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Single Family ResidenceResidential
$493,985$624 / 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 95How 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
Last sold for $285,000 on Apr 8, 2013

18543 RIVERSIDE DR

SONOMA, CA 95476
2
Beds
1
Baths
792 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.
3,900 ft²
Lot SizeThe size of the land the home sits on, from county records.
1923
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
2
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$494K
$472K low$516K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$285,000 · Apr 8, 2013

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,906 (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.$357,963 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$144,440
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$213,523
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$350,945

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.39
100
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
60
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
36
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.188 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.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Custom Design
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.2000
Lot (acres)The size of the land the home sits on, from county records.0.09
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
HeatingThe type of heating system in the home.Central
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(13)

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(6)

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

E
El Verano Elementary SchoolC-
Elementary · Grades KG–5 · 0.1 mi
M
Altimira Middle SchoolD
Middle · Grades 6–8 · 0.8 mi
H
Sonoma Valley High SchoolB+
High · Grades 9–12 · 2.2 mi

District: Sonoma Valley Unified School District

Neighborhood · ZIP 95476These 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.107
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 100.432

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.90%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.24%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.4%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.33,854
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.306 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$99,739
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$144,842
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.32 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

18543 Riverside Dr 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 96% of homes in Sonoma 95476
  • Costs more per square foot than 79% of homes in Sonoma County
  • Smaller than 96% of homes in Sonoma 95476
  • Has a smaller lot than 88% of homes in Sonoma 95476
  • Older than 95% of homes in Sonoma 95476

What homes are worth in Sonoma 95476

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

This home
$434K$4M

This home is worth more than 4% of homes in Sonoma 95476.

How it measures up in Sonoma 95476

The dot is this home. The mark in the middle is the typical home in Sonoma 95476.

Estimated value$493,985
CheaperTypical $938,888Pricier

Pricier than 4% of homes nearby

Price per ft²$624
CheaperTypical $612Pricier

Pricier than 53% of homes nearby

Living area792 ft²
SmallerTypical 1,580 ft²Bigger

Bigger than 4% of homes nearby

Lot size3,900 ft²
SmallerTypical 0.18 acBigger

Bigger than 12% of homes nearby

Year built1923
OlderTypical 1976Newer

Newer than 5% of homes nearby

How 18543 Riverside Dr ranks against every home in each area.
MeasureThis homeSonoma 95476Sonoma County
Estimated valuepricier than$493,9854% of homes10% of homes
Price per ft²pricier than$62453% of homes79% of homes
Living areabigger than792 ft²4% of homes4% of homes
Lot sizebigger than3,900 ft²12% of homes15% of homes
Year builtnewer than19235% of homes5% of homes

About 18543 Riverside Dr

How much is 18543 Riverside Dr, Sonoma, CA worth?

The TopHap Estimate for 18543 Riverside Dr, Sonoma, CA is $493,985 as of Aug 30, 2026. The likely range is $471,668 to $516,302. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 18543 Riverside Dr, Sonoma, CA last sell?

18543 Riverside Dr, Sonoma, CA last sold on Apr 8, 2013 for $285,000, according to the county's recorded deed. TopHap holds 6 recorded sales for this parcel.

How big is 18543 Riverside Dr, Sonoma, CA?

18543 Riverside Dr, Sonoma, CA has 2 bedrooms, 1 bathrooms, 792 square feet of living space and a 0.09-acre lot.

When was 18543 Riverside Dr, Sonoma, CA built?

18543 Riverside Dr, Sonoma, CA was built in 1923, making it 103 years old. It is a custom design home. The building has 2 stories.

What schools serve 18543 Riverside Dr, Sonoma, CA?

18543 Riverside Dr, Sonoma, CA is assigned to El Verano Elementary School (elementary), rated C-; Altimira Middle School (middle), rated D; Sonoma Valley High School (high), rated B+. All sit in Sonoma Valley Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 18543 Riverside Dr, Sonoma, CA compare to other homes in Sonoma 95476?

Among the 11,734 homes in Sonoma 95476, it is worth more than 4% of them ($493,985 against a typical $938,888), its price per square foot is higher than 53% of them ($624 against a typical $612), it is bigger than 4% of them (792 ft² against a typical 1,580 ft²), its lot is bigger than 12% of them (3,900 ft² against a typical 0.18 ac) and it is newer than 5% of them (1923 against a typical 1976). Measured against all of Sonoma County, it is worth more than 10% 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 18543 Riverside Dr, Sonoma, CA?

The 2025 property tax bill for 18543 Riverside Dr, Sonoma, CA was $5,906. The county assessed it at $357,963.

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