Sonoma County, CA Duplexes for Sale

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Updated: Jul 18

Ranch-Style Duplex with Detached Unit

4941 Hansen Drive, Santa Rosa, CA 95409

$925,000

2,246 sqft 0.41 AC lot

Two dwellings on a 0.4063‑acre lot: approximately 1,466 sq. ft. main home and approximately 650 sq. ft. detached unit
Officially zoned as a Duplex
Primary residence offers 3 bedrooms and 2 full bathrooms; rear dwelling includes 2 bedrooms
Detached unit has a newer mini‑split system and a sub‑meter for electricity usage
Private well with UV filtration system and connection to City sewer

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Updated: Aug 28

Duplex with Two Detached Homes

476 Sonoma Avenue, Santa Rosa, CA 95401

$850,000

2,345 sqft 0.13 AC lot

Two separate homes totaling 2,345 square feet
0.1258‑acre lot with covered and on‑street parking
Front home includes 4 bedrooms and 2 bathrooms
Rear home includes 2 bedrooms, 1 bathroom, deck, and hot tub
Separate laundry rooms with washers and dryers

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Two-Unit Duplex with Garages

8005 Trenton Court, Forestville, CA 95436

$649,000

2,236 sqft 0.09 AC lot

Two separate residences offer three-bedroom layouts, private yards, indoor laundry hookups, and individual garages.

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See what stands out in Sonoma County

We check every for-sale listing in the county against comparable properties across the country. Most price about where you would expect. A few are worth a second look.

We check every listing here. A few are worth a second look.

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Remodeled Duplex with Accessory Structure

17090 Sonoma Highway, Sonoma, CA 95476

$969,000

2,650 sqft 0.17 AC lot

Two separate residences feature updated kitchens, remodeled bathrooms, and flexible outdoor space.

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Remodeled Duplex with ADU

1524 Fair Oaks Court, Santa Rosa, CA 95404

$1,325,000

2,552 sqft 0.43 AC lot

Two residences plus flexible studio space offer adaptable living, workspace, and guest accommodation options.

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Duplex Property with Deck

16352 5th Street, Guerneville, CA 95446

$399,900

1,530 sqft 0.04 AC lot

Upper-level living spaces feature recent bathroom, paint, and appliance updates, while the lower level awaits completion.

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Renovated River-View Duplex

21498 Starrett Hill Road, Monte Rio, CA 95462

$525,000

1,230 sqft 0.10 AC lot

Two-unit property with contemporary interiors, a private deck, and walkable access to Monte Rio restaurants, theater, and beach.

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Renovated River-View Duplex

21498 Starrett Hill Dr, Monte Rio, CA

$525,000

1,230 sqft

Updated duplex with contemporary interiors, private deck, and walkable access to Monte Rio’s restaurants, theater, and public beach.

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Duplex With Two Detached Homes

227 Hewett Street, Santa Rosa, CA 95401

$719,900

1,650 sqft

Two separate residences share a fenced corner lot near DeMeo Park, Railroad Square, and the Smart Train station.

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Refurbished Duplex with Rear Yards

509 Fitch St, Healdsburg, CA 95448

$1,199,500

2,192 sqft

Healdsburg duplex with private-driveway access and separate rear yards offering space for gardening.

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Detached Cottages Income Property

18343 Lucas Avenue, Sonoma, CA 95476

$798,000

1,565 sqft

Two detached cottages on one parcel each have private yards, carports, and dedicated storage for separate living or rental income.

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Creekside Duplex with Two Cabins

5465 Cazadero Highway, Cazadero, CA 95421

$410,000

1,032 sqft

Two cabins share a landscaped creekside setting with parking, redwood surroundings, and outdoor gathering areas.

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Two-Home Duplex Property

19322 Quigley Lane, Sonoma, CA 95476

$1,165,000

1,996 sqft

Income-producing Sonoma property with two separate residences, covered parking, and outdoor improvements.

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Hilltop Duplex with Three-Bay Shop

741 N Webster Street, Petaluma, CA 94952

$1,999,000

0.84 AC lot

Two residences include remodeled interiors, private outdoor areas, and substantial garage and workshop space.

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Duplex with Legal Studio

1782 Hoen Avenue, Santa Rosa, CA 95405

$769,000

1,751 sqft

Two-house lot combines a three-bedroom residence with a separate legal studio and substantial on-site parking.

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Mixed-Use Property With Detached Duplex

453 2nd Street, Sonoma, CA 95476

$1,400,000

Commercial workspace and residential units create an owner-user configuration with one tenant in place on a month-to-month arrangement.

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Duplex with Attached Granny Unit

8130 Park Ave, Forestville, CA 95436

$657,000

Two attached living units offer a two-bedroom upper layout and a one-bedroom lower granny unit.

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Updated Duplex with Separate Second Home

Santa Rosa, CA 95403

$900,000

Includes a three-bedroom main residence and a one-bedroom second home with distinct living spaces.

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Updated Duplex with Detached ADU

1109 Saint Vincent Court, Petaluma, CA 94954

$1,200,000

Two separate residences provide flexible living arrangements with independent utilities and a permitted accessory dwelling unit.

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Mixed-Use Property with Salon

17 Mountain Ave, Sonoma, CA 95476

Contact for pricing

2,970 sqft 0.22 AC lot

Signalized-corner asset combining an operating salon, two residential units, off-street parking, and a Japanese-style garden.

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Two-Home Duplex Property

375 Florence Avenue, Sebastopol, CA 95472

$1,195,000

Separate residences offer three-bedroom layouts, private positioning, and a two-car garage.

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Renovated Two-Unit Duplex

Santa Rosa, CA 95401

$717,500

Side-by-side residences offer separate meters, attached garages, dedicated parking, and laundry hookups.

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Freestanding Retail with Apartments

18590 HIGHWAY 12 SONOMA, Sonoma, CA 95476

Contact for pricing

4,315 sqft 0.27 AC lot

New two-story freestanding building combines ground-floor multi-tenant retail with two apartment units above.

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Mediterranean Duplex with Attached ADU

Santa Rosa, CA 95407

$850,000

Updated two-residence layout includes private ADU access and central air.

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Sonoma County, CA Duplexes Market Trends and Statistics

Explore 29 duplexes for sale in Sonoma County, CA, showcased through 29 active listings on our real estate platform. These investment opportunities span a total of 35,698 square feet of properties for sale, with an estimated market value of $20,147,800.

Sale prices for duplexes in Sonoma County, CA start at $399,900, averaging $915,809, and reaching up to $1,999,000 — 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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