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Single Family ResidenceResidential
$199,858$306 / 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 92How 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 $140,000 on May 1, 2018

421 GREAT HILL DR

BALLWIN, MO 63021
3
Beds
2
Baths
654 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.
3,999 ft²
Lot SizeThe size of the land the home sits on, from county records.
1985
Year BuiltThe year the home was originally built, according to county records.
1
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.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$200K
$184K low$215K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$140,000 · May 1, 2018

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,147 (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.$34,750 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$17,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$17,650
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$31,620
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$182,900

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
64
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
15
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
86
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
74
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
8
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.30 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
CountyST. LOUIS
Lot (acres)The size of the land the home sits on, from county records.0.09
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.No Foundation
HeatingThe type of heating system in the home.Yes
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.Carport (Unspecified)
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.Shed · 55 ft²Patio · 49 ft²

Transaction History(7)

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
Oak Brook Elementary SchoolB
Elementary · Grades KG–5 · 0.9 mi
M
Southwest Middle SchoolC+
Middle · Grades 6–8 · 1.7 mi
H
South High SchoolB+
High · Grades 9–12 · 2.1 mi

District: Parkway School District

Neighborhood · ZIP 63021These 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.41
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 100.129

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.39%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.55,113
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,498 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$113,595
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$131,969
Average tempThe average temperature here across a full year.55°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.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

421 Great Hill Dr 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 less than 96% of homes in Ballwin
  • Costs more per square foot than 98% of homes in Ballwin
  • Among the smallest homes in Ballwin
  • Has a smaller lot than 93% of homes in Ballwin
  • Newer than 78% of homes in St. Louis County

What homes are worth in Ballwin 63021

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

This home
$176K$829K

This home is worth more than 5% of homes in Ballwin 63021.

How it measures up in Ballwin 63021

The dot is this home. The mark in the middle is the typical home in Ballwin 63021.

Estimated value$199,858
CheaperTypical $365,282Pricier

Pricier than 5% of homes nearby

Price per ft²$306
CheaperTypical $214Pricier

Pricier than 97% of homes nearby

Living area654 ft²
SmallerTypical 1,685 ft²Bigger

Smaller than almost all homes nearby

Lot size3,999 ft²
SmallerTypical 0.21 acBigger

Bigger than 13% of homes nearby

Year built1985
OlderTypical 1983Newer

Newer than 58% of homes nearby

How 421 Great Hill Dr ranks against every home in each area.
MeasureThis homeBallwinBallwin 63021St. Louis County
Estimated valuepricier than$199,8584% of homes5% of homes35% of homes
Price per ft²pricier than$30698% of homes97% of homes94% of homes
Living areabigger than654 ft²almost no homesalmost no homesalmost no homes
Lot sizebigger than3,999 ft²7% of homes13% of homes10% of homes
Year builtnewer than198574% of homes58% of homes78% of homes

About 421 Great Hill Dr

How much is 421 Great Hill Dr, Ballwin, MO worth?

The TopHap Estimate for 421 Great Hill Dr, Ballwin, MO is $199,858 as of Sep 24, 2026. The likely range is $184,357 to $215,359. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 421 Great Hill Dr, Ballwin, MO last sell?

421 Great Hill Dr, Ballwin, MO last sold on May 1, 2018 for $140,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 421 Great Hill Dr, Ballwin, MO?

421 Great Hill Dr, Ballwin, MO has 3 bedrooms, 2 bathrooms, 654 square feet of living space and a 0.09-acre lot.

When was 421 Great Hill Dr, Ballwin, MO built?

421 Great Hill Dr, Ballwin, MO was built in 1985, making it 41 years old. The building has 1 story.

What schools serve 421 Great Hill Dr, Ballwin, MO?

421 Great Hill Dr, Ballwin, MO is assigned to Oak Brook Elementary School (elementary), rated B; Southwest Middle School (middle), rated C+; South High School (high), rated B+. All sit in Parkway School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 421 Great Hill Dr, Ballwin, MO compare to other homes in Ballwin 63021?

Among the 19,805 homes in Ballwin 63021, it is worth more than 5% of them ($199,858 against a typical $365,282), its price per square foot is higher than 97% of them ($306 against a typical $214), it is bigger than almost none of them (654 ft² against a typical 1,685 ft²), its lot is bigger than 13% of them (3,999 ft² against a typical 0.21 ac) and it is newer than 58% of them (1985 against a typical 1983). Measured against all of St. Louis County, it is worth more than 35% 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 421 Great Hill Dr, Ballwin, MO?

The 2025 property tax bill for 421 Great Hill Dr, Ballwin, MO was $2,147. The county assessed it at $34,750.

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