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Single Family ResidenceResidential
$1,221,928$483 / 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 93How 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 $725,000 on Jan 12, 2015

21730 LOS ALIMOS ST

CHATSWORTH, CA 91311
4
Beds
3
Baths
2,532 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.
0.4 ac
Lot SizeThe size of the land the home sits on, from county records.
1978
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
13
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$1.2M
$1.1M low$1.3M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$725,000 · Jan 12, 2015

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$10,871 (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.$888,756 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$509,471
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$379,285
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$871,331

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.6 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.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.Conventional
CountyLOS ANGELES
Lot (acres)The size of the land the home sits on, from county records.0.40
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Wood Shingle
HeatingThe type of heating system in the home.Floor/Wall Furnace
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, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.Yes

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
Chatsworth Park Elementary SchoolA-
Elementary · Grades KG–5 · 0.5 mi
M
Ernest Lawrence Middle SchoolB-
Middle · Grades 6–8 · 1.0 mi
H
Chatsworth Charter High SchoolB-
High · Grades 9–12 · 1.4 mi

District: Los Angeles Unified School District

Neighborhood · ZIP 91311These 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.71
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.110
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.542

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.29%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.2%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.8%
PopulationHow many people live in this area.39,425
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,548 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$107,306
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$137,663
Average tempThe average temperature here across a full year.63°F
Annual precipHow much rain and melted snow falls here in a typical year.20 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.73%

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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

21730 Los Alimos St 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 77% of homes in Chatsworth 91311
  • Costs less per square foot than 73% of homes in Los Angeles County
  • Bigger than 83% of homes in Los Angeles County
  • Has a bigger lot than 81% of homes in Los Angeles County
  • Newer than 74% of homes in Los Angeles County

What homes are worth in Chatsworth 91311

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

This home
$467K$2.6M

This home is worth more than 77% of homes in Chatsworth 91311.

How it measures up in Chatsworth 91311

The dot is this home. The mark in the middle is the typical home in Chatsworth 91311.

Estimated value$1,221,928
CheaperTypical $917,889Pricier

Pricier than 77% of homes nearby

Price per ft²$483
CheaperTypical $467Pricier

Pricier than 56% of homes nearby

Living area2,532 ft²
SmallerTypical 1,875 ft²Bigger

Bigger than 75% of homes nearby

Lot size0.4 ac
SmallerTypical 0.28 acBigger

Bigger than 59% of homes nearby

Year built1978
OlderTypical 1974Newer

Newer than 67% of homes nearby

How 21730 Los Alimos St ranks against every home in each area.
MeasureThis homeChatsworthChatsworth 91311Los Angeles County
Estimated valuepricier than$1,221,92866% of homes77% of homes75% of homes
Price per ft²pricier than$48353% of homes56% of homes27% of homes
Living areabigger than2,532 ft²66% of homes75% of homes83% of homes
Lot sizebigger than0.4 ac60% of homes59% of homes81% of homes
Year builtnewer than197855% of homes67% of homes74% of homes

About 21730 Los Alimos St

How much is 21730 Los Alimos St, Chatsworth, CA worth?

The TopHap Estimate for 21730 Los Alimos St, Chatsworth, CA is $1,221,928 as of Sep 24, 2026. The likely range is $1,135,669 to $1,308,187. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21730 Los Alimos St, Chatsworth, CA last sell?

21730 Los Alimos St, Chatsworth, CA last sold on Jan 12, 2015 for $725,000, according to the county's recorded deed.

How big is 21730 Los Alimos St, Chatsworth, CA?

21730 Los Alimos St, Chatsworth, CA has 4 bedrooms, 3 bathrooms, 2,532 square feet of living space and a 0.40-acre lot.

When was 21730 Los Alimos St, Chatsworth, CA built?

21730 Los Alimos St, Chatsworth, CA was built in 1978, making it 48 years old. It is a conventional home. The building has 1 story.

What schools serve 21730 Los Alimos St, Chatsworth, CA?

21730 Los Alimos St, Chatsworth, CA is assigned to Chatsworth Park Elementary School (elementary), rated A-; Ernest Lawrence Middle School (middle), rated B-; Chatsworth Charter High School (high), rated B-. All sit in Los Angeles Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21730 Los Alimos St, Chatsworth, CA compare to other homes in Chatsworth 91311?

Among the 11,364 homes in Chatsworth 91311, it is worth more than 77% of them ($1,221,928 against a typical $917,889), its price per square foot is higher than 56% of them ($483 against a typical $467), it is bigger than 75% of them (2,532 ft² against a typical 1,875 ft²), its lot is bigger than 59% of them (0.4 ac against a typical 0.28 ac) and it is newer than 67% of them (1978 against a typical 1974). Measured against all of Los Angeles County, it is worth more than 75% 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 21730 Los Alimos St, Chatsworth, CA?

The 2025 property tax bill for 21730 Los Alimos St, Chatsworth, CA was $10,871. The county assessed it at $888,756.

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