Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$514,892$248 / 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 96How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026

817 GLOUCESTER ST

ANTIOCH, CA 94509
4
Beds
2.5
Baths
2,075 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.
0.15 ac
Lot SizeThe size of the land the home sits on, from county records.
1980
Year BuiltThe year the home was originally built, according to county records.
1
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

$515K
$493K low$536K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,138 (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.$240,869 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$57,033
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$183,836
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$236,147

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.29
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
46
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
43
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
31
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.

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.1985
Lot (acres)The size of the land the home sits on, from county records.0.15
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(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.

M
Park Middle SchoolD
Middle · Grades 6–8 · 0.2 mi
E
Sutter Elementary SchoolC
Elementary · Grades KG–5 · 0.4 mi
H
Antioch High SchoolD
High · Grades 9–12 · 1.1 mi

District: Antioch Unified School District

Neighborhood · ZIP 94509These 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.118
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.83
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.369

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.14%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.15%
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.67,731
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,169 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$76,351
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$104,120
Average tempThe average temperature here across a full year.60°F
Annual precipHow much rain and melted snow falls here in a typical year.17 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.78%

Owner Tools

Do you own this home?
Claim this home

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

817 Gloucester St 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 81% of homes in Contra Costa County
  • Costs less per square foot than 97% of homes in Contra Costa County
  • Bigger than 80% of homes in Antioch 94509
  • Newer than 71% of homes in Antioch 94509

What homes are worth in Antioch 94509

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

This home
$157K$762K

This home is worth more than 52% of homes in Antioch 94509.

How it measures up in Antioch 94509

The dot is this home. The mark in the middle is the typical home in Antioch 94509.

Estimated value$514,892
CheaperTypical $510,866Pricier

Pricier than 52% of homes nearby

Price per ft²$248
CheaperTypical $326Pricier

Pricier than 11% of homes nearby

Living area2,075 ft²
SmallerTypical 1,499 ft²Bigger

Bigger than 80% of homes nearby

Lot size0.15 ac
SmallerTypical 0.15 acBigger

Bigger than 54% of homes nearby

Year built1980
OlderTypical 1974Newer

Newer than 71% of homes nearby

How 817 Gloucester St ranks against every home in each area.
MeasureThis homeAntioch 94509Contra Costa County
Estimated valuepricier than$514,89252% of homes19% of homes
Price per ft²pricier than$24811% of homes3% of homes
Living areabigger than2,075 ft²80% of homes64% of homes
Lot sizebigger than0.15 ac54% of homes50% of homes
Year builtnewer than198071% of homes57% of homes

About 817 Gloucester St

How much is 817 Gloucester St, Antioch, CA worth?

The TopHap Estimate for 817 Gloucester St, Antioch, CA is $514,892 as of Aug 30, 2026. The likely range is $493,416 to $536,368. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 817 Gloucester St, Antioch, CA last sell?

817 Gloucester St, Antioch, CA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 817 Gloucester St, Antioch, CA?

817 Gloucester St, Antioch, CA has 4 bedrooms, 2.5 bathrooms, 2,075 square feet of living space and a 0.15-acre lot.

When was 817 Gloucester St, Antioch, CA built?

817 Gloucester St, Antioch, CA was built in 1980, making it 46 years old. The building has 1 story.

What schools serve 817 Gloucester St, Antioch, CA?

817 Gloucester St, Antioch, CA is assigned to Park Middle School (middle), rated D; Sutter Elementary School (elementary), rated C; Antioch High School (high), rated D. All sit in Antioch Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 817 Gloucester St, Antioch, CA compare to other homes in Antioch 94509?

Among the 18,216 homes in Antioch 94509, it is worth more than 52% of them ($514,892 against a typical $510,866), its price per square foot is higher than 11% of them ($248 against a typical $326), it is bigger than 80% of them (2,075 ft² against a typical 1,499 ft²), its lot is bigger than 54% of them (0.15 ac against a typical 0.15 ac) and it is newer than 71% of them (1980 against a typical 1974). Measured against all of Contra Costa County, it is worth more than 19% 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 817 Gloucester St, Antioch, CA?

The 2025 property tax bill for 817 Gloucester St, Antioch, CA was $3,138. The county assessed it at $240,869.

More homes on Gloucester St

Closest homes

More homes in Antioch 94509

Assigned schools

Explore the area

See this home in context

Open 817 Gloucester St on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map