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Single Family ResidenceResidential
$3,621,234$400 / 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 90How 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 $5,400,000 on Sep 12, 2025

860 DIAMOND RIDGE CIR

CASTLE ROCK, CO 80108
3
Beds
4
Baths
9,061 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.
1.3 ac
Lot SizeThe size of the land the home sits on, from county records.
2023
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$3.6M
$3.3M low$4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$5,400,000 · Sep 12, 2025
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.$3,621,234
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$2,896,987

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$14,701 (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.$211,380 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$63,810
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$147,570
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$211,380
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$3,108,496

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.51
36
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
49
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
67
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
29
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.7 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.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
CountyDOUGLAS
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.2024
Lot (acres)The size of the land the home sits on, from county records.1.30
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.Concrete
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
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(4)

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.

H
Douglas County High SchoolB+
High · Grades 9–12 · 2.0 mi
E
Sage Canyon Elementary SchoolB-
Elementary · Grades KG–6 · 2.7 mi
M
Mesa Middle SchoolC+
Middle · Grades 7–8 · 4.4 mi

District: Douglas County School District Re-1

Neighborhood · ZIP 80108These 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.69
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 100.41

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.46%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.2.7%
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.37,207
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.915 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$178,720
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$215,843
Average tempThe average temperature here across a full year.48°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%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Absentee owner
Company ownedWhether the owner is a company or trust rather than a person.Yes

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

860 Diamond Ridge Cir 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.

  • Among the most valuable homes in Diamond Ridge
  • Costs more per square foot than 97% of homes in Diamond Ridge
  • Among the largest homes in Douglas County
  • Has a bigger lot than 92% of homes in Castle Rock 80108
  • Newer than 97% of homes in Diamond Ridge

What homes are worth in Castle Rock 80108

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

This home
$391K$3M

This home is worth more than almost all homes in Castle Rock 80108.

How it measures up in Castle Rock 80108

The dot is this home. The mark in the middle is the typical home in Castle Rock 80108.

Estimated value$3,621,234
CheaperTypical $887,938Pricier

Pricier than almost all homes nearby

Price per ft²$400
CheaperTypical $285Pricier

Pricier than 91% of homes nearby

Living area9,061 ft²
SmallerTypical 3,451 ft²Bigger

Bigger than almost all homes nearby

Lot size1.3 ac
SmallerTypical 0.2 acBigger

Bigger than 92% of homes nearby

Year built2023
OlderTypical 2007Newer

Newer than 93% of homes nearby

How 860 Diamond Ridge Cir ranks against every home in each area.
MeasureThis homeDiamond RidgeCastle Rock 80108Douglas County
Estimated valuepricier than$3,621,234almost all homesalmost all homesalmost all homes
Price per ft²pricier than$40097% of homes91% of homes92% of homes
Living areabigger than9,061 ft²almost all homesalmost all homesalmost all homes
Lot sizebigger than1.3 ac46% of homes92% of homes92% of homes
Year builtnewer than202397% of homes93% of homes96% of homes

About 860 Diamond Ridge Cir

How much is 860 Diamond Ridge Cir, Castle Rock, CO worth?

The TopHap Estimate for 860 Diamond Ridge Cir, Castle Rock, CO is $3,621,234 as of Jul 14, 2026. The likely range is $3,276,924 to $3,965,544. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 860 Diamond Ridge Cir, Castle Rock, CO last sell?

860 Diamond Ridge Cir, Castle Rock, CO last sold on Sep 12, 2025 for $5,400,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 860 Diamond Ridge Cir, Castle Rock, CO?

860 Diamond Ridge Cir, Castle Rock, CO has 3 bedrooms, 4 bathrooms, 9,061 square feet of living space and a 1.30-acre lot.

When was 860 Diamond Ridge Cir, Castle Rock, CO built?

860 Diamond Ridge Cir, Castle Rock, CO was built in 2023, making it 3 years old. The building has 2 stories.

What schools serve 860 Diamond Ridge Cir, Castle Rock, CO?

860 Diamond Ridge Cir, Castle Rock, CO is assigned to Douglas County High School (high), rated B+; Sage Canyon Elementary School (elementary), 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 860 Diamond Ridge Cir, Castle Rock, CO compare to other homes in Castle Rock 80108?

Among the 13,451 homes in Castle Rock 80108, it is worth more than almost all of them ($3,621,234 against a typical $887,938), its price per square foot is higher than 91% of them ($400 against a typical $285), it is bigger than almost all of them (9,061 ft² against a typical 3,451 ft²), its lot is bigger than 92% of them (1.3 ac against a typical 0.2 ac) and it is newer than 93% of them (2023 against a typical 2007). Measured against all of Douglas County, it is worth more than almost all 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 860 Diamond Ridge Cir, Castle Rock, CO?

The 2025 property tax bill for 860 Diamond Ridge Cir, Castle Rock, CO was $14,701. The county assessed it at $211,380.

More homes on Diamond Ridge Cir

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Assigned schools

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