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Single Family ResidenceResidential
$110,000$135 / 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 84How 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 $75,000 on Aug 19, 2020

409 KOSTMAYER AVE

SLIDELL, LA 70458
0
Baths
816 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.
0.29 ac
Lot SizeThe size of the land the home sits on, from county records.
1990
Year BuiltThe year the home was originally built, according to county records.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$110K
$93K low$127K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$75,000 · Aug 19, 2020

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,238 (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.$8,287 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,850
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$6,437
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$8,287
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$82,870

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.58
97
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.
96
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
62
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
3
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.60 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.84%

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
CountySAINT TAMMANY
Lot (acres)The size of the land the home sits on, from county records.0.29
PoolWhether the property has a pool, and what kind, such as in-ground.No

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.

Foreclosure Filings(3)

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
W.L. Abney Elementary SchoolD+
Elementary · Grades 1–5 · 0.5 mi
M
St. Tammany Junior High SchoolC-
Middle · Grades 6–8 · 0.8 mi
H
Salmen High SchoolD+
High · Grades 9–12 · 0.8 mi

District: St. Tammany Parish School District

Neighborhood · ZIP 70458These 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.98
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.90
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.27

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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.19%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.13%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.0%
PopulationHow many people live in this area.39,272
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,660 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$68,401
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$88,836
Average tempThe average temperature here across a full year.68°F
Annual precipHow much rain and melted snow falls here in a typical year.64 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%

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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

409 Kostmayer Ave 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 95% of homes in Saint Tammany County
  • Costs more per square foot than 69% of homes in Slidell 70458
  • Smaller than 98% of homes in Saint Tammany County
  • Has a smaller lot than 80% of homes in Saint Tammany County
  • Older than 65% of homes in Saint Tammany County

What homes are worth in Slidell 70458

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

This home
$74K$549K

This home is worth more than 8% of homes in Slidell 70458.

How it measures up in Slidell 70458

The dot is this home. The mark in the middle is the typical home in Slidell 70458.

Estimated value$110,000
CheaperTypical $211,481Pricier

Pricier than 8% of homes nearby

Price per ft²$135
CheaperTypical $121Pricier

Pricier than 69% of homes nearby

Living area816 ft²
SmallerTypical 1,775 ft²Bigger

Bigger than 3% of homes nearby

Lot size0.29 ac
SmallerTypical 0.3 acBigger

Bigger than 46% of homes nearby

Year built1990
OlderTypical 1986Newer

Newer than 56% of homes nearby

How 409 Kostmayer Ave ranks against every home in each area.
MeasureThis homeSlidell 70458Saint Tammany County
Estimated valuepricier than$110,0008% of homes5% of homes
Price per ft²pricier than$13569% of homes36% of homes
Living areabigger than816 ft²3% of homes2% of homes
Lot sizebigger than0.29 ac46% of homes20% of homes
Year builtnewer than199056% of homes35% of homes

About 409 Kostmayer Ave

How much is 409 Kostmayer Ave, Slidell, LA worth?

The TopHap Estimate for 409 Kostmayer Ave, Slidell, LA is $110,000 as of Sep 24, 2026. The likely range is $92,528 to $127,472. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 409 Kostmayer Ave, Slidell, LA last sell?

409 Kostmayer Ave, Slidell, LA last sold on Aug 19, 2020 for $75,000, according to the county's recorded deed.

How big is 409 Kostmayer Ave, Slidell, LA?

409 Kostmayer Ave, Slidell, LA has 816 square feet of living space and a 0.29-acre lot.

When was 409 Kostmayer Ave, Slidell, LA built?

409 Kostmayer Ave, Slidell, LA was built in 1990, making it 36 years old.

What schools serve 409 Kostmayer Ave, Slidell, LA?

409 Kostmayer Ave, Slidell, LA is assigned to W.L. Abney Elementary School (elementary), rated D+; St. Tammany Junior High School (middle), rated C-; Salmen High School (high), rated D+. All sit in St. Tammany Parish School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 409 Kostmayer Ave, Slidell, LA compare to other homes in Slidell 70458?

Among the 14,100 homes in Slidell 70458, it is worth more than 8% of them ($110,000 against a typical $211,481), its price per square foot is higher than 69% of them ($135 against a typical $121), it is bigger than 3% of them (816 ft² against a typical 1,775 ft²), its lot is bigger than 46% of them (0.29 ac against a typical 0.3 ac) and it is newer than 56% of them (1990 against a typical 1986). Measured against all of Saint Tammany County, it is worth more than 5% 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 409 Kostmayer Ave, Slidell, LA?

The 2025 property tax bill for 409 Kostmayer Ave, Slidell, LA was $1,238. The county assessed it at $8,287.

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