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Single Family ResidenceResidential
$2,251,965$641 / 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 95How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026
Last sold for $1,044,000 on May 14, 2009

3921 ALDER AVE

CARLSBAD, CA 92008
5
Beds
4.5
Baths
3,511 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.
0.5 ac
Lot SizeThe size of the land the home sits on, from county records.
1975
Year BuiltThe year the home was originally built, according to county records.
5
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$2.3M
$2.1M low$2.4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,044,000 · May 14, 2009

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$16,047 (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.$1,514,831 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$919,457
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$595,374
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,485,129

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.41
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
79
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
23
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
13
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
89
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.

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
CountySAN DIEGO
Lot (acres)The size of the land the home sits on, from county records.0.50
GarageWhether the property has a garage, and details like whether it is attached to the home.Carport (Unspecified)
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(10)

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
Magnolia Elementary SchoolA+
Elementary · Grades KG–5 · 0.3 mi
M
Valley Middle SchoolA-
Middle · Grades 6–8 · 0.4 mi
H
Carlsbad High SchoolA-
High · Grades 9–12 · 0.5 mi

District: Carlsbad Unified School District

Neighborhood · ZIP 92008These 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.112
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.102
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.281

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.33%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.7%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.28,480
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,412 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$111,166
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$138,895
Average tempThe average temperature here across a full year.61°F
Annual precipHow much rain and melted snow falls here in a typical year.12 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.68%

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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

3921 Alder Ave 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 93% of homes in San Diego County
  • Costs less per square foot than 81% of homes in Olde Carlsbad
  • Among the largest homes in Carlsbad 92008
  • Has a bigger lot than 89% of homes in Carlsbad 92008
  • Older than 95% of homes in Carlsbad 92008

What homes are worth in Carlsbad 92008

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

This home
$537K$4M

This home is worth more than 85% of homes in Carlsbad 92008.

How it measures up in Carlsbad 92008

The dot is this home. The mark in the middle is the typical home in Carlsbad 92008.

Estimated value$2,251,965
CheaperTypical $1,549,742Pricier

Pricier than 85% of homes nearby

Price per ft²$641
CheaperTypical $791Pricier

Pricier than 20% of homes nearby

Living area3,511 ft²
SmallerTypical 781 ft²Bigger

Bigger than almost all homes nearby

Lot size0.5 ac
SmallerTypical 1,525 ft²Bigger

Bigger than 89% of homes nearby

Year built1975
OlderTypical 2008Newer

Newer than 5% of homes nearby

How 3921 Alder Ave ranks against every home in each area.
MeasureThis homeOlde CarlsbadCarlsbad 92008San Diego County
Estimated valuepricier than$2,251,96586% of homes85% of homes93% of homes
Price per ft²pricier than$64119% of homes20% of homes66% of homes
Living areabigger than3,511 ft²97% of homesalmost all homes95% of homes
Lot sizebigger than0.5 ac71% of homes89% of homes62% of homes
Year builtnewer than197516% of homes5% of homes33% of homes

About 3921 Alder Ave

How much is 3921 Alder Ave, Carlsbad, CA worth?

The TopHap Estimate for 3921 Alder Ave, Carlsbad, CA is $2,251,965 as of Oct 21, 2026. The likely range is $2,132,021 to $2,371,909. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 3921 Alder Ave, Carlsbad, CA last sell?

3921 Alder Ave, Carlsbad, CA last sold on May 14, 2009 for $1,044,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 3921 Alder Ave, Carlsbad, CA?

3921 Alder Ave, Carlsbad, CA has 5 bedrooms, 4.5 bathrooms, 3,511 square feet of living space and a 0.50-acre lot.

When was 3921 Alder Ave, Carlsbad, CA built?

3921 Alder Ave, Carlsbad, CA was built in 1975, making it 51 years old.

What schools serve 3921 Alder Ave, Carlsbad, CA?

3921 Alder Ave, Carlsbad, CA is assigned to Magnolia Elementary School (elementary), rated A+; Valley Middle School (middle), rated A-; Carlsbad High School (high), rated A-. All sit in Carlsbad Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 3921 Alder Ave, Carlsbad, CA compare to other homes in Carlsbad 92008?

Among the 63,805 homes in Carlsbad 92008, it is worth more than 85% of them ($2,251,965 against a typical $1,549,742), its price per square foot is higher than 20% of them ($641 against a typical $791), it is bigger than almost all of them (3,511 ft² against a typical 781 ft²), its lot is bigger than 89% of them (0.5 ac against a typical 1,525 ft²) and it is newer than 5% of them (1975 against a typical 2008). Measured against all of San Diego County, it is worth more than 93% 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 3921 Alder Ave, Carlsbad, CA?

The 2025 property tax bill for 3921 Alder Ave, Carlsbad, CA was $16,047. The county assessed it at $1,514,831.

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Assigned schools

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