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Single Family ResidenceResidential
$1,032,761$720 / 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 Oct 21, 2026
Last sold for $360,000 on Dec 2, 2010

317 MASON ST

HEALDSBURG, CA 95448
3
Beds
2
Baths
1,434 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.
1940
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
3
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1M
$880K low$1.2M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$360,000 · Dec 2, 2010

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,450 (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.$470,432 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$222,148
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$248,284
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$461,209

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.17
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
59
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.
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.minimal

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
Lot (acres)The size of the land the home sits on, from county records.0.11
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.None
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, Detached
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(3)

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
Healdsburg Elementary SchoolA-
Elementary · Grades KG–5 · 0.4 mi
M
Healdsburg Junior High SchoolB-
Middle · Grades 6–8 · 0.6 mi
H
Healdsburg High SchoolB
High · Grades 9–12 · 1.0 mi

District: Healdsburg Unified School District

Neighborhood · ZIP 95448These 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.116
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.83
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.418

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.87%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.7%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.16,668
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.84 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$102,820
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$144,374
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.48 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

317 Mason 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 more than 76% of homes in Sonoma County
  • Costs more per square foot than 88% of homes in Sonoma County
  • Has a smaller lot than 79% of homes in Healdsburg 95448
  • Older than 91% of homes in Sonoma County

What homes are worth in Healdsburg 95448

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

This home
$555K$5.8M

This home is worth more than 34% of homes in Healdsburg 95448.

How it measures up in Healdsburg 95448

The dot is this home. The mark in the middle is the typical home in Healdsburg 95448.

Estimated value$1,032,761
CheaperTypical $1,290,178Pricier

Pricier than 34% of homes nearby

Price per ft²$720
CheaperTypical $801Pricier

Pricier than 36% of homes nearby

Living area1,434 ft²
SmallerTypical 1,580 ft²Bigger

Bigger than 40% of homes nearby

Lot size0.11 ac
SmallerTypical 0.19 acBigger

Bigger than 21% of homes nearby

Year built1940
OlderTypical 1974Newer

Newer than 17% of homes nearby

How 317 Mason St ranks against every home in each area.
MeasureThis homeHealdsburg 95448Sonoma County
Estimated valuepricier than$1,032,76134% of homes76% of homes
Price per ft²pricier than$72036% of homes88% of homes
Living areabigger than1,434 ft²40% of homes41% of homes
Lot sizebigger than0.11 ac21% of homes21% of homes
Year builtnewer than194017% of homes9% of homes

About 317 Mason St

How much is 317 Mason St, Healdsburg, CA worth?

The TopHap Estimate for 317 Mason St, Healdsburg, CA is $1,032,761 as of Oct 21, 2026. The likely range is $880,006 to $1,185,516. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 317 Mason St, Healdsburg, CA last sell?

317 Mason St, Healdsburg, CA last sold on Dec 2, 2010 for $360,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 317 Mason St, Healdsburg, CA?

317 Mason St, Healdsburg, CA has 3 bedrooms, 2 bathrooms, 1,434 square feet of living space and a 0.11-acre lot.

When was 317 Mason St, Healdsburg, CA built?

317 Mason St, Healdsburg, CA was built in 1940, making it 86 years old. The building has 1 story.

What schools serve 317 Mason St, Healdsburg, CA?

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

How does 317 Mason St, Healdsburg, CA compare to other homes in Healdsburg 95448?

Among the 5,577 homes in Healdsburg 95448, it is worth more than 34% of them ($1,032,761 against a typical $1,290,178), its price per square foot is higher than 36% of them ($720 against a typical $801), it is bigger than 40% of them (1,434 ft² against a typical 1,580 ft²), its lot is bigger than 21% of them (0.11 ac against a typical 0.19 ac) and it is newer than 17% of them (1940 against a typical 1974). Measured against all of Sonoma County, it is worth more than 76% 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 317 Mason St, Healdsburg, CA?

The 2025 property tax bill for 317 Mason St, Healdsburg, CA was $5,450. The county assessed it at $470,432.

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