Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$422,528$268 / 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 95How 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 $150,000 on Apr 22, 2003

21 SCHOOL ST

ALTON, NH 03809
3
Beds
1.5
Baths
1,576 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.
0.98 ac
Lot SizeThe size of the land the home sits on, from county records.
1925
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$423K
$402K low$443K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$150,000 · Apr 22, 2003

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,988 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$230,200 (2024)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$84,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$146,200

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.8 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%

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.Colonial
CountyBELKNAP
Lot (acres)The size of the land the home sits on, from county records.0.98
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Hot Water
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.No Garage
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(1)

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
Alton Central School (Elementary)C+
Elementary · Grades PK–8 · 0.1 mi
H
Prospect Mountain High SchoolC
High · Grades 9–12 · 1.1 mi

District: Prospect Mountain High School Joint Maintenance Agreement District

Neighborhood · ZIP 03809These 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.96
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.88
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.120

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.69%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.16%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.5%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.7%
PopulationHow many people live in this area.3,428
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.82 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$103,054
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$123,748
Average tempThe average temperature here across a full year.44°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

21 School 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 less than 77% of homes in Alton 03809
  • Costs less per square foot than 71% of homes in Belknap County
  • Smaller than 65% of homes in Alton 03809
  • Has a smaller lot than 77% of homes in Alton 03809
  • Older than 88% of homes in Alton 03809

What homes are worth in Alton 03809

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

This home
$277K$3.4M

This home is worth more than 23% of homes in Alton 03809.

How it measures up in Alton 03809

The dot is this home. The mark in the middle is the typical home in Alton 03809.

Estimated value$422,528
CheaperTypical $532,804Pricier

Pricier than 23% of homes nearby

Price per ft²$268
CheaperTypical $262Pricier

Pricier than 53% of homes nearby

Living area1,576 ft²
SmallerTypical 1,963 ft²Bigger

Bigger than 35% of homes nearby

Lot size0.98 ac
SmallerTypical 2 acBigger

Bigger than 23% of homes nearby

Year built1925
OlderTypical 1990Newer

Newer than 12% of homes nearby

How 21 School St ranks against every home in each area.
MeasureThis homeAlton 03809Belknap County
Estimated valuepricier than$422,52823% of homes31% of homes
Price per ft²pricier than$26853% of homes29% of homes
Living areabigger than1,576 ft²35% of homes53% of homes
Lot sizebigger than0.98 ac23% of homes53% of homes
Year builtnewer than192512% of homes13% of homes

About 21 School St

How much is 21 School St, Alton, NH worth?

The TopHap Estimate for 21 School St, Alton, NH is $422,528 as of Aug 30, 2026. The likely range is $401,691 to $443,365. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 School St, Alton, NH last sell?

21 School St, Alton, NH last sold on Apr 22, 2003 for $150,000, according to the county's recorded deed.

How big is 21 School St, Alton, NH?

21 School St, Alton, NH has 3 bedrooms, 1.5 bathrooms, 1,576 square feet of living space and a 0.98-acre lot.

When was 21 School St, Alton, NH built?

21 School St, Alton, NH was built in 1925, making it 101 years old. It is a colonial home. The building has 2 stories.

What schools serve 21 School St, Alton, NH?

21 School St, Alton, NH is assigned to Alton Central School (Elementary) (elementary), rated C+; Prospect Mountain High School (high), rated C. All sit in Prospect Mountain High School Joint Maintenance Agreement District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 School St, Alton, NH compare to other homes in Alton 03809?

Among the 1,977 homes in Alton 03809, it is worth more than 23% of them ($422,528 against a typical $532,804), its price per square foot is higher than 53% of them ($268 against a typical $262), it is bigger than 35% of them (1,576 ft² against a typical 1,963 ft²), its lot is bigger than 23% of them (0.98 ac against a typical 2 ac) and it is newer than 12% of them (1925 against a typical 1990). Measured against all of Belknap County, it is worth more than 31% 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 21 School St, Alton, NH?

The 2024 property tax bill for 21 School St, Alton, NH was $2,988. The county assessed it at $230,200.

More homes on School St

Closest homes

More homes in Alton 03809

Assigned schools

Explore the area

See this home in context

Open 21 School 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