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Single Family ResidenceResidential
$800,547$496 / 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 86How 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 $803,000 on Apr 17, 2026

4020 JOAN AVE

CONCORD, CA 94521
4
Beds
2
Baths
1,614 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.
0.26 ac
Lot SizeThe size of the land the home sits on, from county records.
1950
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
7
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

$801K
$686K low$915K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$803,000 · Apr 17, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,238 (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.$120,417 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$30,213
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$90,204
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$118,057

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.20
10
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
1
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
42
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
35
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
14
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.6%

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.Ranch
CountyCONTRA COSTA
Lot (acres)The size of the land the home sits on, from county records.0.26
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
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.Yes

Transaction History(9)

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
El Monte Elementary SchoolC
Elementary · Grades KG–5 · 0.7 mi
M
El Dorado Middle SchoolD-
Middle · Grades 6–8 · 1.0 mi
H
Concord High SchoolC-
High · Grades 9–12 · 1.2 mi

District: Mount Diablo Unified School District

Neighborhood · ZIP 94521These 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.96
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 100.556

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.27%
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.43,000
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,071 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$121,996
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$147,183
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.20 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

4020 Joan 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 more than 90% of homes in Canterbury Village
  • Costs more per square foot than 82% of homes in Canterbury Village
  • Bigger than 73% of homes in Canterbury Village
  • Has a bigger lot than 86% of homes in Concord 94521
  • Older than 98% of homes in Concord 94521

What homes are worth in Concord 94521

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

This home
$280K$1.5M

This home is worth more than 64% of homes in Concord 94521.

How it measures up in Concord 94521

The dot is this home. The mark in the middle is the typical home in Concord 94521.

Estimated value$800,547
CheaperTypical $721,926Pricier

Pricier than 64% of homes nearby

Price per ft²$496
CheaperTypical $437Pricier

Pricier than 79% of homes nearby

Living area1,614 ft²
SmallerTypical 1,589 ft²Bigger

Bigger than 52% of homes nearby

Lot size0.26 ac
SmallerTypical 0.17 acBigger

Bigger than 86% of homes nearby

Year built1950
OlderTypical 1972Newer

Newer than 2% of homes nearby

How 4020 Joan Ave ranks against every home in each area.
MeasureThis homeCanterbury VillageConcord 94521Contra Costa County
Estimated valuepricier than$800,54790% of homes64% of homes55% of homes
Price per ft²pricier than$49682% of homes79% of homes58% of homes
Living areabigger than1,614 ft²73% of homes52% of homes43% of homes
Lot sizebigger than0.26 ac84% of homes86% of homes81% of homes
Year builtnewer than195012% of homes2% of homes14% of homes

About 4020 Joan Ave

How much is 4020 Joan Ave, Concord, CA worth?

The TopHap Estimate for 4020 Joan Ave, Concord, CA is $800,547 as of Sep 24, 2026. The likely range is $686,361 to $914,733. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 4020 Joan Ave, Concord, CA last sell?

4020 Joan Ave, Concord, CA last sold on Apr 17, 2026 for $803,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 4020 Joan Ave, Concord, CA?

4020 Joan Ave, Concord, CA has 4 bedrooms, 2 bathrooms, 1,614 square feet of living space and a 0.26-acre lot.

When was 4020 Joan Ave, Concord, CA built?

4020 Joan Ave, Concord, CA was built in 1950, making it 76 years old. It is a ranch home. The building has 1 story.

What schools serve 4020 Joan Ave, Concord, CA?

4020 Joan Ave, Concord, CA is assigned to El Monte Elementary School (elementary), rated C; El Dorado Middle School (middle), rated D-; Concord High School (high), rated C-. All sit in Mount Diablo Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 4020 Joan Ave, Concord, CA compare to other homes in Concord 94521?

Among the 14,272 homes in Concord 94521, it is worth more than 64% of them ($800,547 against a typical $721,926), its price per square foot is higher than 79% of them ($496 against a typical $437), it is bigger than 52% of them (1,614 ft² against a typical 1,589 ft²), its lot is bigger than 86% of them (0.26 ac against a typical 0.17 ac) and it is newer than 2% of them (1950 against a typical 1972). Measured against all of Contra Costa County, it is worth more than 55% 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 4020 Joan Ave, Concord, CA?

The 2025 property tax bill for 4020 Joan Ave, Concord, CA was $2,238. The county assessed it at $120,417.

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