Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$3,076,381$680 / 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 85How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026
Last sold for $3,000,000 on Dec 12, 2025

18 HARBORVIEW ST

NEW CASTLE, NH 03854
3
Beds
4.5
Baths
4,524 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.
0.38 ac
Lot SizeThe size of the land the home sits on, from county records.
1999
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$3.1M
$2.6M low$3.6M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$3,000,000 · Dec 12, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$10,657 (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.$1,859,800 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,103,300
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$756,500
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,854,500
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$3,618,170

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.Contemporary
CountyROCKINGHAM
Lot (acres)The size of the land the home sits on, from county records.0.38
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
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
ViewThe type of view from the property, or another feature of the site that affects value.Waterfront-Not Specified

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 School
Elementary · Grades KG–5 · 0.7 mi
M
Portsmouth Middle SchoolB
Middle · Grades 6–8 · 2.1 mi
H
Portsmouth High SchoolA+
High · Grades 9–12 · 2.2 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%

Owner Tools

Do you own this home?
Claim this home

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

18 Harborview 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.

  • Among the most valuable homes in Rockingham County
  • Costs more per square foot than 94% of homes in Rockingham County
  • Bigger than 98% of homes in Rockingham County
  • Has a smaller lot than 72% of homes in Rockingham County
  • Newer than 82% of homes in New Castle 03854

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
$1.2M$6.3M

This home is worth more than 64% 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$3,076,381
CheaperTypical $2,655,296Pricier

Pricier than 64% of homes nearby

Price per ft²$680
CheaperTypical $881Pricier

Pricier than 17% of homes nearby

Living area4,524 ft²
SmallerTypical 3,104 ft²Bigger

Bigger than 80% of homes nearby

Lot size0.38 ac
SmallerTypical 0.3 acBigger

Bigger than 64% of homes nearby

Year built1999
OlderTypical 1971Newer

Newer than 82% of homes nearby

How 18 Harborview St ranks against every home in each area.
MeasureThis homeNew Castle 03854Rockingham County
Estimated valuepricier than$3,076,38164% of homesalmost all homes
Price per ft²pricier than$68017% of homes94% of homes
Living areabigger than4,524 ft²80% of homes98% of homes
Lot sizebigger than0.38 ac64% of homes28% of homes
Year builtnewer than199982% of homes74% of homes

About 18 Harborview St

How much is 18 Harborview St, New Castle, NH worth?

The TopHap Estimate for 18 Harborview St, New Castle, NH is $3,076,381 as of Aug 30, 2026. The likely range is $2,602,421 to $3,550,341. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 18 Harborview St, New Castle, NH last sell?

18 Harborview St, New Castle, NH last sold on Dec 12, 2025 for $3,000,000, according to the county's recorded deed.

How big is 18 Harborview St, New Castle, NH?

18 Harborview St, New Castle, NH has 3 bedrooms, 4.5 bathrooms, 4,524 square feet of living space and a 0.38-acre lot.

When was 18 Harborview St, New Castle, NH built?

18 Harborview St, New Castle, NH was built in 1999, making it 27 years old. It is a contemporary home. The building has 2 stories.

What schools serve 18 Harborview St, New Castle, NH?

18 Harborview St, New Castle, NH is assigned to Maude H. Trefethen School (elementary); Portsmouth Middle School (middle), rated B; 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 18 Harborview St, New Castle, NH compare to other homes in New Castle 03854?

Among the 499 homes in New Castle 03854, it is worth more than 64% of them ($3,076,381 against a typical $2,655,296), its price per square foot is higher than 17% of them ($680 against a typical $881), it is bigger than 80% of them (4,524 ft² against a typical 3,104 ft²), its lot is bigger than 64% of them (0.38 ac against a typical 0.3 ac) and it is newer than 82% of them (1999 against a typical 1971). Measured against all of Rockingham County, it is worth more than almost all 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 18 Harborview St, New Castle, NH?

The 2025 property tax bill for 18 Harborview St, New Castle, NH was $10,657. The county assessed it at $1,859,800.

More homes on Harborview St

Closest homes

More homes in New Castle 03854

Assigned schools

Explore the area

See this home in context

Open 18 Harborview St on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map