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Single Family ResidenceResidential
$1,024,752$313 / 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 95How 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

21317 COMUS CT

ASHBURN, VA 20147
4
Beds
4 / 1
Baths
3,274 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.
0.25 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

$1M
$974K low$1.1M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,922 (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.$984,130 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$320,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$664,130
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$920,620
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$984,130

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.49
43
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
12
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
78
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
81
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
34
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.10 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
StyleThe architectural style of the home, such as ranch or colonial.Colonial
CountyLoudoun
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.0.25
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Concrete
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
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
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.Patio · 240 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.

H
Broad Run High SchoolA-
High · Grades 9–12 · 0.6 mi
M
Farmwell Station Middle SchoolA-
Middle · Grades 6–8 · 0.8 mi
E
Dominion Trail Elementary SchoolC+
Elementary · Grades PK–5 · 7.1 mi

District: Loudoun County Public Schools

Neighborhood · ZIP 20147These 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.79
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.82
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.42

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.38%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.5%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.9%
PopulationHow many people live in this area.65,613
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,475 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$152,209
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$178,847
Average tempThe average temperature here across a full year.54°F
Annual precipHow much rain and melted snow falls here in a typical year.42 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.63%

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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

21317 Comus Ct 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 81% of homes in Ashburn 20147
  • Bigger than 74% of homes in Ashburn 20147
  • Has a bigger lot than 82% of homes in Ashburn 20147
  • Older than 76% of homes in Ashburn 20147

What homes are worth in Ashburn 20147

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

This home
$341K$1.5M

This home is worth more than 81% of homes in Ashburn 20147.

How it measures up in Ashburn 20147

The dot is this home. The mark in the middle is the typical home in Ashburn 20147.

Estimated value$1,024,752
CheaperTypical $745,200Pricier

Pricier than 81% of homes nearby

Price per ft²$313
CheaperTypical $304Pricier

Pricier than 58% of homes nearby

Living area3,274 ft²
SmallerTypical 2,447 ft²Bigger

Bigger than 74% of homes nearby

Lot size0.25 ac
SmallerTypical 0.1 acBigger

Bigger than 82% of homes nearby

Year built1994
OlderTypical 2000Newer

Newer than 24% of homes nearby

How 21317 Comus Ct ranks against every home in each area.
MeasureThis homeAshburn 20147Loudoun County
Estimated valuepricier than$1,024,75281% of homes71% of homes
Price per ft²pricier than$31358% of homes63% of homes
Living areabigger than3,274 ft²74% of homes64% of homes
Lot sizebigger than0.25 ac82% of homes67% of homes
Year builtnewer than199424% of homes28% of homes

About 21317 Comus Ct

How much is 21317 Comus Ct, Ashburn, VA worth?

The TopHap Estimate for 21317 Comus Ct, Ashburn, VA is $1,024,752 as of Sep 24, 2026. The likely range is $973,649 to $1,075,855. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

How big is 21317 Comus Ct, Ashburn, VA?

21317 Comus Ct, Ashburn, VA has 4 bedrooms, 4 bathrooms, 3,274 square feet of living space and a 0.25-acre lot.

When was 21317 Comus Ct, Ashburn, VA built?

21317 Comus Ct, Ashburn, VA was built in 1994, making it 32 years old. It is a colonial home. The building has 2 stories.

What schools serve 21317 Comus Ct, Ashburn, VA?

21317 Comus Ct, Ashburn, VA is assigned to Broad Run High School (high), rated A-; Farmwell Station Middle School (middle), rated A-; Dominion Trail Elementary School (elementary), rated C+. All sit in Loudoun County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21317 Comus Ct, Ashburn, VA compare to other homes in Ashburn 20147?

Among the 20,125 homes in Ashburn 20147, it is worth more than 81% of them ($1,024,752 against a typical $745,200), its price per square foot is higher than 58% of them ($313 against a typical $304), it is bigger than 74% of them (3,274 ft² against a typical 2,447 ft²), its lot is bigger than 82% of them (0.25 ac against a typical 0.1 ac) and it is newer than 24% of them (1994 against a typical 2000). Measured against all of Loudoun 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 21317 Comus Ct, Ashburn, VA?

The 2025 property tax bill for 21317 Comus Ct, Ashburn, VA was $7,922. The county assessed it at $984,130.

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