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Single Family ResidenceResidential
$1,001,158$552 / 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 85How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026

859 RICHARDSON LN

COTATI, CA 94931
3
Beds
2
Baths
1,815 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.
1.25 ac
Lot SizeThe size of the land the home sits on, from county records.
1954
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.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1M
$851K low$1.2M high
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$1,001,158
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$800,926

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,687 (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.$287,106 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$111,023
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$176,083
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$287,106

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.32
51
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
84
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.14 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
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.0.2 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.1959
Lot (acres)The size of the land the home sits on, from county records.1.25
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
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(1)

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
Thomas Page AcademyB-
Elementary · Grades KG–8 · 0.2 mi
H
Rancho Cortate High SchoolC-
High · Grades 9–12 · 2.2 mi

District: Cotati-Rohnert Park Unified School District

Neighborhood · ZIP 94931These 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.117
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.87
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.390

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.22%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.10%
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.11,713
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,520 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$89,956
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$112,536
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.36 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.78%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
Company ownedWhether the owner is a company or trust rather than a person.No

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

859 Richardson Ln 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 85% of homes in Cotati 94931
  • Costs more per square foot than 82% of homes in Cotati 94931
  • Bigger than 74% of homes in Cotati 94931
  • Has a bigger lot than 85% of homes in Sonoma County
  • Older than 87% of homes in Cotati 94931

What homes are worth in Cotati 94931

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

This home
$337K$1.5M

This home is worth more than 85% of homes in Cotati 94931.

How it measures up in Cotati 94931

The dot is this home. The mark in the middle is the typical home in Cotati 94931.

Estimated value$1,001,158
CheaperTypical $702,789Pricier

Pricier than 85% of homes nearby

Price per ft²$552
CheaperTypical $469Pricier

Pricier than 82% of homes nearby

Living area1,815 ft²
SmallerTypical 1,430 ft²Bigger

Bigger than 74% of homes nearby

Lot size1.25 ac
SmallerTypical 0.15 acBigger

Bigger than 84% of homes nearby

Year built1954
OlderTypical 1985Newer

Newer than 13% of homes nearby

How 859 Richardson Ln ranks against every home in each area.
MeasureThis homeCotati 94931Sonoma County
Estimated valuepricier than$1,001,15885% of homes75% of homes
Price per ft²pricier than$55282% of homes68% of homes
Living areabigger than1,815 ft²74% of homes64% of homes
Lot sizebigger than1.25 ac84% of homes85% of homes
Year builtnewer than195413% of homes18% of homes

About 859 Richardson Ln

How much is 859 Richardson Ln, Cotati, CA worth?

The TopHap Estimate for 859 Richardson Ln, Cotati, CA is $1,001,158 as of Jul 14, 2026. The likely range is $850,953 to $1,151,363. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

How big is 859 Richardson Ln, Cotati, CA?

859 Richardson Ln, Cotati, CA has 3 bedrooms, 2 bathrooms, 1,815 square feet of living space and a 1.25-acre lot.

When was 859 Richardson Ln, Cotati, CA built?

859 Richardson Ln, Cotati, CA was built in 1954, making it 72 years old. The building has 1 story.

What schools serve 859 Richardson Ln, Cotati, CA?

859 Richardson Ln, Cotati, CA is assigned to Thomas Page Academy (elementary), rated B-; Rancho Cortate High School (high), rated C-. All sit in Cotati-Rohnert Park Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 859 Richardson Ln, Cotati, CA compare to other homes in Cotati 94931?

Among the 2,954 homes in Cotati 94931, it is worth more than 85% of them ($1,001,158 against a typical $702,789), its price per square foot is higher than 82% of them ($552 against a typical $469), it is bigger than 74% of them (1,815 ft² against a typical 1,430 ft²), its lot is bigger than 84% of them (1.25 ac against a typical 0.15 ac) and it is newer than 13% of them (1954 against a typical 1985). Measured against all of Sonoma County, it is worth more than 75% 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 859 Richardson Ln, Cotati, CA?

The 2025 property tax bill for 859 Richardson Ln, Cotati, CA was $3,687. The county assessed it at $287,106.

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Assigned schools

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