Skip to content
Skip to content
TopHapOpen in map
Duplex (2 Units, Any Combination)Residential
Last sold for $770,000 on Dec 6, 2024

423 ALLEN ST

MARTINEZ, CA 94553
3
Beds
2
Baths
1,537 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.
0.11 ac
Lot SizeThe size of the land the home sits on, from county records.
1908
Year BuiltThe year the home was originally built, according to county records.
1
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.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$770,000 · Dec 6, 2024

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$10,609 (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.$785,400 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$581,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$204,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$770,000

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.51
85
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
77
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
38
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
43
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.43 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.1 percent flood zone

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Duplex (2 Units, Any Combination)
StyleThe architectural style of the home, such as ranch or colonial.Duplex Single
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.1980
Lot (acres)The size of the land the home sits on, from county records.0.12
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(12)

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
Martinez Junior High SchoolB
Middle · Grades 6–8 · 0.3 mi
H
Alhambra High SchoolA-
High · Grades 9–12 · 0.5 mi
E
John Muir Elementary SchoolB
Elementary · Grades KG–5 · 0.9 mi

District: Martinez Unified School District

Neighborhood · ZIP 94553These 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.97
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 100.490

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.29%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.4%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.5%
PopulationHow many people live in this area.49,416
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.869 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$125,557
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$148,117
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.23 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

423 Allen 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.

  • Has a smaller lot than 73% of homes in Contra Costa County
  • Among the oldest homes in Contra Costa County

How it measures up in Martinez 94553

The dot is this home. The mark in the middle is the typical home in Martinez 94553.

Living area1,537 ft²
SmallerTypical 1,549 ft²Bigger

Bigger than 50% of homes nearby

Lot size0.11 ac
SmallerTypical 0.15 acBigger

Bigger than 31% of homes nearby

Year built1908
OlderTypical 1973Newer

Older than almost all homes nearby

How 423 Allen St ranks against every home in each area.
MeasureThis homeMartinez 94553Contra Costa County
Living areabigger than1,537 ft²50% of homes39% of homes
Lot sizebigger than0.11 ac31% of homes27% of homes
Year builtnewer than1908almost no homesalmost no homes

About 423 Allen St

When did 423 Allen St, Martinez, CA last sell?

423 Allen St, Martinez, CA last sold on Dec 6, 2024 for $770,000, according to the county's recorded deed. TopHap holds 6 recorded sales for this parcel.

How big is 423 Allen St, Martinez, CA?

423 Allen St, Martinez, CA has 3 bedrooms, 2 bathrooms, 1,537 square feet of living space and a 0.12-acre lot.

When was 423 Allen St, Martinez, CA built?

423 Allen St, Martinez, CA was built in 1908, making it 118 years old. It is a duplex single home. The building has 1 story.

What schools serve 423 Allen St, Martinez, CA?

423 Allen St, Martinez, CA is assigned to Martinez Junior High School (middle), rated B; Alhambra High School (high), rated A-; John Muir Elementary School (elementary), rated B. All sit in Martinez Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 423 Allen St, Martinez, CA compare to other homes in Martinez 94553?

Among the 16,279 homes in Martinez 94553, it is bigger than 50% of them (1,537 ft² against a typical 1,549 ft²), its lot is bigger than 31% of them (0.11 ac against a typical 0.15 ac) and it is newer than almost none of them (1908 against a typical 1973). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 423 Allen St, Martinez, CA?

The 2025 property tax bill for 423 Allen St, Martinez, CA was $10,609. The county assessed it at $785,400.

More homes on Allen St

Closest homes

More homes in Martinez 94553

Assigned schools

Explore the area

See this home in context

Open 423 Allen 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