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Single Family ResidenceResidential
$1,295,144$218 / 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
Last sold for $1,005,000 on Sep 24, 2021

4248 ROLLING KNOLLS CT

MOUNT AIRY, MD 21771
3.5
Baths
5,948 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.
9.33 ac
Lot SizeThe size of the land the home sits on, from county records.
2004
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
8
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.3M
$1.2M low$1.4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,005,000 · Sep 24, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$12,512 (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.$1,113,700 (2026)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,037,400
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,190,000

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.64
100
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
17
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
77
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
91
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
37
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.197 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%

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.Conventional
CountyFREDERICK
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.Yes
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.Yes
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 954 ft²Porch · 90 ft²

Transaction History(2)

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
Green Valley Elementary SchoolA+
Elementary · Grades KG–5 · 1.6 mi
M
Windsor Knolls Middle SchoolA-
Middle · Grades 6–8 · 2.7 mi
H
Linganore High SchoolB
High · Grades 9–12 · 5.9 mi

District: Frederick County Public Schools

Neighborhood · ZIP 21771These 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.59
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 100.37

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.29%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.1%
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.32,505
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.382 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$151,406
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$162,296
Average tempThe average temperature here across a full year.53°F
Annual precipHow much rain and melted snow falls here in a typical year.44 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.57%

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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

4248 Rolling Knolls 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.

  • Among the most valuable homes in Mount Airy 21771
  • Costs less per square foot than 88% of homes in Mount Airy 21771
  • Among the largest homes in Mount Airy 21771
  • Has a bigger lot than 97% of homes in Frederick County
  • Newer than 88% of homes in Mount Airy 21771

What homes are worth in Mount Airy 21771

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

This home
$318K$1.1M

This home is worth more than almost all homes in Mount Airy 21771.

How it measures up in Mount Airy 21771

The dot is this home. The mark in the middle is the typical home in Mount Airy 21771.

Estimated value$1,295,144
CheaperTypical $605,835Pricier

Pricier than almost all homes nearby

Price per ft²$218
CheaperTypical $281Pricier

Pricier than 12% of homes nearby

Living area5,948 ft²
SmallerTypical 2,194 ft²Bigger

Bigger than almost all homes nearby

Lot size9.33 ac
SmallerTypical 0.95 acBigger

Bigger than 96% of homes nearby

Year built2004
OlderTypical 1988Newer

Newer than 88% of homes nearby

How 4248 Rolling Knolls Ct ranks against every home in each area.
MeasureThis homeMount Airy 21771Frederick County
Estimated valuepricier than$1,295,144almost all homesalmost all homes
Price per ft²pricier than$21812% of homes42% of homes
Living areabigger than5,948 ft²almost all homesalmost all homes
Lot sizebigger than9.33 ac96% of homes97% of homes
Year builtnewer than200488% of homes75% of homes

About 4248 Rolling Knolls Ct

How much is 4248 Rolling Knolls Ct, Mount Airy, MD worth?

The TopHap Estimate for 4248 Rolling Knolls Ct, Mount Airy, MD is $1,295,144 as of Sep 24, 2026. The likely range is $1,226,976 to $1,363,312. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 4248 Rolling Knolls Ct, Mount Airy, MD last sell?

4248 Rolling Knolls Ct, Mount Airy, MD last sold on Sep 24, 2021 for $1,005,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 4248 Rolling Knolls Ct, Mount Airy, MD?

4248 Rolling Knolls Ct, Mount Airy, MD has 3.5 bathrooms and 5,948 square feet of living space.

When was 4248 Rolling Knolls Ct, Mount Airy, MD built?

4248 Rolling Knolls Ct, Mount Airy, MD was built in 2004, making it 22 years old. It is a conventional home. The building has 1 story.

What schools serve 4248 Rolling Knolls Ct, Mount Airy, MD?

4248 Rolling Knolls Ct, Mount Airy, MD is assigned to Green Valley Elementary School (elementary), rated A+; Windsor Knolls Middle School (middle), rated A-; Linganore High School (high), rated B. All sit in Frederick County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 4248 Rolling Knolls Ct, Mount Airy, MD compare to other homes in Mount Airy 21771?

Among the 10,756 homes in Mount Airy 21771, it is worth more than almost all of them ($1,295,144 against a typical $605,835), its price per square foot is higher than 12% of them ($218 against a typical $281), it is bigger than almost all of them (5,948 ft² against a typical 2,194 ft²), its lot is bigger than 96% of them (9.33 ac against a typical 0.95 ac) and it is newer than 88% of them (2004 against a typical 1988). Measured against all of Frederick 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 4248 Rolling Knolls Ct, Mount Airy, MD?

The 2025 property tax bill for 4248 Rolling Knolls Ct, Mount Airy, MD was $12,512. The county assessed it at $1,113,700.

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