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CondominiumResidential
$460,485$423 / 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 98How 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 $172,000 on Mar 14, 2012

21 KNOLLS LN

SANTA ROSA, CA 95405
2
Beds
1
Baths
1,088 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 ft²
Lot SizeThe size of the land the home sits on, from county records.
1968
Year BuiltThe year the home was originally built, according to county records.
1
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

$460K
$450K low$471K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$172,000 · Mar 14, 2012

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,481 (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.$220,351 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$57,648
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$162,703
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$216,031

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.
77
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
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.1976
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
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(4)

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
Yulupa Elementary SchoolA
Elementary · Grades KG–3 · 0.2 mi
M
Montgomery High SchoolC
Middle · Grades 7–12 · 0.8 mi

District: Bennett Valley Union Elementary School District

Neighborhood · ZIP 95405These 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.59
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.89
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.549

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.30%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.2%
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.21,539
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,990 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$118,035
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$146,658
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%

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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

21 Knolls 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 93% of homes in Santa Rosa 95405
  • Costs less per square foot than 74% of homes in Sonoma County
  • Smaller than 88% of homes in Santa Rosa 95405
  • Has a smaller lot than 94% of homes in Santa Rosa 95405
  • Older than 67% of homes in Sonoma County

What homes are worth in Santa Rosa 95405

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

This home
$381K$1.6M

This home is worth more than 7% of homes in Santa Rosa 95405.

How it measures up in Santa Rosa 95405

The dot is this home. The mark in the middle is the typical home in Santa Rosa 95405.

Estimated value$460,485
CheaperTypical $699,285Pricier

Pricier than 7% of homes nearby

Price per ft²$423
CheaperTypical $452Pricier

Pricier than 36% of homes nearby

Living area1,088 ft²
SmallerTypical 1,580 ft²Bigger

Bigger than 12% of homes nearby

Lot size1 ft²
SmallerTypical 0.16 acBigger

Bigger than 6% of homes nearby

Year built1968
OlderTypical 1970Newer

Newer than 47% of homes nearby

How 21 Knolls Ln ranks against every home in each area.
MeasureThis homeSanta Rosa 95405Sonoma County
Estimated valuepricier than$460,4857% of homes8% of homes
Price per ft²pricier than$42336% of homes26% of homes
Living areabigger than1,088 ft²12% of homes16% of homes
Lot sizebigger than1 ft²6% of homes6% of homes
Year builtnewer than196847% of homes33% of homes

About 21 Knolls Ln

How much is 21 Knolls Ln, Santa Rosa, CA worth?

The TopHap Estimate for 21 Knolls Ln, Santa Rosa, CA is $460,485 as of Sep 24, 2026. The likely range is $450,016 to $470,954. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Knolls Ln, Santa Rosa, CA last sell?

21 Knolls Ln, Santa Rosa, CA last sold on Mar 14, 2012 for $172,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 21 Knolls Ln, Santa Rosa, CA?

21 Knolls Ln, Santa Rosa, CA has 2 bedrooms, 1 bathrooms and 1,088 square feet of living space.

When was 21 Knolls Ln, Santa Rosa, CA built?

21 Knolls Ln, Santa Rosa, CA was built in 1968, making it 58 years old. It is a custom design home. The building has 1 story.

What schools serve 21 Knolls Ln, Santa Rosa, CA?

21 Knolls Ln, Santa Rosa, CA is assigned to Yulupa Elementary School (elementary), rated A; Montgomery High School (middle), rated C. All sit in Bennett Valley Union Elementary School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Knolls Ln, Santa Rosa, CA compare to other homes in Santa Rosa 95405?

Among the 7,162 homes in Santa Rosa 95405, it is worth more than 7% of them ($460,485 against a typical $699,285), its price per square foot is higher than 36% of them ($423 against a typical $452), it is bigger than 12% of them (1,088 ft² against a typical 1,580 ft²), its lot is bigger than 6% of them (1 ft² against a typical 0.16 ac) and it is newer than 47% of them (1968 against a typical 1970). Measured against all of Sonoma County, it is worth more than 8% 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 21 Knolls Ln, Santa Rosa, CA?

The 2025 property tax bill for 21 Knolls Ln, Santa Rosa, CA was $2,481. The county assessed it at $220,351.

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