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Single Family ResidenceResidential
$4,685,074$1,158 / 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 79How 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 $2,890,000 on Dec 8, 2014

1451 BIG ROCK RD

SAINT HELENA, CA 94574
3
Beds
3.5
Baths
4,045 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.
3.15 ac
Lot SizeThe size of the land the home sits on, from county records.
1990
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
7
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
6
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$4.7M
$3.7M low$5.7M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$2,890,000 · Dec 8, 2014

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$38,224 (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.$3,600,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,700,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,900,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$3,600,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$3,600,000

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.60
74
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
84
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
41
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
69
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
32
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.52 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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
CountyNAPA
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.1991
Lot (acres)The size of the land the home sits on, from county records.3.15
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
HeatingThe type of heating system in the home.Yes
CoolingThe type of cooling or air conditioning in the home.Central
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.Yes

Transaction History(16)

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.

H
St. Helena High SchoolA
High · Grades 9–12 · 1.6 mi
M
Robert Louis Stevenson Intermediate SchoolC
Middle · Grades 6–8 · 1.8 mi
E
Saint Helena Primary School
Elementary · Grades KG–2 · 1.9 mi

District: St. Helena Unified School District

Neighborhood · ZIP 94574These 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.136
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.88
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.267

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.80%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.31%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.0%
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.7,889
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.61 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$128,776
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$218,903
Average tempThe average temperature here across a full year.59°F
Annual precipHow much rain and melted snow falls here in a typical year.35 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

1451 Big Rock 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 98% of homes in Napa County
  • Costs more per square foot than 95% of homes in Napa County
  • Bigger than 97% of homes in Napa County
  • Has a bigger lot than 93% of homes in Napa County
  • Newer than 76% of homes in Saint Helena 94574

What homes are worth in Saint Helena 94574

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

This home
$611K$10M

This home is worth more than 89% of homes in Saint Helena 94574.

How it measures up in Saint Helena 94574

The dot is this home. The mark in the middle is the typical home in Saint Helena 94574.

Estimated value$4,685,074
CheaperTypical $1,691,656Pricier

Pricier than 89% of homes nearby

Price per ft²$1158
CheaperTypical $889Pricier

Pricier than 75% of homes nearby

Living area4,045 ft²
SmallerTypical 1,878 ft²Bigger

Bigger than 92% of homes nearby

Lot size3.15 ac
SmallerTypical 0.28 acBigger

Bigger than 82% of homes nearby

Year built1990
OlderTypical 1968Newer

Newer than 76% of homes nearby

How 1451 Big Rock Rd ranks against every home in each area.
MeasureThis homeSaint Helena 94574Napa County
Estimated valuepricier than$4,685,07489% of homes98% of homes
Price per ft²pricier than$115875% of homes95% of homes
Living areabigger than4,045 ft²92% of homes97% of homes
Lot sizebigger than3.15 ac82% of homes93% of homes
Year builtnewer than199076% of homes74% of homes

About 1451 Big Rock Rd

How much is 1451 Big Rock Rd, Saint Helena, CA worth?

The TopHap Estimate for 1451 Big Rock Rd, Saint Helena, CA is $4,685,074 as of Sep 24, 2026. The likely range is $3,683,386 to $5,686,762. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 1451 Big Rock Rd, Saint Helena, CA last sell?

1451 Big Rock Rd, Saint Helena, CA last sold on Dec 8, 2014 for $2,890,000, according to the county's recorded deed.

How big is 1451 Big Rock Rd, Saint Helena, CA?

1451 Big Rock Rd, Saint Helena, CA has 3 bedrooms, 3.5 bathrooms, 4,045 square feet of living space and a 3.15-acre lot.

When was 1451 Big Rock Rd, Saint Helena, CA built?

1451 Big Rock Rd, Saint Helena, CA was built in 1990, making it 36 years old. The building has 2 stories.

What schools serve 1451 Big Rock Rd, Saint Helena, CA?

1451 Big Rock Rd, Saint Helena, CA is assigned to St. Helena High School (high), rated A; Robert Louis Stevenson Intermediate School (middle), rated C; Saint Helena Primary School (elementary). All sit in St. Helena Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 1451 Big Rock Rd, Saint Helena, CA compare to other homes in Saint Helena 94574?

Among the 3,043 homes in Saint Helena 94574, it is worth more than 89% of them ($4,685,074 against a typical $1,691,656), its price per square foot is higher than 75% of them ($1158 against a typical $889), it is bigger than 92% of them (4,045 ft² against a typical 1,878 ft²), its lot is bigger than 82% of them (3.15 ac against a typical 0.28 ac) and it is newer than 76% of them (1990 against a typical 1968). Measured against all of Napa County, it is worth more than 98% 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 1451 Big Rock Rd, Saint Helena, CA?

The 2025 property tax bill for 1451 Big Rock Rd, Saint Helena, CA was $38,224. The county assessed it at $3,600,000.

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