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Single Family ResidenceResidential
$4,854,937$1,180 / 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 74How 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 $948,500 on Feb 13, 1997

545 ARMSTRONG DR

SONOMA, CA 95476
3
Beds
3.5
Baths
4,114 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.
0.52 ac
Lot SizeThe size of the land the home sits on, from county records.
1997
Year BuiltThe year the home was originally built, according to county records.
2
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.
5
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$4.9M
$3.6M low$6.1M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$948,500 · Feb 13, 1997

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$19,064 (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.$1,543,995 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$420,194
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,123,801
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,513,721

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.27
25
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
75
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.6 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
Lot (acres)The size of the land the home sits on, from county records.0.52
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
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, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(8)

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
Prestwood Elementary SchoolB
Elementary · Grades KG–5 · 0.5 mi
H
Sonoma Valley High SchoolC+
High · Grades 9–12 · 0.8 mi
M
Adele Harrison Middle SchoolC
Middle · Grades 6–8 · 1.0 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

545 Armstrong 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.

  • Among the most valuable homes in Sonoma County
  • Costs more per square foot than 98% of homes in Sonoma County
  • Bigger than 98% of homes in Sonoma 95476
  • Has a bigger lot than 79% of homes in Sonoma County
  • Newer than 87% 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
$411K$4.1M

This home is worth more than almost all 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$4,854,937
CheaperTypical $943,395Pricier

Pricier than almost all homes nearby

Price per ft²$1180
CheaperTypical $610Pricier

Pricier than 94% of homes nearby

Living area4,114 ft²
SmallerTypical 1,560 ft²Bigger

Bigger than 98% of homes nearby

Lot size0.52 ac
SmallerTypical 0.19 acBigger

Bigger than 75% of homes nearby

Year built1997
OlderTypical 1975Newer

Newer than 87% of homes nearby

How 545 Armstrong Dr ranks against every home in each area.
MeasureThis homeSonoma 95476Sonoma County
Estimated valuepricier than$4,854,937almost all homesalmost all homes
Price per ft²pricier than$118094% of homes98% of homes
Living areabigger than4,114 ft²98% of homes98% of homes
Lot sizebigger than0.52 ac75% of homes79% of homes
Year builtnewer than199787% of homes81% of homes

About 545 Armstrong Dr

How much is 545 Armstrong Dr, Sonoma, CA worth?

The TopHap Estimate for 545 Armstrong Dr, Sonoma, CA is $4,854,937 as of Sep 24, 2026. The likely range is $3,592,115 to $6,117,759. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 545 Armstrong Dr, Sonoma, CA last sell?

545 Armstrong Dr, Sonoma, CA last sold on Feb 13, 1997 for $948,500, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 545 Armstrong Dr, Sonoma, CA?

545 Armstrong Dr, Sonoma, CA has 3 bedrooms, 3.5 bathrooms, 4,114 square feet of living space and a 0.52-acre lot.

When was 545 Armstrong Dr, Sonoma, CA built?

545 Armstrong Dr, Sonoma, CA was built in 1997, making it 29 years old. The building has 2 stories.

What schools serve 545 Armstrong Dr, Sonoma, CA?

545 Armstrong Dr, Sonoma, CA is assigned to Prestwood Elementary School (elementary), rated B; Sonoma Valley High School (high), rated C+; Adele Harrison Middle School (middle), rated C. All sit in Sonoma Valley Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 545 Armstrong Dr, Sonoma, CA compare to other homes in Sonoma 95476?

Among the 11,728 homes in Sonoma 95476, it is worth more than almost all of them ($4,854,937 against a typical $943,395), its price per square foot is higher than 94% of them ($1180 against a typical $610), it is bigger than 98% of them (4,114 ft² against a typical 1,560 ft²), its lot is bigger than 75% of them (0.52 ac against a typical 0.19 ac) and it is newer than 87% of them (1997 against a typical 1975). Measured against all of Sonoma County, it is worth more than almost all 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 545 Armstrong Dr, Sonoma, CA?

The 2025 property tax bill for 545 Armstrong Dr, Sonoma, CA was $19,064. The county assessed it at $1,543,995.

More homes on Armstrong Dr

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