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Single Family ResidenceResidential
$606,439$277 / 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 97How 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 $310,000 on Nov 14, 2002

4100 REGATTA DR

DISCOVERY BAY, CA 94505
4
Beds
3
Baths
2,193 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.
3,600 ft²
Lot SizeThe size of the land the home sits on, from county records.
1999
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
10
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

$606K
$590K low$623K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$310,000 · Nov 14, 2002

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,180 (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.$457,942 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$88,626
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$369,316
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$448,964

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.43
49
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
78
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
47
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
17
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
25
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.13 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%

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
CountyCONTRA COSTA
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.0.08
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

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.

M
Excelsior Middle SchoolC-
Middle · Grades 6–8 · 1.4 mi
E
Discovery Bay Elementary SchoolA-
Elementary · Grades KG–5 · 1.5 mi
H
Liberty High SchoolB+
High · Grades 9–12 · 4.9 mi

District: Byron Union Elementary School District

Neighborhood · ZIP 94505These 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.100
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.84
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.340

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.92%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.22%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.9,105
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.519 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$128,285
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$156,258
Average tempThe average temperature here across a full year.61°F
Annual precipHow much rain and melted snow falls here in a typical year.13 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.78%

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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

4100 Regatta 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 86% of homes in Discovery Bay 94505
  • Costs less per square foot than 94% of homes in Contra Costa County
  • Bigger than 69% of homes in Contra Costa County
  • Has a smaller lot than 96% of homes in Discovery Bay 94505
  • Newer than 82% of homes in Contra Costa County

What homes are worth in Discovery Bay 94505

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

This home
$473K$1.6M

This home is worth more than 14% of homes in Discovery Bay 94505.

How it measures up in Discovery Bay 94505

The dot is this home. The mark in the middle is the typical home in Discovery Bay 94505.

Estimated value$606,439
CheaperTypical $777,787Pricier

Pricier than 14% of homes nearby

Price per ft²$277
CheaperTypical $330Pricier

Pricier than 24% of homes nearby

Living area2,193 ft²
SmallerTypical 2,400 ft²Bigger

Bigger than 41% of homes nearby

Lot size3,600 ft²
SmallerTypical 0.16 acBigger

Bigger than 4% of homes nearby

Year built1999
OlderTypical 1994Newer

Newer than 61% of homes nearby

How 4100 Regatta Dr ranks against every home in each area.
MeasureThis homeDiscovery Bay 94505Contra Costa County
Estimated valuepricier than$606,43914% of homes33% of homes
Price per ft²pricier than$27724% of homes6% of homes
Living areabigger than2,193 ft²41% of homes69% of homes
Lot sizebigger than3,600 ft²4% of homes18% of homes
Year builtnewer than199961% of homes82% of homes

About 4100 Regatta Dr

How much is 4100 Regatta Dr, Discovery Bay, CA worth?

The TopHap Estimate for 4100 Regatta Dr, Discovery Bay, CA is $606,439 as of Sep 24, 2026. The likely range is $590,012 to $622,866. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 4100 Regatta Dr, Discovery Bay, CA last sell?

4100 Regatta Dr, Discovery Bay, CA last sold on Nov 14, 2002 for $310,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 4100 Regatta Dr, Discovery Bay, CA?

4100 Regatta Dr, Discovery Bay, CA has 4 bedrooms, 3 bathrooms, 2,193 square feet of living space and a 0.08-acre lot.

When was 4100 Regatta Dr, Discovery Bay, CA built?

4100 Regatta Dr, Discovery Bay, CA was built in 1999, making it 27 years old. The building has 2 stories.

What schools serve 4100 Regatta Dr, Discovery Bay, CA?

4100 Regatta Dr, Discovery Bay, CA is assigned to Excelsior Middle School (middle), rated C-; Discovery Bay Elementary School (elementary), rated A-; Liberty High School (high), rated B+. All sit in Byron Union Elementary School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 4100 Regatta Dr, Discovery Bay, CA compare to other homes in Discovery Bay 94505?

Among the 6,088 homes in Discovery Bay 94505, it is worth more than 14% of them ($606,439 against a typical $777,787), its price per square foot is higher than 24% of them ($277 against a typical $330), it is bigger than 41% of them (2,193 ft² against a typical 2,400 ft²), its lot is bigger than 4% of them (3,600 ft² against a typical 0.16 ac) and it is newer than 61% of them (1999 against a typical 1994). Measured against all of Contra Costa County, it is worth more than 33% 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 4100 Regatta Dr, Discovery Bay, CA?

The 2025 property tax bill for 4100 Regatta Dr, Discovery Bay, CA was $7,180. The county assessed it at $457,942.

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