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Single Family ResidenceResidential
$444,605$373 / 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
Last sold for $370,000 on Feb 26, 2018

20 ALTER ST

CLOVERDALE, CA 95425
4
Beds
2
Baths
1,191 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.
0.16 ac
Lot SizeThe size of the land the home sits on, from county records.
1951
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
4
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$445K
$414K low$476K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$370,000 · Feb 26, 2018

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,331 (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.$429,411 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$232,114
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$197,297
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$420,992

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.35
82
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
66
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
27
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.78 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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.Single Family Residence
CountySONOMA
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.1970
Lot (acres)The size of the land the home sits on, from county records.0.16
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
HeatingThe type of heating system in the home.None
CoolingThe type of cooling or air conditioning in the home.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(5)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Foreclosure Filings(1)

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

M
WashingtonD-
Middle · Grades 5–8 · 0.3 mi
H
Cloverdale High SchoolC
High · Grades 9–12 · 0.9 mi
E
Jefferson Elementary SchoolD-
Elementary · Grades KG–4 · 1.1 mi

District: Cloverdale Unified School District

Neighborhood · ZIP 95425These 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.98
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.79
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.461

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.19%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.11,682
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.44 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$89,408
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$131,301
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.50 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

20 Alter 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 93% of homes in Sonoma County
  • Costs less per square foot than 90% of homes in Sonoma County
  • Smaller than 77% of homes in Sonoma County
  • Older than 85% of homes in Cloverdale 95425

What homes are worth in Cloverdale 95425

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

This home
$322K$1.2M

This home is worth more than 16% of homes in Cloverdale 95425.

How it measures up in Cloverdale 95425

The dot is this home. The mark in the middle is the typical home in Cloverdale 95425.

Estimated value$444,605
CheaperTypical $606,180Pricier

Pricier than 16% of homes nearby

Price per ft²$373
CheaperTypical $393Pricier

Pricier than 36% of homes nearby

Living area1,191 ft²
SmallerTypical 1,519 ft²Bigger

Bigger than 26% of homes nearby

Lot size0.16 ac
SmallerTypical 0.17 acBigger

Bigger than 49% of homes nearby

Year built1951
OlderTypical 1987Newer

Newer than 15% of homes nearby

How 20 Alter St ranks against every home in each area.
MeasureThis homeCloverdale 95425Sonoma County
Estimated valuepricier than$444,60516% of homes7% of homes
Price per ft²pricier than$37336% of homes10% of homes
Living areabigger than1,191 ft²26% of homes23% of homes
Lot sizebigger than0.16 ac49% of homes50% of homes
Year builtnewer than195115% of homes16% of homes

About 20 Alter St

How much is 20 Alter St, Cloverdale, CA worth?

The TopHap Estimate for 20 Alter St, Cloverdale, CA is $444,605 as of Sep 24, 2026. The likely range is $413,622 to $475,588. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Alter St, Cloverdale, CA last sell?

20 Alter St, Cloverdale, CA last sold on Feb 26, 2018 for $370,000, according to the county's recorded deed. TopHap holds 5 recorded sales for this parcel.

How big is 20 Alter St, Cloverdale, CA?

20 Alter St, Cloverdale, CA has 4 bedrooms, 2 bathrooms, 1,191 square feet of living space and a 0.16-acre lot.

When was 20 Alter St, Cloverdale, CA built?

20 Alter St, Cloverdale, CA was built in 1951, making it 75 years old. The building has 1 story.

What schools serve 20 Alter St, Cloverdale, CA?

20 Alter St, Cloverdale, CA is assigned to Washington (middle), rated D-; Cloverdale High School (high), rated C; Jefferson Elementary School (elementary), rated D-. All sit in Cloverdale Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Alter St, Cloverdale, CA compare to other homes in Cloverdale 95425?

Among the 3,519 homes in Cloverdale 95425, it is worth more than 16% of them ($444,605 against a typical $606,180), its price per square foot is higher than 36% of them ($373 against a typical $393), it is bigger than 26% of them (1,191 ft² against a typical 1,519 ft²), its lot is bigger than 49% of them (0.16 ac against a typical 0.17 ac) and it is newer than 15% of them (1951 against a typical 1987). Measured against all of Sonoma County, it is worth more than 7% 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 20 Alter St, Cloverdale, CA?

The 2025 property tax bill for 20 Alter St, Cloverdale, CA was $5,331. The county assessed it at $429,411.

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