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CondominiumResidential
$667,938
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 Jul 14, 2026
Last sold for $700,000 on May 15, 2025

643 SEMILLON LN

SANTA ROSA, CA 95403
0
Baths
1,746 ft²
Lot SizeThe size of the land the home sits on, from county records.

Valuation

$668K
$620K low$716K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$700,000 · May 15, 2025
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.$72,947
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$58,358
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.89%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$594,991
LOANDEPOT.COM LLC · recorded May 15, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$712 (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.$59,540 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$59,540
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$59,540

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.21
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
78
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.Condominium
CountySonoma
Lot (acres)The size of the land the home sits on, from county records.0.04

Transaction History(2)

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
Hidden Valley Elementary SchoolA-
Elementary · Grades KG–6 · 1.3 mi
H
Santa Rosa High SchoolB-
High · Grades 9–12 · 1.8 mi
M
Santa Rosa Middle SchoolD-
Middle · Grades 7–8 · 2.5 mi

District: Santa Rosa Elementary School District

Neighborhood · ZIP 95403These 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.104
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.86
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.511

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.95%
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.9.4%
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.43,826
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,997 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$96,508
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$119,029
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.37 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

643 Semillon 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 less than 86% of homes in Fountaingrove
  • Has a smaller lot than 92% of homes in Sonoma County

What homes are worth in Santa Rosa 95403

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

This home
$308K$2.1M

This home is worth more than 37% of homes in Santa Rosa 95403.

How it measures up in Santa Rosa 95403

The dot is this home. The mark in the middle is the typical home in Santa Rosa 95403.

Estimated value$667,938
CheaperTypical $711,121Pricier

Pricier than 37% of homes nearby

Lot size1,746 ft²
SmallerTypical 0.15 acBigger

Bigger than 11% of homes nearby

How 643 Semillon Ln ranks against every home in each area.
MeasureThis homeFountaingroveSanta Rosa 95403Sonoma County
Estimated valuepricier than$667,93814% of homes37% of homes33% of homes
Lot sizebigger than1,746 ft²10% of homes11% of homes8% of homes

About 643 Semillon Ln

How much is 643 Semillon Ln, Santa Rosa, CA worth?

The TopHap Estimate for 643 Semillon Ln, Santa Rosa, CA is $667,938 as of Jul 14, 2026. The likely range is $620,201 to $715,675. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 643 Semillon Ln, Santa Rosa, CA last sell?

643 Semillon Ln, Santa Rosa, CA last sold on May 15, 2025 for $700,000, according to the county's recorded deed.

What schools serve 643 Semillon Ln, Santa Rosa, CA?

643 Semillon Ln, Santa Rosa, CA is assigned to Hidden Valley Elementary School (elementary), rated A-; Santa Rosa High School (high), rated B-; Santa Rosa Middle School (middle), rated D-. All sit in Santa Rosa Elementary School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 643 Semillon Ln, Santa Rosa, CA compare to other homes in Santa Rosa 95403?

Among the 12,533 homes in Santa Rosa 95403, it is worth more than 37% of them ($667,938 against a typical $711,121) and its lot is bigger than 11% of them (1,746 ft² against a typical 0.15 ac). Measured against all of Sonoma County, it is worth more than 33% 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 643 Semillon Ln, Santa Rosa, CA?

The 2025 property tax bill for 643 Semillon Ln, Santa Rosa, CA was $712. The county assessed it at $59,540.

Closest homes

More homes in Santa Rosa 95403

Assigned schools

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