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Single Family ResidenceResidential
$1,455,430$1,238 / 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 88How 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

320 NEW CASTLE AVE

PORTSMOUTH, NH 03801
3
Beds
2
Baths
1,176 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.
0.2 ac
Lot SizeThe size of the land the home sits on, from county records.
1957
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$1.5M
$1.3M low$1.6M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$12,151 (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.$1,055,700 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$829,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$226,300
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,508,790

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.46 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal

Scores 0–100; higher = greater projected risk.

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.Ranch
CountyROCKINGHAM
Lot (acres)The size of the land the home sits on, from county records.0.20
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
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck

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

E
Little Harbour Elementary SchoolA+
Elementary · Grades KG–5 · 0.4 mi
M
Portsmouth Middle SchoolA
Middle · Grades 6–8 · 0.7 mi
H
Portsmouth High SchoolA
High · Grades 9–12 · 1.2 mi

District: Portsmouth School District

Neighborhood · ZIP 03801These 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.138
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.104
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.98

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.41%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.0%
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.24,014
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.808 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$107,161
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$136,932
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

320 New Castle Ave 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 96% of homes in Rockingham County
  • Among the highest price per square foot in Rockingham County
  • Smaller than 94% of homes in Little Harbor
  • Has a smaller lot than 85% of homes in Rockingham County
  • Older than 81% of homes in Rockingham County

What homes are worth in Portsmouth 03801

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

This home
$299K$2.8M

This home is worth more than 82% of homes in Portsmouth 03801.

How it measures up in Portsmouth 03801

The dot is this home. The mark in the middle is the typical home in Portsmouth 03801.

Estimated value$1,455,430
CheaperTypical $838,484Pricier

Pricier than 82% of homes nearby

Price per ft²$1238
CheaperTypical $581Pricier

Pricier than 98% of homes nearby

Living area1,176 ft²
SmallerTypical 1,521 ft²Bigger

Bigger than 31% of homes nearby

Lot size0.2 ac
SmallerTypical 0.22 acBigger

Bigger than 44% of homes nearby

Year built1957
OlderTypical 1964Newer

Newer than 44% of homes nearby

How 320 New Castle Ave ranks against every home in each area.
MeasureThis homeLittle HarborPortsmouth 03801Rockingham County
Estimated valuepricier than$1,455,43020% of homes82% of homes96% of homes
Price per ft²pricier than$123884% of homes98% of homesalmost all homes
Living areabigger than1,176 ft²6% of homes31% of homes23% of homes
Lot sizebigger than0.2 ac42% of homes44% of homes15% of homes
Year builtnewer than195752% of homes44% of homes19% of homes

About 320 New Castle Ave

How much is 320 New Castle Ave, Portsmouth, NH worth?

The TopHap Estimate for 320 New Castle Ave, Portsmouth, NH is $1,455,430 as of Sep 24, 2026. The likely range is $1,274,089 to $1,636,771. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 320 New Castle Ave, Portsmouth, NH last sell?

320 New Castle Ave, Portsmouth, NH last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 320 New Castle Ave, Portsmouth, NH?

320 New Castle Ave, Portsmouth, NH has 3 bedrooms, 2 bathrooms, 1,176 square feet of living space and a 0.20-acre lot.

When was 320 New Castle Ave, Portsmouth, NH built?

320 New Castle Ave, Portsmouth, NH was built in 1957, making it 69 years old. It is a ranch home. The building has 1 story.

What schools serve 320 New Castle Ave, Portsmouth, NH?

320 New Castle Ave, Portsmouth, NH is assigned to Little Harbour Elementary 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 320 New Castle Ave, Portsmouth, NH compare to other homes in Portsmouth 03801?

Among the 8,130 homes in Portsmouth 03801, it is worth more than 82% of them ($1,455,430 against a typical $838,484), its price per square foot is higher than 98% of them ($1238 against a typical $581), it is bigger than 31% of them (1,176 ft² against a typical 1,521 ft²), its lot is bigger than 44% of them (0.2 ac against a typical 0.22 ac) and it is newer than 44% of them (1957 against a typical 1964). Measured against all of Rockingham County, it is worth more than 96% 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 320 New Castle Ave, Portsmouth, NH?

The 2025 property tax bill for 320 New Castle Ave, Portsmouth, NH was $12,151. The county assessed it at $1,055,700.

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