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Single Family ResidenceResidential
$639,984$229 / 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 $618,120 on Aug 12, 2026

1427 THOMAS MASON PL

BALLWIN, MO 63011
4
Beds
3.5
Baths
2,794 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.
0.32 ac
Lot SizeThe size of the land the home sits on, from county records.
1988
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
9
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$640K
$588K low$692K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$618,120 · Aug 12, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,085 (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.$99,330 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$27,170
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$72,160
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$99,330
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$522,800

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
40
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
36
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
87
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
76
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.8 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.Conventional
CountyST. LOUIS
Lot (acres)The size of the land the home sits on, from county records.0.32
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.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.Porch · 291 ft²

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.

E
Pierremont Elementary SchoolA+
Elementary · Grades KG–5 · 0.4 mi
M
South Middle SchoolA+
Middle · Grades 6–8 · 0.9 mi
H
West High SchoolA+
High · Grades 9–12 · 2.6 mi

District: Parkway School District

Neighborhood · ZIP 63011These 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.49
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.81
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.125

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.42%
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.1.1%
PopulationHow many people live in this area.37,660
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,654 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$128,367
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$146,028
Average tempThe average temperature here across a full year.55°F
Annual precipHow much rain and melted snow falls here in a typical year.41 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

1427 Thomas Mason Pl 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 91% of homes in Ballwin 63011
  • Costs more per square foot than 74% of homes in St. Louis County
  • Bigger than 86% of homes in St. Louis County
  • Has a bigger lot than 79% of homes in St. Louis County
  • Newer than 83% of homes in St. Louis County

What homes are worth in Ballwin 63011

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

This home
$163K$909K

This home is worth more than 91% of homes in Ballwin 63011.

How it measures up in Ballwin 63011

The dot is this home. The mark in the middle is the typical home in Ballwin 63011.

Estimated value$639,984
CheaperTypical $423,530Pricier

Pricier than 91% of homes nearby

Price per ft²$229
CheaperTypical $206Pricier

Pricier than 73% of homes nearby

Living area2,794 ft²
SmallerTypical 2,042 ft²Bigger

Bigger than 83% of homes nearby

Lot size0.32 ac
SmallerTypical 0.29 acBigger

Bigger than 61% of homes nearby

Year built1988
OlderTypical 1973Newer

Newer than 79% of homes nearby

How 1427 Thomas Mason Pl ranks against every home in each area.
MeasureThis homeBallwin 63011St. Louis County
Estimated valuepricier than$639,98491% of homes87% of homes
Price per ft²pricier than$22973% of homes74% of homes
Living areabigger than2,794 ft²83% of homes86% of homes
Lot sizebigger than0.32 ac61% of homes79% of homes
Year builtnewer than198879% of homes83% of homes

About 1427 Thomas Mason Pl

How much is 1427 Thomas Mason Pl, Ballwin, MO worth?

The TopHap Estimate for 1427 Thomas Mason Pl, Ballwin, MO is $639,984 as of Sep 24, 2026. The likely range is $588,389 to $691,579. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 1427 Thomas Mason Pl, Ballwin, MO last sell?

1427 Thomas Mason Pl, Ballwin, MO last sold on Aug 12, 2026 for $618,120, according to the county's recorded deed.

How big is 1427 Thomas Mason Pl, Ballwin, MO?

1427 Thomas Mason Pl, Ballwin, MO has 4 bedrooms, 3.5 bathrooms, 2,794 square feet of living space and a 0.32-acre lot.

When was 1427 Thomas Mason Pl, Ballwin, MO built?

1427 Thomas Mason Pl, Ballwin, MO was built in 1988, making it 38 years old. It is a conventional home. The building has 2 stories.

What schools serve 1427 Thomas Mason Pl, Ballwin, MO?

1427 Thomas Mason Pl, Ballwin, MO is assigned to Pierremont Elementary School (elementary), rated A+; South Middle School (middle), rated A+; West High School (high), rated A+. All sit in Parkway School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 1427 Thomas Mason Pl, Ballwin, MO compare to other homes in Ballwin 63011?

Among the 13,369 homes in Ballwin 63011, it is worth more than 91% of them ($639,984 against a typical $423,530), its price per square foot is higher than 73% of them ($229 against a typical $206), it is bigger than 83% of them (2,794 ft² against a typical 2,042 ft²), its lot is bigger than 61% of them (0.32 ac against a typical 0.29 ac) and it is newer than 79% of them (1988 against a typical 1973). Measured against all of St. Louis County, it is worth more than 87% 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 1427 Thomas Mason Pl, Ballwin, MO?

The 2025 property tax bill for 1427 Thomas Mason Pl, Ballwin, MO was $6,085. The county assessed it at $99,330.

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