Los Angeles County

    ADU Construction Cost in Los Angeles County (2026): City-by-City Breakdown

    A adu construction in Los Angeles County costs $300–$500 per sq ft, with a typical mid-size ADU running $90k–$180k at the county average. Small projects start around $60k; large or high-end work can reach $450k or more.

    Costs in Los Angeles County track the LA County baseline, shaped by LADBS permit complexity, dense urban logistics, and elevated SoCal trade-labor rates.

    Get Matched See City-by-City Costs
    LA County cost
    $300–$500 per sq ft

    ADU Construction Cost by Size — LA County Average

    County-average ranges (1.00× LA County baseline). Individual cities vary — see the table below.

    SizeTypeRangeLowHigh
    SmallJADU / studio150–400 sq ft$60k$130k
    Medium1-bed garage conversion400–600 sq ft$90k$180k
    LargeDetached 2-bed800–1,200 sq ft$250k$450k

    ADU Construction Cost by City in Los Angeles County

    Every city in Los Angeles County, sorted alphabetically. Totals reflect each city's local cost multiplier. Cities in color have full project-specific pages.

    CitySmallMediumLarge
    Agoura Hills$66k–$143k$99k–$198k$275k–$495k
    Alhambra$56k–$121k$84k–$168k$233k–$419k
    Arcadia$66k–$143k$99k–$198k$275k–$495k
    Azusa$54k–$116k$80k–$160k$223k–$401k
    Baldwin Park$53k–$115k$79k–$159k$220k–$396k
    Bell$52k–$113k$79k–$157k$218k–$392k
    Bellflower$54k–$117k$81k–$162k$225k–$405k
    Beverly Hills$93k–$202k$140k–$279k$388k–$698k
    Burbank$63k–$137k$95k–$189k$263k–$473k
    Carson$55k–$119k$82k–$164k$228k–$410k
    Cerritos$57k–$122k$85k–$169k$235k–$423k
    Claremont$57k–$124k$86k–$171k$238k–$428k
    Commerce$53k–$115k$79k–$159k$220k–$396k
    Compton$53k–$115k$79k–$159k$220k–$396k
    Covina$54k–$117k$81k–$162k$225k–$405k
    Culver City$78k–$169k$117k–$234k$325k–$585k
    Diamond Bar$57k–$122k$85k–$169k$235k–$423k
    Downey$55k–$120k$83k–$166k$230k–$414k
    Duarte$54k–$117k$81k–$162k$225k–$405k
    El Monte$52k–$113k$79k–$157k$218k–$392k
    El Segundo$69k–$150k$104k–$207k$288k–$518k
    Gardena$55k–$120k$83k–$166k$230k–$414k
    Glendale$63k–$137k$95k–$189k$263k–$473k
    Glendora$55k–$120k$83k–$166k$230k–$414k
    Hawthorne$57k–$122k$85k–$169k$235k–$423k
    Hermosa Beach$78k–$169k$117k–$234k$325k–$585k
    Huntington Park$53k–$115k$79k–$159k$220k–$396k
    Inglewood$56k–$121k$84k–$168k$233k–$419k
    La Cañada Flintridge$81k–$176k$122k–$243k$338k–$608k
    La Mirada$54k–$117k$81k–$162k$225k–$405k
    La Puente$52k–$113k$79k–$157k$218k–$392k
    La Verne$56k–$121k$84k–$168k$233k–$419k
    Lakewood$55k–$120k$83k–$166k$230k–$414k
    Lancaster$49k–$107k$74k–$148k$205k–$369k
    Lomita$56k–$121k$84k–$168k$233k–$419k
    Long Beach$57k–$124k$86k–$171k$238k–$428k
    Los Angeles$60k–$130k$90k–$180k$250k–$450k
    Lynwood$53k–$115k$79k–$159k$220k–$396k
    Malibu$93k–$202k$140k–$279k$388k–$698k
    Manhattan Beach$84k–$182k$126k–$252k$350k–$630k
    Maywood$52k–$113k$79k–$157k$218k–$392k
    Monrovia$57k–$124k$86k–$171k$238k–$428k
    Montebello$54k–$117k$81k–$162k$225k–$405k
    Monterey Park$55k–$120k$83k–$166k$230k–$414k
    Norwalk$54k–$116k$80k–$160k$223k–$401k
    Palmdale$49k–$107k$74k–$148k$205k–$369k
    Palos Verdes Estates$81k–$176k$122k–$243k$338k–$608k
    Paramount$53k–$115k$79k–$159k$220k–$396k
    Pasadena$69k–$150k$104k–$207k$288k–$518k
    Pico Rivera$54k–$116k$80k–$160k$223k–$401k
    Pomona$53k–$115k$79k–$159k$220k–$396k
    Rancho Palos Verdes$78k–$169k$117k–$234k$325k–$585k
    Redondo Beach$71k–$154k$106k–$213k$295k–$531k
    Rolling Hills Estates$78k–$169k$117k–$234k$325k–$585k
    Rosemead$54k–$117k$81k–$162k$225k–$405k
    San Dimas$55k–$120k$83k–$166k$230k–$414k
    San Fernando$54k–$117k$81k–$162k$225k–$405k
    San Gabriel$56k–$121k$84k–$168k$233k–$419k
    San Marino$84k–$182k$126k–$252k$350k–$630k
    Santa Clarita$59k–$128k$88k–$177k$245k–$441k
    Santa Fe Springs$54k–$117k$81k–$162k$225k–$405k
    Santa Monica$87k–$189k$131k–$261k$363k–$653k
    Signal Hill$56k–$121k$84k–$168k$233k–$419k
    South El Monte$52k–$113k$79k–$157k$218k–$392k
    South Gate$53k–$115k$79k–$159k$220k–$396k
    South Pasadena$69k–$150k$104k–$207k$288k–$518k
    Temple City$56k–$121k$84k–$168k$233k–$419k
    Torrance$58k–$126k$88k–$175k$243k–$437k
    Walnut$57k–$122k$85k–$169k$235k–$423k
    West Covina$54k–$117k$81k–$162k$225k–$405k
    West Hollywood$84k–$182k$126k–$252k$350k–$630k
    Westlake Village$72k–$156k$108k–$216k$300k–$540k
    Whittier$55k–$119k$82k–$164k$228k–$410k

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    What Affects ADU Construction Cost in Los Angeles County?

    • ADU type (JADU vs attached vs detached).
    • Site prep and grading.
    • Utility connections.
    • CA Title 24 energy compliance.
    • City ADU permit timeline.
    • LA County market dynamics: LADBS permit complexity, dense urban logistics, and elevated SoCal trade-labor rates, keeping adu construction totals close to the LA County baseline.
    • City variation within LA County: coastal and hillside cities can run 15–30% above the county mid-point, while inland labor markets price 10–20% below.

    ADU Construction Sub-Type Comparisons

    Garage Conversion ADU vs Detached ADU

    Garage conversions reuse the existing slab and shell; a detached new-build ADU costs more but unlocks larger floor plans and higher rent.

    Junior ADU (JADU) vs Attached ADU

    A JADU (≤500 sq ft, within the home) shares utilities; an attached ADU is a true second unit with its own entrance and meter.

    How to Get the Best Price on a ADU Construction in Los Angeles County

    1. Get 3 line-itemized bids on the same scope through Keystone Connect — LA County adu construction pricing varies 10–25% between contractors.
    2. Compare bids from contractors based in multiple LA County cities; inland-based crews servicing coastal jobs often beat coastal-based pricing.
    3. Bid in shoulder seasons (Jan–Mar or Sep–Oct) when LA County contractor schedules are open and rush premiums disappear.
    4. Verify CSLB license, insurance, and bond before paying any deposit. California caps deposits at $1,000 or 10% of contract, whichever is less.

    Frequently Asked Questions — ADU Construction in Los Angeles County

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