Middlesex County, NJ Duplexes for sale

Updated: Sep 14

Renovated Duplex with Separate ADU

309 S 2nd Avenue S, Highland Park, NJ 08904

$899,000

2,292 sqft 0.19 AC lot

2,292 square feet on a 0.1882‑acre lot
Main residence offers 4 bedrooms and 2 baths
Separate ADU includes 1 bedroom, 1 bath, and its own kitchen
Renovated kitchens and bathrooms in both living spaces
Full basement with interior and exterior access

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Updated: Oct 9

Duplex with Finished Attic

1615 Harvard Avenue, Highland Park, NJ 08904

$800,000

1,992 sqft 0.11 AC lot

Two apartments, each with 2 bedrooms and 1 full bathroom
1,992‑square‑foot building on a 0.1148‑acre corner lot
Finished attic in the second‑floor apartment
Full basement includes a bathroom
Two separate driveways, enclosed porch, and storage shed

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Side-by-Side Duplex

13-15 Haag Street, Sayreville, NJ 08872

$749,900

2,304 sqft 0.12 AC lot

Both residences are tenant-occupied and feature refreshed kitchens and flooring.

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Commercial Land with Existing Home

956 State Route 33 E, Monroe, NJ 08831

$1,600,000

2,318 sqft

Highway Development zoning accompanies an existing two-family home along the Route 33 corridor.

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Duplex with Separate Systems

482 Rahway Avenue, Woodbridge, NJ 07095

$669,900

2,462 sqft 0.11 AC lot

Legal two-family property with matching three-bedroom apartments and individual utility systems.

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Brick Duplex with Deck

16 Somerset Street, Carteret, NJ 07008

$699,900

1,842 sqft 0.10 AC lot

Two residential units offer separate kitchens, living rooms, and one-bedroom configurations for flexible occupancy.

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Duplex with Finished Walk-Up Attic

40 Throop Avenue, New Brunswick, NJ 08901

$625,000

2,594 sqft 0.05 AC lot

Two residential units offer hardwood flooring, full appliance packages, and access to shared basement storage.

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Two-Unit Duplex with Water Views

275 Laurence Pkwy, South Amboy, NJ 08879

$575,000

1,120 sqft

Two apartments include one two-bedroom unit and one three-bedroom unit.

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Renovated Duplex with Two Units

27 Alexander St, New Brunswick, NJ 08901

$549,000

1,760 sqft 0.06 AC lot

Two-unit property with separate gas and electric utilities, updated first-floor kitchen, basement storage, and public water and sewer.

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Renovated Duplex with Private Basements

28 VICTORIA Avenue, Spotswood, NJ 08884

$819,000

2,152 sqft 0.23 AC lot

Two three-bedroom units offer separate utilities, laundry areas, driveways, and private yard space.

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Side-by-Side Duplex

1315 13-15 Haag St, Sayreville, NJ 08872

$749,900

2,304 sqft

Both residences are tenant-occupied and feature updated kitchens and flooring.

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Updated Two-Unit Duplex

331 Watson Avenue, Perth Amboy, NJ 08861

$525,000

1,200 sqft 0.04 AC lot

Brick residential income property with separate meters, central air, porches, and a fenced yard.

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Updated Duplex with Central Air

331 Watson Ave, Perth Amboy, NJ 08861

$525,000

1,650 sqft 0.04 AC lot

Two-story duplex with separate metering, an open porch, and a fenced yard.

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Renovated Duplex With Separate Utilities

27 Alexander St, New Brunswick, NJ 08901

$549,000

1,760 sqft

Legal two-family property with separate gas and electric utilities for each unit.

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Duplex with Finished Basement

35 Lavern Street, Sayreville, NJ 08872

$675,000

1,440 sqft 0.15 AC lot

Both residences offer two bedrooms and one full bathroom, with a finished basement adding a separate full bathroom.

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Two-Unit Duplex with Garage

44 N Whittier Street N, Carteret, NJ 07008

$849,999

3,000 sqft 0.11 AC lot

Each residence offers three bedrooms, two full bathrooms, central air conditioning, and forced-air heating.

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Two-Family Duplex with Private Yard

27 Thomas St, South River, NJ 08882

$580,000

1,615 sqft

Two residential units with separate outdoor access and a newly constructed two-car garage on a fully fenced lot.

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Two-Unit Duplex

382 Stanford Street, Perth Amboy, NJ 08861

$639,900

1,744 sqft 0.05 AC lot

Each residence has two bedrooms, a full bath, and separate kitchen and living areas.

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Side-by-Side Duplex with Basements

11 Mayfield Pl, Metuchen, NJ 08840

$1,099,000

1,680 sqft

Two residential units offer private basements, driveways, and fenced backyards.

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Two-Unit Duplex with Finished Attic

686 Charles Street, Perth Amboy, NJ 08862

$675,000

2,262 sqft 0.09 AC lot

Two separate units, finished attic space, and outdoor area support flexible residential income use.

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Updated Duplex with Garage

32 Avenel St, Avenel, NJ 07001

$659,900

1,514 sqft

Two-family property with separate utilities, heated outdoor living space, and substantial off-street parking.

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Mixed-Use Property with Office Space

1800 N State Route 35 Road, South Amboy, NJ 08879

$899,000

1,723 sqft 0.19 AC lot

Two-family configuration with separate office space, large parking areas, and B3 zoning.

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Duplex with Three-Car Attached Garage

55 Smith St, Perth Amboy, NJ 08861

$699,999

2,302 sqft

Two residential units offer flexible layouts, private outdoor spaces, central air, and separate utility metering.

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Renovated Two-Family Home

31 Edwin Street, Carteret, NJ 07008

$720,000

1,736 sqft 0.11 AC lot

Two separate residences include updated finishes, a tenant-occupied upper unit, and fenced outdoor space.

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Middlesex County, NJ Duplexes Market Trends and Statistics

Explore 108 duplexes for sale in Middlesex County, NJ, showcased through 108 active listings on our real estate platform. These investment opportunities span a total of 133,859 square feet of properties for sale, with an estimated market value of $74,349,891.

Sale prices for two-family homes in Middlesex County, NJ start at $349,000, averaging $688,424, and reaching up to $1,600,000 — offering options for a variety of budgets and business needs. Daily updated analytics ensure you stay ahead with the latest data and market trends.

Featured Middlesex County Real Estate Agencies

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

J J Elek Realty

117 Main Street Woodbridge, NJ 07095

Phone: 17326349100

www.jjelekrealty.com

Mid State Realty

391 Spotswood Englishtown Road, Suite 1 Monroe Township, NJ 08831

Phone: 17322518900

www.midstate-realty.com

Davis Realtors

288 Summerhill Road East Brunswick, NJ 08816

Phone: 17322546700