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Single Family ResidenceResidential
$697,248$320 / 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 93How 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

4090 SIINO AVE

CONCORD, CA 94521
4
Beds
3
Baths
2,180 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.
0.23 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.
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

$697K
$647K low$747K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,301 (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.$410,051 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$138,263
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$271,788
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$402,011

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.27
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
42
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.
36
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.

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.Traditional/Old
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.1973
Lot (acres)The size of the land the home sits on, from county records.0.23
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
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.Yes

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.

E
El Monte Elementary SchoolB-
Elementary · Grades KG–5 · 0.8 mi
M
El Dorado Middle SchoolD+
Middle · Grades 6–8 · 0.9 mi
H
Concord High SchoolC+
High · Grades 9–12 · 1.0 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

4090 Siino 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 75% of homes in Canterbury Village
  • Costs less per square foot than 98% of homes in Concord 94521
  • Bigger than 92% of homes in Canterbury Village
  • Has a bigger lot than 82% 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
$275K$1.5M

This home is worth more than 45% 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$697,248
CheaperTypical $720,015Pricier

Pricier than 45% of homes nearby

Price per ft²$320
CheaperTypical $438Pricier

Pricier than 2% of homes nearby

Living area2,180 ft²
SmallerTypical 1,588 ft²Bigger

Bigger than 82% of homes nearby

Lot size0.23 ac
SmallerTypical 0.17 acBigger

Bigger than 82% of homes nearby

Year built1950
OlderTypical 1972Newer

Newer than 2% of homes nearby

How 4090 Siino Ave ranks against every home in each area.
MeasureThis homeCanterbury VillageConcord 94521Contra Costa County
Estimated valuepricier than$697,24875% of homes45% of homes45% of homes
Price per ft²pricier than$3205% of homes2% of homes15% of homes
Living areabigger than2,180 ft²92% of homes82% of homes68% of homes
Lot sizebigger than0.23 ac78% of homes82% of homes77% of homes
Year builtnewer than195013% of homes2% of homes14% of homes

About 4090 Siino Ave

How much is 4090 Siino Ave, Concord, CA worth?

The TopHap Estimate for 4090 Siino Ave, Concord, CA is $697,248 as of Sep 24, 2026. The likely range is $647,257 to $747,239. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 4090 Siino Ave, Concord, CA last sell?

4090 Siino Ave, Concord, CA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 4090 Siino Ave, Concord, CA?

4090 Siino Ave, Concord, CA has 4 bedrooms, 3 bathrooms, 2,180 square feet of living space and a 0.23-acre lot.

When was 4090 Siino Ave, Concord, CA built?

4090 Siino Ave, Concord, CA was built in 1950, making it 76 years old. It is a traditional/old home. The building has 2 stories.

What schools serve 4090 Siino Ave, Concord, CA?

4090 Siino Ave, Concord, CA is assigned to El Monte Elementary School (elementary), rated B-; 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 4090 Siino Ave, Concord, CA compare to other homes in Concord 94521?

Among the 14,272 homes in Concord 94521, it is worth more than 45% of them ($697,248 against a typical $720,015), its price per square foot is higher than 2% of them ($320 against a typical $438), it is bigger than 82% of them (2,180 ft² against a typical 1,588 ft²), its lot is bigger than 82% of them (0.23 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 45% 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 4090 Siino Ave, Concord, CA?

The 2025 property tax bill for 4090 Siino Ave, Concord, CA was $6,301. The county assessed it at $410,051.

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