What Is
A Duplex

What Is A Duplex?

From the outside, a duplex looks like most other homes youll encounter. However, whats special about a duplex is that its actually two homes.

This residential building is divided by a common wall, with separate homes on either side that are generally inhabited by two unrelated parties. Most duplexes also have a fence dividing the backyard so each party has their own outdoor space.

Is a duplex development project right for you? Well cover everything you need to know to help you decide.

Benefits of owning a Duplex

Opting for a duplex instead of a traditional single-family home provides you with a number of benefits, including:

  • Better Return on Investment: Because you have two homes youll generally make more money selling or renting out a duplex than you would a single-family home.
  • Rental Income: A duplex is also beneficial if you plan on living on the property. You can live on one side and rent out the other which helps with your mortgage payments.
  • Tax Deductions: Because a duplex is a rental property you can deduct certain expenses from your income tax.


  • Youll Own Two Homes: After construction of a duplex is complete the duplex is divided into two single title homes. That means youll be the proud owner of two homes instead of just one.

What Kind of Layouts are There?

Like any home, duplexes come in all shapes and sizes. Here are some examples of the layouts that are available to you:

Example Plans

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Example 1

This is the most common duplex configuration. It uses a symmetrical design, with both sides of the duplex being identical. Each side has three bedrooms, two bathrooms, and a double garage measuring 160 m.

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Example 2

Depending on the land youre using, sometimes it might make more sense to use an asymmetrical duplex design where each side is different.

In this example, one side of the duplex has three bedrooms, two bathrooms, and a single garage measuring 150 m. The other side has two bedrooms, two bathrooms, and a smaller garage measuring at 75 m.

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Example 3

If youre building on a corner block you may want to utilize a layout that incorporates separate street frontage for each side of the duplex. This provides even more separation and gives the appearance that each side is its own separate house.

In this sample layout, both sides have three bedrooms, two bathrooms, and a double garage measuring at 143 m. The only difference is that the layouts are reversed on either side.

Whats The Difference Between a Duplex and a Dual Key?

A dual key is similar to a duplex and often has a layout like the one in Example 2 above. The difference is that its not divided into two single title homes. So, while you can rent out the property to two different parties you cant sell each side to two different buyers, which will likely reduce the amount youll be able to profit from the property.

Can Any Property be Used for a Duplex Development?

Unfortunately not. Only a very small percentage of available land is suitable for a duplex development project. Youll need to work with local council members and/or planners to confirm whether a property can be used for a duplex. There is a significant level of expertise required for this, and if you want to go through the process it could end up costing you up to $50,000.

Avoid the Hassle and Build with Duplex Invest

Duplex Invest offers ready to start duplex development projects in NSW, VIC, and QLD. Weve already taken care of all the hard work, costs, and due diligence to save you time and money. Once your project is underway well manage it to completion, sale, or rental.

Over the past five years, weve been involved in hundreds of successful property development projects all across Australia. In addition to our ready-made projects, you can also utilize our fully inclusive project management services for your own duplex projects.

Do You Have Questions, or Would You Like To Discuss Your Personal Investing Needs...

Thinking about starting your own duplex project? Click Here And Talk To One of Our Professionals