Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
Last sold for $1,383,813 on May 12, 2023

840 ALUMROOT ST

CASTLE ROCK, CO 80104
2
Beds
3
Baths
2,902 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.
0.23 ac
Lot SizeThe size of the land the home sits on, from county records.
1
StoriesHow many floors the home has above ground.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,383,813 · May 12, 2023

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,184 (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.$75,160 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$12,040
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$63,120
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$75,160
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,202,588

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.48
10
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
58
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
66
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
33
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
75
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.6 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.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.Ranch
CountyDouglas
Lot (acres)The size of the land the home sits on, from county records.0.23
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
FireplaceWhether the home has a fireplace, and what kind.Yes
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 460 ft²

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
South Ridge Elementary SchoolB
Elementary · Grades KG–6 · 3.2 mi
H
Douglas County High SchoolB+
High · Grades 9–12 · 4.5 mi
M
Mesa Middle SchoolC+
Middle · Grades 7–8 · 4.6 mi

District: Douglas County School District Re-1

Neighborhood · ZIP 80104These 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.110
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.96
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.45

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.35%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.6%
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.38,110
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.454 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$116,677
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$145,634
Average tempThe average temperature here across a full year.47°F
Annual precipHow much rain and melted snow falls here in a typical year.20 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.69%

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

840 Alumroot 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.

  • Bigger than 70% of homes in Castle Rock 80104
  • Has a bigger lot than 72% of homes in Douglas County

How it measures up in Castle Rock 80104

The dot is this home. The mark in the middle is the typical home in Castle Rock 80104.

Living area2,902 ft²
SmallerTypical 2,354 ft²Bigger

Bigger than 70% of homes nearby

Lot size0.23 ac
SmallerTypical 0.17 acBigger

Bigger than 71% of homes nearby

How 840 Alumroot St ranks against every home in each area.
MeasureThis homeCastle Rock 80104Douglas County
Living areabigger than2,902 ft²70% of homes58% of homes
Lot sizebigger than0.23 ac71% of homes72% of homes

About 840 Alumroot St

When did 840 Alumroot St, Castle Rock, CO last sell?

840 Alumroot St, Castle Rock, CO last sold on May 12, 2023 for $1,383,813, according to the county's recorded deed.

How big is 840 Alumroot St, Castle Rock, CO?

840 Alumroot St, Castle Rock, CO has 2 bedrooms, 3 bathrooms, 2,902 square feet of living space and a 0.23-acre lot.

What schools serve 840 Alumroot St, Castle Rock, CO?

840 Alumroot St, Castle Rock, CO is assigned to South Ridge Elementary School (elementary), rated B; Douglas County High School (high), rated B+; Mesa Middle School (middle), rated C+. All sit in Douglas County School District Re-1. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 840 Alumroot St, Castle Rock, CO compare to other homes in Castle Rock 80104?

Among the 15,708 homes in Castle Rock 80104, it is bigger than 70% of them (2,902 ft² against a typical 2,354 ft²) and its lot is bigger than 71% of them (0.23 ac against a typical 0.17 ac). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 840 Alumroot St, Castle Rock, CO?

The 2025 property tax bill for 840 Alumroot St, Castle Rock, CO was $9,184. The county assessed it at $75,160.

More homes on Alumroot St

Closest homes

More homes in Castle Rock 80104

Assigned schools

Explore the area

See this home in context

Open 840 Alumroot 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