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    San Mateo County, CA Duplexes for Sale

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    Two-Unit Residential Duplex
    Updated: Sep 25
    Two-Unit Residential Duplex

    1440 Valota RD, Redwood City, CA 94061

    $1,500,000
    1,620 sqft 0.21 AC lot
    Two residences, each with 2 bedrooms and 1 bathroom
    1,620‑square‑foot building on a 9,172‑square‑foot lot
    Each unit has laundry hookups and a private 1‑car garage
    Rear unit includes a deck and fenced backyard
    Front unit features refinished hardwood floors and an updated bathroom
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    Duplex with Legal ADU
    Updated: Oct 3
    Duplex with Legal ADU

    224-224A Dwight Street, San Francisco, CA 94134

    $1,400,000
    2,066 sqft 0.05 AC lot
    Duplex with a three‑bedroom, two‑bath main residence and legal one‑bedroom ADU
    2,066 square feet of building area on a 0.0516‑acre lot
    Three decks totaling 552 square feet
    Updated electrical and plumbing systems completed with city permits
    Main residence available for immediate occupancy
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    Remodeled Coastal Duplex
    Remodeled Coastal Duplex

    Cypress AVE, Moss Beach, CA 94038

    $1,198,888
    1,190 sqft 0.13 AC lot

    Two residential units offer flexible occupancy, rental, or extended-family use near Moss Beach’s coastal amenities.

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    Two-Unit Duplex with Garage
    Two-Unit Duplex with Garage

    2700-2702 Diamond ST, San Francisco, CA 94131

    $1,795,000
    2,094 sqft

    Two separate residences offer private outdoor access, in-unit laundry, and a shared side-by-side garage.

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    Victorian Duplex with Private Outdoor Spaces
    Victorian Duplex with Private Outdoor Spaces

    4380 24th ST, San Francisco, CA 94114

    $2,498,000
    1,760 sqft 0.04 AC lot

    Two tenant-occupied residences offer distinct layouts, private outdoor areas, and in-unit laundry.

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    Two-Unit Duplex with Backyard
    Two-Unit Duplex with Backyard

    646-648 Madrid Street, San Francisco, CA 94112

    $1,150,000
    1,400 sqft 0.06 AC lot

    San Francisco duplex with two residential units, basement storage, and access to shops, restaurants, transportation, and a playground.

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    Three-Level Victorian Duplex Property
    Three-Level Victorian Duplex Property

    271 Austin ST, San Francisco, CA 94109

    $1,499,999
    2,721 sqft 0.03 AC lot

    Vacant property with NC3 zoning and an existing office configuration across three levels.

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    Duplex With Attached Garages
    Duplex With Attached Garages

    143145 N N. Humboldt Street, San Mateo, CA 94401

    $1,780,000
    4,008 sqft

    Two attached garages and private driveway parking support the property’s two-unit residential configuration.

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    Duplex with Vacant Unit
    Duplex with Vacant Unit

    954 De Haro Street, San Francisco, CA 94107

    $2,500,000
    3,074 sqft 0.06 AC lot

    One residence is vacant, while the other unit and a separate garage are leased.

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    Duplex with In-Law Unit
    Duplex with In-Law Unit

    15 -17 Harriet ST, San Francisco, CA 94103

    $1,249,000
    2,700 sqft 0.03 AC lot

    Both primary residences are vacant and have updated kitchens.

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    Duplex with Two Attached Garages
    Duplex with Two Attached Garages

    109 Hobart Ave, San Mateo, CA 94402

    $2,450,000
    3,686 sqft 0.20 AC lot

    Renovation-ready 1948 duplex with three-bedroom layouts, separate utility metering, and two attached garages.

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    Edwardian Duplex with ADU Permits
    Edwardian Duplex with ADU Permits

    3323-3325 26th Street, San Francisco, CA 94110

    $1,695,000
    2,870 sqft 0.07 AC lot

    Two separate flats offer three-bedroom layouts, central heating, storage, and access to a lower-level expansion area.

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    Mixed-Use Building with Mezzanine
    Mixed-Use Building with Mezzanine

    1226 Stockton Street, San Francisco, CA 94133

    $3,000,000
    6,576 sqft 0.04 AC lot

    Includes two remodeled, vacant residential units above commercial space.

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    Two-Unit Duplex with Spacious Residences
    Two-Unit Duplex with Spacious Residences

    341 Dumbarton AVE, Redwood City, CA 94063

    $1,599,800
    3,086 sqft 0.11 AC lot

    Well-maintained duplex with house-like layouts, modern finishes, central heating, and convenient parking in Redwood City.

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    Duplex With Private Balcony
    Duplex With Private Balcony

    991 Mills AVE, San Bruno, CA 94066

    $950,000
    1,052 sqft 0.06 AC lot

    Two-unit property with a two-bedroom upper residence, studio lower unit, shared laundry, and backyard space.

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    Duplex with Private Garden
    Duplex with Private Garden

    3633-3635 16th Street, San Francisco, CA 94114

    $2,498,000
    2,964 sqft 0.04 AC lot

    Both residences have renovated kitchens and bathrooms, with a substantial garage and a south-facing outdoor area.

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    Two-Unit Duplex Property
    Two-Unit Duplex Property

    83-85 Stanyan St, San Francisco, CA 94118

    $1,997,000
    2,559 sqft

    Two residences provide renovation flexibility for rental use, owner occupancy, or a customized residential plan.

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    Duplex with Rooftop Deck
    Duplex with Rooftop Deck

    312 Lombard ST, San Francisco, CA 94133

    $3,850,000
    2,762 sqft 0.04 AC lot

    Two residential levels offer distinct kitchen and living spaces, while the rooftop deck faces the bay and Golden Gate Bridge.

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    Remodeled Duplex with Studio
    Remodeled Duplex with Studio

    1619 Laguna Street, San Francisco, CA 94115

    $2,999,999
    3,124 sqft

    Flexible two-unit configuration includes a private-entry studio suited to guests, office use, or rental occupancy.

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    Vacant Duplex with Private Deck
    Vacant Duplex with Private Deck

    2109 22nd St, San Francisco, CA 94107

    $850,000
    752 sqft 0.04 AC lot

    Two compact residences provide separate living areas, outdoor space, and a flexible configuration in Potrero Hill.

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    Brick Duplex with Garage
    Brick Duplex with Garage

    1355 Grove Street, San Francisco, CA 94117

    $2,800,000
    5,710 sqft

    Two residences share a substantial garage space, with private outdoor areas serving both homes.

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    Balboa Street Mixed-Use Building
    Balboa Street Mixed-Use Building

    558-560 Balboa St, San Francisco, CA 94118

    $1,925,000
    1,980 sqft 0.04 AC lot

    Two-level property combines a street-facing restaurant with a private three-bedroom residence and separate entry.

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    Two-Bedroom Duplex Investment Property
    Two-Bedroom Duplex Investment Property

    4 Warren Rd, San Mateo, CA 94401

    $2,280,000
    3,450 sqft 0.16 AC lot

    Duplex with two-bedroom floor plans near downtown amenities and regional transportation connections.

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    Tenant-Occupied Triplex with Garage
    Tenant-Occupied Triplex with Garage

    1545-1547 Balboa Street, San Francisco, CA 94118

    $1,950,000
    2,850 sqft 0.06 AC lot

    Inner Richmond multifamily property with three residential units and an attached garage.

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    San Mateo County, CA Duplexes Market Trends and Statistics

    Explore 135 duplexes for sale in San Mateo County, CA, showcased through 135 active listings on our real estate platform. These investment opportunities span a total of 215,340 square feet of properties for sale, with an estimated market value of $267,972,261.

    Sale prices for two-family homes in San Mateo County, CA start at $514,900, averaging $2,061,325, and reaching up to $19,500,000 — offering options for a variety of budgets and business needs. Daily updated analytics ensure you stay ahead with the latest data and market trends.

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    Featured San Mateo County Real Estate Agencies

    Realmo connects you with licensed San Mateo County CRE brokers providing property specifications, local market pricing, and commercial transaction underwriting support.

    Keller Williams Peninsula Estates
    1430 Howard Avenue Burlingame, CA 94010
    Phone: 16506273700
    www.KWPeninsulaEstates.com
    Re/Max Prestigious Properties
    2811 14th Ave San Francisco, CA 94127
    Phone: 14155643776
    prestigiousproperties11.california.remax.com/
    Capital Realty Group
    1200 Howard Avenue Suite 204 Burlingame, CA 94010
    Phone: 16503420373
    www.capitalrealtygrp.com
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