Los Angeles County

    Room Addition Cost in Los Angeles County (2026): City-by-City Breakdown

    A room addition in Los Angeles County costs $300–$600 per sq ft, with a typical mid-size room addition running $110k–$220k at the county average. Small projects start around $50k; large or high-end work can reach $400k 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–$600 per sq ft

    Room Addition Cost by Size — LA County Average

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

    SizeTypeRangeLowHigh
    SmallBump-out / single room150–250 sq ft$50k$110k
    MediumSuite addition300–500 sq ft$110k$220k
    LargeSecond story / multi-room600+ sq ft$200k$400k

    Room Addition 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$55k–$121k$121k–$242k$220k–$440k
    Alhambra$47k–$103k$103k–$205k$186k–$372k
    Arcadia$55k–$121k$121k–$242k$220k–$440k
    Azusa$45k–$98k$98k–$196k$178k–$356k
    Baldwin Park$44k–$97k$97k–$194k$176k–$352k
    Bell$44k–$96k$96k–$192k$174k–$348k
    Bellflower$45k–$99k$99k–$198k$180k–$360k
    Beverly Hills$78k–$171k$171k–$341k$310k–$620k
    Burbank$53k–$116k$116k–$231k$210k–$420k
    Carson$46k–$100k$100k–$200k$182k–$364k
    Cerritos$47k–$104k$104k–$207k$188k–$376k
    Claremont$48k–$105k$105k–$209k$190k–$380k
    Commerce$44k–$97k$97k–$194k$176k–$352k
    Compton$44k–$97k$97k–$194k$176k–$352k
    Covina$45k–$99k$99k–$198k$180k–$360k
    Culver City$65k–$143k$143k–$286k$260k–$520k
    Diamond Bar$47k–$104k$104k–$207k$188k–$376k
    Downey$46k–$101k$101k–$203k$184k–$368k
    Duarte$45k–$99k$99k–$198k$180k–$360k
    El Monte$44k–$96k$96k–$192k$174k–$348k
    El Segundo$58k–$127k$127k–$253k$230k–$460k
    Gardena$46k–$101k$101k–$203k$184k–$368k
    Glendale$53k–$116k$116k–$231k$210k–$420k
    Glendora$46k–$101k$101k–$203k$184k–$368k
    Hawthorne$47k–$104k$104k–$207k$188k–$376k
    Hermosa Beach$65k–$143k$143k–$286k$260k–$520k
    Huntington Park$44k–$97k$97k–$194k$176k–$352k
    Inglewood$47k–$103k$103k–$205k$186k–$372k
    La Cañada Flintridge$68k–$149k$149k–$297k$270k–$540k
    La Mirada$45k–$99k$99k–$198k$180k–$360k
    La Puente$44k–$96k$96k–$192k$174k–$348k
    La Verne$47k–$103k$103k–$205k$186k–$372k
    Lakewood$46k–$101k$101k–$203k$184k–$368k
    Lancaster$41k–$90k$90k–$181k$164k–$328k
    Lomita$47k–$103k$103k–$205k$186k–$372k
    Long Beach$48k–$105k$105k–$209k$190k–$380k
    Los Angeles$50k–$110k$110k–$220k$200k–$400k
    Lynwood$44k–$97k$97k–$194k$176k–$352k
    Malibu$78k–$171k$171k–$341k$310k–$620k
    Manhattan Beach$70k–$154k$154k–$308k$280k–$560k
    Maywood$44k–$96k$96k–$192k$174k–$348k
    Monrovia$48k–$105k$105k–$209k$190k–$380k
    Montebello$45k–$99k$99k–$198k$180k–$360k
    Monterey Park$46k–$101k$101k–$203k$184k–$368k
    Norwalk$45k–$98k$98k–$196k$178k–$356k
    Palmdale$41k–$90k$90k–$181k$164k–$328k
    Palos Verdes Estates$68k–$149k$149k–$297k$270k–$540k
    Paramount$44k–$97k$97k–$194k$176k–$352k
    Pasadena$58k–$127k$127k–$253k$230k–$460k
    Pico Rivera$45k–$98k$98k–$196k$178k–$356k
    Pomona$44k–$97k$97k–$194k$176k–$352k
    Rancho Palos Verdes$65k–$143k$143k–$286k$260k–$520k
    Redondo Beach$59k–$130k$130k–$260k$236k–$472k
    Rolling Hills Estates$65k–$143k$143k–$286k$260k–$520k
    Rosemead$45k–$99k$99k–$198k$180k–$360k
    San Dimas$46k–$101k$101k–$203k$184k–$368k
    San Fernando$45k–$99k$99k–$198k$180k–$360k
    San Gabriel$47k–$103k$103k–$205k$186k–$372k
    San Marino$70k–$154k$154k–$308k$280k–$560k
    Santa Clarita$49k–$108k$108k–$216k$196k–$392k
    Santa Fe Springs$45k–$99k$99k–$198k$180k–$360k
    Santa Monica$73k–$160k$160k–$319k$290k–$580k
    Signal Hill$47k–$103k$103k–$205k$186k–$372k
    South El Monte$44k–$96k$96k–$192k$174k–$348k
    South Gate$44k–$97k$97k–$194k$176k–$352k
    South Pasadena$58k–$127k$127k–$253k$230k–$460k
    Temple City$47k–$103k$103k–$205k$186k–$372k
    Torrance$49k–$107k$107k–$214k$194k–$388k
    Walnut$47k–$104k$104k–$207k$188k–$376k
    West Covina$45k–$99k$99k–$198k$180k–$360k
    West Hollywood$70k–$154k$154k–$308k$280k–$560k
    Westlake Village$60k–$132k$132k–$264k$240k–$480k
    Whittier$46k–$100k$100k–$200k$182k–$364k

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    What Affects Room Addition Cost in Los Angeles County?

    • Foundation type.
    • Roofline integration.
    • MEP (mechanical/electrical/plumbing) extension.
    • Permits.
    • Soil condition.
    • LA County market dynamics: LADBS permit complexity, dense urban logistics, and elevated SoCal trade-labor rates, keeping room addition 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.

    Room Addition Sub-Type Comparisons

    Bedroom Addition vs Master Suite Addition

    A standard bedroom addition is the lowest scope; a master suite (bedroom + bath + walk-in closet) roughly doubles the plumbing scope and total.

    Second Story Addition vs Sunroom Addition

    Second-story additions require foundation reinforcement and full re-roof; sunrooms (prefab or stick-built) skip much of the structural work.

    How to Get the Best Price on a Room Addition in Los Angeles County

    1. Get 3 line-itemized bids on the same scope through Keystone Connect — LA County room addition 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 — Room Addition in Los Angeles County

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