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Single Family ResidenceResidential
$672,438$435 / 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 93How 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 $352,500 on Oct 30, 2020

406 N 21ST ST

BOISE, ID 83702
2
Beds
2
Baths
1,546 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.
0.17 ac
Lot SizeThe size of the land the home sits on, from county records.
1932
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$672K
$623K low$722K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$352,500 · Oct 30, 2020

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,974 (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.$546,000 (2026)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$556,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$546,000

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.2 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
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.0.2 percent flood zone

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.Conventional
CountyADA
Lot (acres)The size of the land the home sits on, from county records.0.17
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Yes
CoolingThe type of cooling or air conditioning in the home.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
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 · 388 ft²Patio · 388 ft²Porch · 30 ft²

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.

M
North Junior High SchoolA-
Middle · Grades 7–9 · 0.6 mi
E
Whittier Elementary SchoolC-
Elementary · Grades PK–6 · 0.6 mi
H
Boise Senior High SchoolB
High · Grades 9–12 · 0.7 mi

District: Boise City Independent School District 1

Neighborhood · ZIP 83702These 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.113
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.69

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.92%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.38%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.2%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.27,736
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.404 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$89,131
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$125,125
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.21 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.64%

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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

406 N 21st 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 73% of homes in West End
  • Costs more per square foot than 92% of homes in Ada County
  • Smaller than 71% of homes in Ada County
  • Has a bigger lot than 83% of homes in West End
  • Older than 97% of homes in Ada County

What homes are worth in Boise 83702

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

This home
$300K$2.5M

This home is worth more than 31% of homes in Boise 83702.

How it measures up in Boise 83702

The dot is this home. The mark in the middle is the typical home in Boise 83702.

Estimated value$672,438
CheaperTypical $851,596Pricier

Pricier than 31% of homes nearby

Price per ft²$435
CheaperTypical $484Pricier

Pricier than 31% of homes nearby

Living area1,546 ft²
SmallerTypical 1,906 ft²Bigger

Bigger than 35% of homes nearby

Lot size0.17 ac
SmallerTypical 0.14 acBigger

Bigger than 61% of homes nearby

Year built1932
OlderTypical 1953Newer

Newer than 29% of homes nearby

How 406 N 21st St ranks against every home in each area.
MeasureThis homeWest EndBoise 83702Ada County
Estimated valuepricier than$672,43873% of homes31% of homes71% of homes
Price per ft²pricier than$43558% of homes31% of homes92% of homes
Living areabigger than1,546 ft²53% of homes35% of homes29% of homes
Lot sizebigger than0.17 ac83% of homes61% of homes37% of homes
Year builtnewer than193223% of homes29% of homes3% of homes

About 406 N 21st St

How much is 406 N 21st St, Boise, ID worth?

The TopHap Estimate for 406 N 21st St, Boise, ID is $672,438 as of Sep 24, 2026. The likely range is $623,260 to $721,616. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 406 N 21st St, Boise, ID last sell?

406 N 21st St, Boise, ID last sold on Oct 30, 2020 for $352,500, according to the county's recorded deed.

How big is 406 N 21st St, Boise, ID?

406 N 21st St, Boise, ID has 2 bedrooms, 2 bathrooms, 1,546 square feet of living space and a 0.17-acre lot.

When was 406 N 21st St, Boise, ID built?

406 N 21st St, Boise, ID was built in 1932, making it 94 years old. It is a conventional home. The building has 1 story.

What schools serve 406 N 21st St, Boise, ID?

406 N 21st St, Boise, ID is assigned to North Junior High School (middle), rated A-; Whittier Elementary School (elementary), rated C-; Boise Senior High School (high), rated B. All sit in Boise City Independent School District 1. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 406 N 21st St, Boise, ID compare to other homes in Boise 83702?

Among the 8,369 homes in Boise 83702, it is worth more than 31% of them ($672,438 against a typical $851,596), its price per square foot is higher than 31% of them ($435 against a typical $484), it is bigger than 35% of them (1,546 ft² against a typical 1,906 ft²), its lot is bigger than 61% of them (0.17 ac against a typical 0.14 ac) and it is newer than 29% of them (1932 against a typical 1953). Measured against all of Ada County, it is worth more than 71% 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 406 N 21st St, Boise, ID?

The 2025 property tax bill for 406 N 21st St, Boise, ID was $3,974. The county assessed it at $546,000.

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