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Single Family ResidenceResidential
$1,536,678$587 / 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 91How 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
Last sold for $1,535,000 on Apr 27, 2026

3877 15TH ST

BOULDER, CO 80304
4
Beds
3 / 3
Baths
2,616 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.
1981
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.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.5M
$1.4M low$1.7M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,535,000 · Apr 27, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,784 (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.$100,232 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$49,606
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$50,626
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$92,125
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,474,000

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyBOULDER
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.2000
Lot (acres)The size of the land the home sits on, from county records.0.17
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.Asphalt
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
CoolingThe type of cooling or air conditioning in the home.Central
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
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 · 180 ft²

Transaction History(5)

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
Crest View Elementary SchoolA-
Elementary · Grades KG–5 · 0.5 mi
M
Centennial Middle SchoolA-
Middle · Grades 6–8 · 0.6 mi
H
Boulder High SchoolC
High · Grades 9–12 · 2.2 mi

District: Boulder Valley School District Re-2

Neighborhood · ZIP 80304These 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.126
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.94
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.46

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.33%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.12%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.26,373
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,813 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$119,821
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$151,092
Average tempThe average temperature here across a full year.49°F
Annual precipHow much rain and melted snow falls here in a typical year.19 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.69%

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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

3877 15th 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 89% of homes in Boulder County
  • Costs more per square foot than 84% of homes in Boulder County
  • Bigger than 73% of homes in Norwood / Quince

What homes are worth in Boulder 80304

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

This home
$234K$4.4M

This home is worth more than 62% of homes in Boulder 80304.

How it measures up in Boulder 80304

The dot is this home. The mark in the middle is the typical home in Boulder 80304.

Estimated value$1,536,678
CheaperTypical $1,318,350Pricier

Pricier than 62% of homes nearby

Price per ft²$587
CheaperTypical $610Pricier

Pricier than 45% of homes nearby

Living area2,616 ft²
SmallerTypical 1,960 ft²Bigger

Bigger than 68% of homes nearby

Lot size0.17 ac
SmallerTypical 0.18 acBigger

Bigger than 44% of homes nearby

Year built1981
OlderTypical 1978Newer

Newer than 55% of homes nearby

How 3877 15th St ranks against every home in each area.
MeasureThis homeNorwood / QuinceBoulder 80304Boulder County
Estimated valuepricier than$1,536,67873% of homes62% of homes89% of homes
Price per ft²pricier than$58759% of homes45% of homes84% of homes
Living areabigger than2,616 ft²73% of homes68% of homes72% of homes
Lot sizebigger than0.17 ac40% of homes44% of homes45% of homes
Year builtnewer than198140% of homes55% of homes45% of homes

About 3877 15th St

How much is 3877 15th St, Boulder, CO worth?

The TopHap Estimate for 3877 15th St, Boulder, CO is $1,536,678 as of Oct 21, 2026. The likely range is $1,394,510 to $1,678,846. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 3877 15th St, Boulder, CO last sell?

3877 15th St, Boulder, CO last sold on Apr 27, 2026 for $1,535,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 3877 15th St, Boulder, CO?

3877 15th St, Boulder, CO has 4 bedrooms, 3 bathrooms, 2,616 square feet of living space and a 0.17-acre lot.

When was 3877 15th St, Boulder, CO built?

3877 15th St, Boulder, CO was built in 1981, making it 45 years old. The building has 2 stories.

What schools serve 3877 15th St, Boulder, CO?

3877 15th St, Boulder, CO is assigned to Crest View Elementary School (elementary), rated A-; Centennial Middle School (middle), rated A-; Boulder High School (high), rated C. All sit in Boulder Valley School District Re-2. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 3877 15th St, Boulder, CO compare to other homes in Boulder 80304?

Among the 10,445 homes in Boulder 80304, it is worth more than 62% of them ($1,536,678 against a typical $1,318,350), its price per square foot is higher than 45% of them ($587 against a typical $610), it is bigger than 68% of them (2,616 ft² against a typical 1,960 ft²), its lot is bigger than 44% of them (0.17 ac against a typical 0.18 ac) and it is newer than 55% of them (1981 against a typical 1978). Measured against all of Boulder County, it is worth more than 89% 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 3877 15th St, Boulder, CO?

The 2025 property tax bill for 3877 15th St, Boulder, CO was $8,784. The county assessed it at $100,232.

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