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    Whatcom County, WA Duplexes for Sale

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    19 properties
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    Duplex with Attached ADU
    Updated: Oct 23
    Duplex with Attached ADU

    4295 King Avenue, Bellingham, WA 98226

    $790,000
    1,838 sqft 0.25 AC lot
    Two residences: 3‑bedroom, 2‑bath main home and attached 1‑bedroom, 1‑bath ADU
    Main home measures 1,300 sq ft; attached ADU measures 512 sq ft
    38‑panel solar system and electric vehicle charger
    Quarter‑acre lot with a newly completed deck and fully fenced backyard
    Built in 2019; septic system and crawl‑space storage
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    New Construction Duplex with Garages
    Updated: Sep 1
    New Construction Duplex with Garages

    110 Baker Street # A & B, Everson, WA 98247

    $849,500
    3,388 sqft
    New construction completed in 2025
    Two 1,694‑square‑foot units; 3,388 square feet combined
    Each unit has 3 bedrooms, 2.5 baths, and a flexible upper‑level loft or bonus room
    Quartz countertops, stainless steel appliances, and luxury vinyl plank flooring
    Three mini‑split systems per unit provide AC and heat
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    Two-Story Duplex with Private Patios
    Two-Story Duplex with Private Patios

    2828 2830 Valencia St, Bellingham, WA 98226

    $660,000
    2,176 sqft

    Each residence features two bedrooms, two bathrooms, covered parking, and dedicated outdoor space.

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    Duplex With Detached Garage
    Duplex With Detached Garage

    1405 Halleck St, Bellingham, WA 98225

    $710,000
    2,179 sqft 0.11 AC lot

    Two residences offer four-bedroom and two-bedroom layouts, with one bath in each unit.

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    Two-Story Duplex with Covered Parking
    Two-Story Duplex with Covered Parking

    2818 Valencia St 2816, Bellingham, WA 98226

    $625,000
    2,216 sqft

    Both residences include private outdoor space and dedicated laundry utility rooms.

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    Duplex with Remodeled Unit
    Duplex with Remodeled Unit

    401 N 9th Street A & B, Lynden, WA 98264

    $785,000
    2,892 sqft

    Two three-bedroom residences offer open living areas, in-unit laundry, storage, and private outdoor space.

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    Duplex with Private Baths
    Duplex with Private Baths

    1406 Franklin, Bellingham, WA 98225

    $950,000
    3,455 sqft

    Fully occupied duplex with two residential sides, in-unit laundry, private bathrooms, and off-street parking.

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    Renovated Duplex with Townhouse Units
    Renovated Duplex with Townhouse Units

    1100 23RD, Bellingham, WA 98225

    $849,000
    1,848 sqft

    Two fully renovated units feature covered decks, quartz countertops, fireplaces, and in-unit laundry.

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    Duplex with Separate ADU
    Duplex with Separate ADU

    1205 Mcleod, Bellingham, WA 98226

    $1,100,000
    2,895 sqft

    Modern duplex with flexible living arrangements, attached parking, and a separately entered accessory dwelling unit.

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    Occupied Two-Unit Duplex
    Occupied Two-Unit Duplex

    2210 Wilson Ave, Bellingham, WA 98225

    $660,000
    2,272 sqft

    Two tenant-occupied residences include private outdoor areas, in-unit laundry, storage, and separate parking.

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    Mobile Home Park with Duplex
    Mobile Home Park with Duplex

    2625 W Maplewood Ave, Bellingham, WA 98225

    $1,690,000
    1,596 sqft

    The property pairs park-owned homes and resident-leased sites with a duplex containing two leased apartments.

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    Duplex with Attached Garages
    Duplex with Attached Garages

    517 Colton, Everson, WA 98247

    $865,000
    2,994 sqft

    Two contemporary residences offer open layouts, upgraded finishes, and private fenced outdoor areas.

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    Duplex with Two-Car Garages
    Duplex with Two-Car Garages

    2316 Xenia St, Bellingham, WA 98229

    $795,000
    2,470 sqft

    Two residential units each provide three bedrooms, two bathrooms, and a two-car garage.

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    Duplex with Three-Bay Shop
    Duplex with Three-Bay Shop

    7380 Woodland, Ferndale, WA 98248

    $895,000
    2,722 sqft

    Single-story primary home with a two-bedroom, two-bath accessory dwelling unit and multiple outdoor improvements.

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    Duplex with Bay Views
    Duplex with Bay Views

    630 Blvd, Bellingham, WA 98225

    $700,000
    2,060 sqft

    Each residence has two bedrooms, one bathroom, and a dedicated carport space; one provides stair-free access at the main level.

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    Duplex with Private Patio
    Duplex with Private Patio

    2744 Mountain View Rd Unit B, Ferndale, WA 98248

    $749,999
    1,960 sqft

    The two-unit layout supports leasing both residences or living in one while renting the other.

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    Multi-Family
    Multi-Family

    151 Bay Lyn Dr, Lynden, WA 98264

    $1,149,000
    2,804 sqft

    Duplexes · 2,804 SF

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    Duplex Property Assembly
    Duplex Property Assembly

    610 Mead, Everson, WA 98247

    $3,871,669
    1.49 AC lot

    Multi-building residential income property with renovated units, newer construction, garages, and dedicated parking.

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    Duplex with One-Bedroom ADU
    Duplex with One-Bedroom ADU

    3216 Edwards Street, Bellingham, WA 98229

    $900,000

    Two residences include an updated main home and a zero-step-entry accessory dwelling unit.

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    Based on your search, we've compiled Potential Opportunities for your consideration. Besides 19 Active Listings in Whatcom County, WA

    Whatcom County, WA Duplexes Market Trends and Statistics

    Explore 19 duplexes for sale in Whatcom County, WA, showcased through 19 active listings on our real estate platform. These investment opportunities span a total of 41,765 square feet of properties for sale, with an estimated market value of $19,594,168.

    Sale prices for two-family homes in Whatcom County, WA start at $625,000, averaging $1,031,272, and reaching up to $3,871,669 — 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 Whatcom County Real Estate Agencies

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

    National Real Estate Point Roberts
    1385 Gulf Road Point Roberts, WA
    Phone: (360) 945-1011
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