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Single Family ResidenceResidential
$665,000$350 / 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 94How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026

21 LIBRARY ST

HUDSON, NH 03051
3
Beds
1.5
Baths
1,899 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.
0.24 ac
Lot SizeThe size of the land the home sits on, from county records.
2025
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

$665K
$622K low$708K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,873 (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.$401,700 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$117,300
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$284,400
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$117,300

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.34
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
1
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
56
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
87
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
25
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
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.Colonial
CountyHILLSBOROUGH
Lot (acres)The size of the land the home sits on, from county records.0.23
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

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

E
Dr. H. O. Smith Elementary School
Elementary · Grades 1–1 · 0.2 mi
M
Hudson Memorial SchoolC+
Middle · Grades 6–8 · 0.7 mi
H
Alvirne High SchoolC
High · Grades 9–12 · 2.1 mi

District: Hudson School District

Neighborhood · ZIP 03051These 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.71
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.101
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.88

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.98%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.26%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.26,169
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.892 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$122,526
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$145,618
Average tempThe average temperature here across a full year.47°F
Annual precipHow much rain and melted snow falls here in a typical year.45 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

21 Library 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 77% of homes in Hudson 03051
  • Costs more per square foot than 71% of homes in Hillsborough County
  • Has a smaller lot than 94% of homes in Hudson 03051
  • Among the newest homes in Hudson 03051

What homes are worth in Hudson 03051

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

This home
$287K$897K

This home is worth more than 77% of homes in Hudson 03051.

How it measures up in Hudson 03051

The dot is this home. The mark in the middle is the typical home in Hudson 03051.

Estimated value$665,000
CheaperTypical $547,574Pricier

Pricier than 77% of homes nearby

Price per ft²$350
CheaperTypical $335Pricier

Pricier than 59% of homes nearby

Living area1,899 ft²
SmallerTypical 1,664 ft²Bigger

Bigger than 64% of homes nearby

Lot size0.24 ac
SmallerTypical 0.82 acBigger

Bigger than 6% of homes nearby

Year built2025
OlderTypical 1985Newer

Newer than almost all homes nearby

How 21 Library St ranks against every home in each area.
MeasureThis homeHudson 03051Hillsborough County
Estimated valuepricier than$665,00077% of homes76% of homes
Price per ft²pricier than$35059% of homes71% of homes
Living areabigger than1,899 ft²64% of homes57% of homes
Lot sizebigger than0.24 ac6% of homes27% of homes
Year builtnewer than2025almost all homesalmost all homes

About 21 Library St

How much is 21 Library St, Hudson, NH worth?

The TopHap Estimate for 21 Library St, Hudson, NH is $665,000 as of Oct 21, 2026. The likely range is $622,442 to $707,558. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Library St, Hudson, NH last sell?

21 Library St, Hudson, NH last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 Library St, Hudson, NH?

21 Library St, Hudson, NH has 3 bedrooms, 1.5 bathrooms, 1,899 square feet of living space and a 0.23-acre lot.

When was 21 Library St, Hudson, NH built?

21 Library St, Hudson, NH was built in 2025, making it 1 years old. It is a colonial home. The building has 2 stories.

What schools serve 21 Library St, Hudson, NH?

21 Library St, Hudson, NH is assigned to Dr. H. O. Smith Elementary School (elementary); Hudson Memorial School (middle), rated C+; Alvirne High School (high), rated C. All sit in Hudson School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Library St, Hudson, NH compare to other homes in Hudson 03051?

Among the 8,929 homes in Hudson 03051, it is worth more than 77% of them ($665,000 against a typical $547,574), its price per square foot is higher than 59% of them ($350 against a typical $335), it is bigger than 64% of them (1,899 ft² against a typical 1,664 ft²), its lot is bigger than 6% of them (0.24 ac against a typical 0.82 ac) and it is newer than almost all of them (2025 against a typical 1985). Measured against all of Hillsborough County, it is worth more than 76% 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 Library St, Hudson, NH?

The 2025 property tax bill for 21 Library St, Hudson, NH was $6,873. The county assessed it at $401,700.

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