House & Timber Plan Co.

Collection

Duplex House Plans

Side-by-side duplexes with two mirrored units, each with its own entry, kitchen, living space, and bedrooms. Live in one side and rent the other, or build both as rentals.

Plans

1143 plans available

About This Collection

Duplex House Plans

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Duplex house plans put two complete homes under one roof. House & Timber Plan Co.'s side-by-side duplexes mirror each unit across a shared party wall, so both sides get the same layout, the same light, and their own front door.

Each unit includes its own entry, kitchen, dining and living areas, bedrooms, bathrooms, and laundry. Two-story designs put the bedrooms upstairs, and some plans add a single-car garage to each side.

Duplexes are a popular way to build rental income: live in one unit and rent the other, or rent both. They're also well suited to multigenerational families who want to live close together while keeping separate households. Zoning for two-family homes varies, so confirm that a duplex is allowed on your lot.

Duplex plans start at $99 with instant PDF download. Listed bedrooms, bathrooms, and square footage are totals for both units. Each plan set includes floor plans, exterior elevations, a roof plan, sections, and an electrical layout, ready for your builder.

Common Questions

FAQ

What is a duplex?

A duplex is a single building with two separate homes, each with its own entrance, kitchen, and living space. Our duplex plans place the units side by side, mirrored across a shared wall.

Are the bedrooms and square footage per unit or total?

The listed bedrooms, bathrooms, and square footage are totals for the whole building. Each unit has half, so a 4-bedroom, 2,400 sq ft duplex has two 2-bedroom, 1,200 sq ft units.

Can I build a duplex on my lot?

It depends on your zoning. Many residential areas allow duplexes, and more cities are permitting them. Check with your local planning department.

Do duplexes need a fire-rated wall between units?

Building codes generally require a fire-rated separation between units. Your builder or a local design professional will detail the party wall to meet your local code.