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Single Family ResidenceResidential
$1,478,761$265 / 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 80How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026
Last sold for $312,500 on Mar 30, 2007

21728 BOISE RIVER RD

CALDWELL, ID 83607
5
Beds
3
Baths
5,574 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.
5.83 ac
Lot SizeThe size of the land the home sits on, from county records.
1994
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$1.5M
$1.2M low$1.8M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$312,500 · Mar 30, 2007
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$1,478,761
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$1,183,009

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,429 (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.$846,240 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$155,940
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$690,300
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$852,910
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$846,240

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.43
71
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
82
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
65
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.43 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.1 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
CountyCANYON
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
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.Porch · 336 ft²

Transaction History(3)

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
Notus Elementary SchoolD+
Elementary · Grades PK–6 · 1.8 mi
M
Notus Jr/Sr High SchoolC+
Middle · Grades 7–12 · 1.9 mi

District: Notus School District 135

Neighborhood · ZIP 83607These 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.87
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.117
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.66

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.18%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.4%
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.43,138
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.187 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$72,681
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$89,634
Average tempThe average temperature here across a full year.51°F
Annual precipHow much rain and melted snow falls here in a typical year.11 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.64%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
Company ownedWhether the owner is a company or trust rather than a person.No

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

21728 Boise River Rd 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 98% of homes in Canyon County
  • Among the largest homes in Caldwell 83607
  • Has a bigger lot than 96% of homes in Canyon County
  • Older than 74% of homes in Caldwell 83607

What homes are worth in Caldwell 83607

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

This home
$276K$1.7M

This home is worth more than 97% of homes in Caldwell 83607.

How it measures up in Caldwell 83607

The dot is this home. The mark in the middle is the typical home in Caldwell 83607.

Estimated value$1,478,761
CheaperTypical $465,884Pricier

Pricier than 97% of homes nearby

Price per ft²$265
CheaperTypical $274Pricier

Pricier than 45% of homes nearby

Living area5,574 ft²
SmallerTypical 1,794 ft²Bigger

Bigger than almost all homes nearby

Lot size5.83 ac
SmallerTypical 0.25 acBigger

Bigger than 92% of homes nearby

Year built1994
OlderTypical 2005Newer

Newer than 26% of homes nearby

How 21728 Boise River Rd ranks against every home in each area.
MeasureThis homeCaldwell 83607Canyon County
Estimated valuepricier than$1,478,76197% of homes98% of homes
Price per ft²pricier than$26545% of homes57% of homes
Living areabigger than5,574 ft²almost all homesalmost all homes
Lot sizebigger than5.83 ac92% of homes96% of homes
Year builtnewer than199426% of homes34% of homes

About 21728 Boise River Rd

How much is 21728 Boise River Rd, Caldwell, ID worth?

The TopHap Estimate for 21728 Boise River Rd, Caldwell, ID is $1,478,761 as of Jul 14, 2026. The likely range is $1,187,291 to $1,770,231. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21728 Boise River Rd, Caldwell, ID last sell?

21728 Boise River Rd, Caldwell, ID last sold on Mar 30, 2007 for $312,500, according to the county's recorded deed.

How big is 21728 Boise River Rd, Caldwell, ID?

21728 Boise River Rd, Caldwell, ID has 5 bedrooms, 3 bathrooms and 5,574 square feet of living space.

When was 21728 Boise River Rd, Caldwell, ID built?

21728 Boise River Rd, Caldwell, ID was built in 1994, making it 32 years old. The building has 2 stories.

What schools serve 21728 Boise River Rd, Caldwell, ID?

21728 Boise River Rd, Caldwell, ID is assigned to Notus Elementary School (elementary), rated D+; Notus Jr/Sr High School (middle), rated C+. All sit in Notus School District 135. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21728 Boise River Rd, Caldwell, ID compare to other homes in Caldwell 83607?

Among the 15,232 homes in Caldwell 83607, it is worth more than 97% of them ($1,478,761 against a typical $465,884), its price per square foot is higher than 45% of them ($265 against a typical $274), it is bigger than almost all of them (5,574 ft² against a typical 1,794 ft²), its lot is bigger than 92% of them (5.83 ac against a typical 0.25 ac) and it is newer than 26% of them (1994 against a typical 2005). Measured against all of Canyon County, it is worth more than 98% 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 21728 Boise River Rd, Caldwell, ID?

The 2025 property tax bill for 21728 Boise River Rd, Caldwell, ID was $4,429. The county assessed it at $846,240.

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Closest homes

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Assigned schools

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