Duplex or Multi-Family Plans

Versatile Duplex House Plans and Floor Plans for Families and Investors

The House Plan Company offers an extensive collection of duplex plans and duplex house designs for homeowners and investors alike. Our duplex house plans feature two or more separate residences within a single building, making them ideal for families who want to live close together or for those seeking a smart investment property with rental potential. Built on a single lot, these homes typically include shared walls and comply with high-density zoning requirements.

Our duplex designs strike the perfect balance between functionality and style. Whether you prefer a one-story or two-story layout, these homes provide separate living units without feeling cramped. Each unit is thoughtfully designed with open floor plans, spacious living areas, and flexible layouts to accommodate modern family lifestyles. Additional features may include private patios, garages, and ample closet space.

At The House Plan Company, our collection of duplex floor plans and multi-family home plans comes in a variety of styles, sizes, and configurations. While many units are mirrored for efficiency, our designs offer customizable options for bedrooms, bathrooms, and living spaces, ensuring your duplex house plan is perfectly tailored to your needs. From traditional to contemporary architecture, our duplex designs maximize space, functionality, and curb appeal.

Explore our curated collection of duplex plans and duplex house designs today to find a versatile home that meets your lifestyle and investment goals.

Reach out to our experts today, and we will guide you through choosing the ideal family plan for your new modern home with separate living units.

Duplex & Multi-Family Plans FAQ

Common Questions Learn More Duplex Plan Inspiration

What is a duplex house plan?

A duplex house plan is a home design that includes two independent living units in one building, each with separate entrances, kitchens, and living spaces. Unlike a single-family home plan, which accommodates only one household, a duplex allows two families to live separately on the same lot. Duplex plans can be side-by-side or stacked, often with mirrored layouts, and may include shared walls, garages, or yards. These designs are perfect for multi-generational living, rental income, or investment properties, combining efficient use of space with privacy and flexibility.

What are the benefits of owning a duplex?

Owning a duplex house plan provides several advantages over a traditional single-family home. You can live in one unit while renting out the other, generating steady rental income that can help cover mortgage payments or maintenance costs. Duplexes also offer flexibility for multi-generational living, allowing family members to live nearby while maintaining privacy. Additionally, duplex designs often maximize the use of a single lot, making them ideal for investment properties or high-density areas.

Are duplex floor plans typically the same for each unit?

Most duplex designs feature mirrored or identical units to maximize efficiency and simplify construction. However, many floor plans offer customizable layouts to suit different lifestyles and preferences. While side-by-side duplexes are usually mirrored, stacked duplexes or multi-story designs may vary unit layouts. Regardless of the configuration, duplex plans are designed to maximize space, privacy, and functionality for both households.

What should I consider when choosing a duplex house plan?

When selecting a duplex house plan, consider factors like the number of bedrooms and bathrooms, layout preferences, and desired architectural style. Think about whether the property will be for personal use, rental income, or both, as this can influence room configurations and unit size. Additional features, such as open floor plans, garages, patios, or storage space, can enhance livability and appeal. Choosing the right duplex design ensures your home meets both functional needs and investment goals.

What modifications can I make to a duplex house plan?

Duplex plans are highly customizable to fit your specific needs. Common modifications include adjusting room sizes, changing layouts, adding or removing walls, modifying window or door placements, and updating exterior finishes. Many homeowners also incorporate energy-efficient upgrades or modern amenities. Consulting with an architect or designer ensures that all modifications comply with local building codes and zoning regulations, while keeping your duplex both functional and stylish.

Blog | Designing Your Dream Duplex: Key Considerations for a Functional and Stylish Home

When you hear the term "duplex," you might envision a single building cleverly divided into two separate homes, each with its own entrance and living facilities. Essentially, a duplex is a multi-family home plan that accommodates two families or groups under one roof, usually sharing a common wall. This unique setup offers numerous benefits, making it an increasingly popular choice in today's housing market.

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Blog | Multigenerational House Plans and In-Law Suites

There are countless reasons to think creatively when designing your perfect home plan. Whether you're looking to generate rental income, accommodate aging parents, or create space for adult children, a strategically designed home can meet multiple needs while maintaining privacy and independence for all residents. Homeowners in 2025 are increasingly seeking plans with the versatility of in-law suites, duplexes, and multi-generational layouts. From modern farmhouses and contemporary cottages to craftsman designs and sustainable hillside homes, there's a wide variety of options that combine adaptability with luxury living.

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Unique Duplex Plans

Looking for a duplex plan that offers unique floor plans for each unit? Take a look at these creative designs!

Plan Details Plan Image

Plan 73468

  • 2020 sq ft
  • 3 bedrooms
  • 2 bathrooms
  • 0 car garage
  • 1 story floor plan

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 Plan 73468

Plan 94115

  • 2288 sq ft
  • 5 bedrooms
  • 3 bathrooms
  • 2 car detached garage
  • 2 story design

View Floor Plan

 Plan 94115

Plan 50992

  • 2855 sq ft
  • 5 bedrooms
  • 4.5 bathrooms
  • 2 car garage
  • 2 story design with basement

View Floor Plan

 Plan 50992

Plan 35744

  • 1948 sq ft
  • 4 bedrooms
  • 3 bathrooms
  • 1 car garage
  • 1 story design

View Floor Plan

 Plan 35744

Plan 94445

  • 2045 sq ft
  • 3 bedrooms
  • 2 bathrooms
  • 2 car garage
  • 2 story design

View Floor Plan

 Plan 94445

Looking for more great duplex plans?? Explore the full collection here: Duplex Home Plans

Stylish Duplex House Plans & Multi-Family Designs

Looking for duplex and multi-family home plan inspiration? Explore our curated Pinterest board, Stylish Duplex House Plan s& Multi-Family Designs

DISCOVER MORE FROM HPC

From in-depth articles about your favorite styles and trends to additional plans that you may be interested in. The House Plan Company is here to make the search for more — easy for you.

Plan modification

Plan modification services give you the flexibility to personalize a house plan to suit your specific needs. Whether you're looking to adjust the layout, add extra rooms, or enhance architectural features, we can help you create a design that aligns with your lifestyle and site conditions. Our expert home plan modification services are a great way to get your dream plan. By working with us, you can customize a home that’s uniquely yours, saving time and resources while ensuring the final design meets all of your needs. Start designing your dream home today with our professional house plan modifications.

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