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Single Family ResidenceResidential
$4,130,048$1,767 / 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 94How 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 $2,950,000 on Sep 24, 2020

18 PIEDMONT RD

LARKSPUR, CA 94939
3
Beds
3
Baths
2,337 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.
0.2 ac
Lot SizeThe size of the land the home sits on, from county records.
1950
Year BuiltThe year the home was originally built, according to county records.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$4.1M
$3.9M low$4.4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$2,950,000 · Sep 24, 2020

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$40,378 (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.$3,292,155 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,987,308
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,304,847
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$3,227,628

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.7 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.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
StyleThe architectural style of the home, such as ranch or colonial.Contemporary
CountyMARIN
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.1999
Lot (acres)The size of the land the home sits on, from county records.0.20
HeatingThe type of heating system in the home.Central
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.Yes
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 1,520 ft²Patio · 1,520 ft²

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.

M
Hall Middle SchoolA+
Middle · Grades 6–8 · 0.7 mi
E
Neil Cummins Elementary SchoolA+
Elementary · Grades KG–5 · 0.7 mi
H
Redwood High SchoolA
High · Grades 9–12 · 0.8 mi

District: Larkspur Elementary School District

Neighborhood · ZIP 94939These 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.96
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 100.376

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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.38%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.4%
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.6,549
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,698 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$169,587
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$221,666
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.39 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

18 Piedmont Rd 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 94% of homes in Marin County
  • Costs more per square foot than 97% of homes in Marin County
  • Bigger than 72% of homes in Marin County
  • Older than 77% of homes in Marin County

What homes are worth in Larkspur 94939

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

This home
$530K$5.5M

This home is worth more than 93% of homes in Larkspur 94939.

How it measures up in Larkspur 94939

The dot is this home. The mark in the middle is the typical home in Larkspur 94939.

Estimated value$4,130,048
CheaperTypical $2,135,941Pricier

Pricier than 93% of homes nearby

Price per ft²$1767
CheaperTypical $1063Pricier

Pricier than 93% of homes nearby

Living area2,337 ft²
SmallerTypical 1,918 ft²Bigger

Bigger than 70% of homes nearby

Lot size0.2 ac
SmallerTypical 0.18 acBigger

Bigger than 56% of homes nearby

Year built1950
OlderTypical 1967Newer

Newer than 32% of homes nearby

How 18 Piedmont Rd ranks against every home in each area.
MeasureThis homeSouthwest LarkspurLarkspur 94939Marin County
Estimated valuepricier than$4,130,04892% of homes93% of homes94% of homes
Price per ft²pricier than$176794% of homes93% of homes97% of homes
Living areabigger than2,337 ft²64% of homes70% of homes72% of homes
Lot sizebigger than0.2 ac48% of homes56% of homes56% of homes
Year builtnewer than195050% of homes32% of homes23% of homes

About 18 Piedmont Rd

How much is 18 Piedmont Rd, Larkspur, CA worth?

The TopHap Estimate for 18 Piedmont Rd, Larkspur, CA is $4,130,048 as of Sep 24, 2026. The likely range is $3,866,250 to $4,393,846. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 18 Piedmont Rd, Larkspur, CA last sell?

18 Piedmont Rd, Larkspur, CA last sold on Sep 24, 2020 for $2,950,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 18 Piedmont Rd, Larkspur, CA?

18 Piedmont Rd, Larkspur, CA has 3 bedrooms, 3 bathrooms, 2,337 square feet of living space and a 0.20-acre lot.

When was 18 Piedmont Rd, Larkspur, CA built?

18 Piedmont Rd, Larkspur, CA was built in 1950, making it 76 years old. It is a contemporary home.

What schools serve 18 Piedmont Rd, Larkspur, CA?

18 Piedmont Rd, Larkspur, CA is assigned to Hall Middle School (middle), rated A+; Neil Cummins Elementary School (elementary), rated A+; Redwood High School (high), rated A. All sit in Larkspur Elementary School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 18 Piedmont Rd, Larkspur, CA compare to other homes in Larkspur 94939?

Among the 2,375 homes in Larkspur 94939, it is worth more than 93% of them ($4,130,048 against a typical $2,135,941), its price per square foot is higher than 93% of them ($1767 against a typical $1063), it is bigger than 70% of them (2,337 ft² against a typical 1,918 ft²), its lot is bigger than 56% of them (0.2 ac against a typical 0.18 ac) and it is newer than 32% of them (1950 against a typical 1967). Measured against all of Marin County, it is worth more than 94% 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 18 Piedmont Rd, Larkspur, CA?

The 2025 property tax bill for 18 Piedmont Rd, Larkspur, CA was $40,378. The county assessed it at $3,292,155.

More homes on Piedmont Rd

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Assigned schools

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