot (acres)The size of the land the home sits on, from county records.0.08
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Heat Pump
CoolingThe type of cooling or air conditioning in the home.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(2)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Maude H. Trefethen SchoolA+
Elementary · Grades KG–5 · 0.4 mi
M
Portsmouth Middle SchoolA
Middle · Grades 6–8 · 2.2 mi
H
Portsmouth High SchoolA
High · Grades 9–12 · 2.6 mi

District: Portsmouth School District

Neighborhood · ZIP 03854These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.152
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.107
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.101

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.89%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.43%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.5%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.9%
PopulationHow many people live in this area.874
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.454 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$173,461
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$279,784
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.47 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.54%

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Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

42 Main St measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Worth more than 97% of homes in Rockingham County
  • Costs more per square foot than 96% of homes in Rockingham County
  • Smaller than 80% of homes in New Castle 03854
  • Has a smaller lot than 94% of homes in Rockingham County
  • Among the oldest homes in Rockingham County

What homes are worth in New Castle 03854

Each bar is how many homes fall in that price range. The marker is this home.

This home
$1.4M$6.8M

This home is worth more than 7% of homes in New Castle 03854.

How it measures up in New Castle 03854

The dot is this home. The mark in the middle is the typical home in New Castle 03854.

Estimated value$1,616,149
CheaperTypical $2,815,589Pricier

Pricier than 7% of homes nearby

Price per ft²$784
CheaperTypical $924Pricier

Pricier than 22% of homes nearby

Living area2,062 ft²
SmallerTypical 3,088 ft²Bigger

Bigger than 20% of homes nearby

Lot size3,485 ft²
SmallerTypical 0.3 acBigger

Bigger than 9% of homes nearby

Year built1750
OlderTypical 1973Newer

Newer than 4% of homes nearby

How 42 Main St ranks against every home in each area.
MeasureThis homeNew Castle 03854Rockingham County
Estimated valuepricier than$1,616,1497% of homes97% of homes
Price per ft²pricier than$78422% of homes96% of homes
Living areabigger than2,062 ft²20% of homes62% of homes
Lot sizebigger than3,485 ft²9% of homes6% of homes
Year builtnewer than17504% of homesalmost no homes

About 42 Main St

How much is 42 Main St, New Castle, NH worth?

The TopHap Estimate for 42 Main St, New Castle, NH is $1,616,149 as of Sep 24, 2026. The likely range is $1,484,790 to $1,747,508. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 42 Main St, New Castle, NH last sell?

42 Main St, New Castle, NH last sold on Sep 25, 2020 for $1,006,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 42 Main St, New Castle, NH?

42 Main St, New Castle, NH has 4 bedrooms, 1.5 bathrooms, 2,062 square feet of living space and a 0.08-acre lot.

When was 42 Main St, New Castle, NH built?

42 Main St, New Castle, NH was built in 1750, making it 276 years old. It is a colonial home. The building has 3 stories.

What schools serve 42 Main St, New Castle, NH?

42 Main St, New Castle, NH is assigned to Maude H. Trefethen School (elementary), rated A+; Portsmouth Middle School (middle), rated A; Portsmouth High School (high), rated A. All sit in Portsmouth School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 42 Main St, New Castle, NH compare to other homes in New Castle 03854?

Among the 500 homes in New Castle 03854, it is worth more than 7% of them ($1,616,149 against a typical $2,815,589), its price per square foot is higher than 22% of them ($784 against a typical $924), it is bigger than 20% of them (2,062 ft² against a typical 3,088 ft²), its lot is bigger than 9% of them (3,485 ft² against a typical 0.3 ac) and it is newer than 4% of them (1750 against a typical 1973). Measured against all of Rockingham County, it is worth more than 97% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 42 Main St, New Castle, NH?

The 2025 property tax bill for 42 Main St, New Castle, NH was $5,294. The county assessed it at $982,100.

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