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What Is a Duplex House? Definition, Benefits, and Floor Plan Ideas

With two separate living units under one roof, duplex houses are a smart option for families, investors, and anyone looking for versatile housing.

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2D floor plan of a symmetrical duplex layout, with two mirrored living units. Each unit includes a central open-concept living space, a kitchen and dining area, two bedrooms, a bathroom with a toilet and shower, a private sauna, and multiple storage closets (W, WH). Both living spaces feature high ceilings labeled "open above," and the front entrance leads into a shared hallway with stairs leading upward. The layout is functional and compact, ideal for two families or guests sharing a property.
Trude Carlsen

What is a Duplex House?

A duplex is a residential building with two separate living spaces, either side by side or stacked one above the other.

Duplex homes combine the ease of access and outdoor space you get with single-family homes, with the added sense of community that comes from living close to others.

They’re often more affordable than single-family houses, making them a smart choice for families, small businesses, and investors.

Benefits of Duplex Houses

The popularity of duplex homes is growing, and it’s easy to see why. Here are some of the main advantages:

Open concept duplex house plan.
Open Concept Duplex

Common Features

When exploring duplex house plans, it's crucial to consider specific criteria that align with your lifestyle and preferences.

For instance, you may prefer a single-story dwelling to avoid stairs, or a 2-story floor plan might better fit your smaller lot size. Determining the number of bedrooms you need is another essential factor in ensuring that your duplex home meets your family's requirements comfortably.

Number of floors

Depending on the available space and your preferences, duplexes can vary from comfortable single-story units to spacious multi-level dwellings catering to diverse family sizes and lifestyles.

Duplex house plan with two floors.
Duplex with Two Floors

Garages

Garages are another crucial feature to consider in duplex house plans. Many designs offer one or two garages, providing residents with secure parking spaces or additional storage.

A clever design choice involves positioning the garages in the middle of the building, with the living spaces on either side. This effectively acts as a buffer zone, minimizing noise transfer between the living spaces and ensuring a quieter environment for both households.

Number of bedrooms

Each side of a duplex usually contains a kitchen, living room, one or more bathrooms, and two to four bedrooms. Some duplexes have a mirrored floor plan where each side or level has the same layout and number of bedrooms, but other duplex house plans have different floor plans for each residential unit.

Duplex shotgun house plan in 2D and 3D.
Duplex Shotgun House

Other Features

Duplex homes often incorporate key features such as efficient storage solutions, modern kitchens, and well-designed bathrooms. These thoughtful inclusions enhance the overall functionality and comfort of the living spaces, making duplex homes highly desirable.


Tablet view of the RoomSketcher app displaying a 2D floor plan of an apartment layout with labeled rooms and dimensions, including Living Room, Kitchen, Dining Room, Bedroom, Bathroom, Laundry, Closet, Hall, and Balcony. The right side shows a scrollable library of door styles available for placement in the design.

Draw Your Own Duplex Floor Plan

With the RoomSketcher app, you can draw, customize, and visualize layouts in 2D and 3D.

  • Create professional floor plans with ease
  • Explore mirrored or unique designs for each unit
  • Add exact measurements to get accurate plans
  • Visualize outdoor areas, garages, and storage
  • Walk through the layout with Live 3D

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