Duplex Designs & Developments in Perth

Thinking about developing your property’s potential? If the existing home on your property is not worth keeping, you could demolish it and build duplex homes. As the foremost trusted duplex builders in Perth, our expert team at Developments by Dale Alcock can help you unleash your property’s potential and maximise your investment. A duplex development can be a relatively simple style of development, making it popular with new developers.

Duplex Development - Wembley Downs* One of the most sought after property investment solutions
* The simplest dual-occupancy project 
* A good way to dip your toe into the property development market.

A duplex development involves building two houses of similar size (single or two storey) on one subdivided block.

Depending on your block shape, duplex developments can take two forms:

1. Side by side
This allows for maximum street frontage for both properties              

2. Battle-axe
This involves building one dwelling behind the other


View case studies & galleriesView floorplans

Townhouse from $229,000


Before embarking on a duplex development, the first step is to check the Residential Planning Codes (R-Codes) of the area, as they differ from council to council. As R-Code specialists, we can consult with local councils and planning consultants on your behalf to work out what’s possible on your site and whether it will be impacted by future zoning changes.

Here are the most common duplex development zonings and area calculations.                                                              

Duplex Development Requirements


  Required Land Area









The figures above are subject to Council policies and the R-Codes

How to Profit

Having more than one property on the same block will generally increase equity. By subdividing your block and building two low maintenance dwellings, duplex designs open up an array of profitable options:

  • Rent both properties to receive double the income revenue from your block
  • Sell both homes and pocket the profits 
  • Move into one of the units and sell the other 
  • Move into one of the units and rent the other out for an additional revenue stream to pay off your mortgage faster.

What can I build?

Single storey units or double storey townhouses – or a mixture of both - can be built on a duplex / triplex / multi-unit site. Which ones you choose will depend on who you are building for.

Having all the accommodation on one level has strong appeal for empty nesters and retirees with an eye on the future. Families with small children also often prefer to live in a home without stairs. Single-storey units are associated with quicker build times, which is a big plus when you’re a developer and time is money.

Two storey townhouses are a great solution if you want to maximise space on your block. They are particularly popular in inner-suburb areas, or where developers are looking to get a greater yield or higher selling price. Not only do two-storey designs have a height advantage that can help you capture views, but they can also, in some suburbs, be perceived as ‘trendier’ or more desirable than single-storey homes. Families with older children often like the sense of separation that comes with having accommodation over two levels. The upper level can be ideal for a master suite or teenage retreat, while the home’s smaller footprint can potentially mean more backyard space.

View our unit and townhouse designs

Duplex Floorplan Examples

Explore a range of contemporary, cutting-edge duplex design concepts with our specialist residential development team in Perth.

DxDA Tips & Resources

Why Developments by Dale Alcock?

It’s a simple equation – the more units you build, the higher degree of complexity. For multi-unit designs in Perth there are additional factors to consider to satisfy local council policies as well as the R-Codes. Extra consideration must be given to power, sewerage and driveway drainage requirements, and even solar orientation.

However, the more units you can construct, the more opportunity there is to see a strong return on investment. That’s what makes partnering with the experts at Developments by Dale Alcock so invaluable. As the multi-unit builder Perth trusts, we can provide a full feasibility study before moving ahead with the development project to give you full confidence your design will maximise profits.

Meet our Development TeamMake an enquiry

30 Years experience

30 years' experience
As R-Code experts, we’ll show you exactly what’s possible on your block, so you won’t get caught out later.

On time. On budget. Guaranteed.

On Time. On Budget. Guaranteed.
Enjoy complete peace of mind knowing we promise to make your experience a smooth and enjoyable one.

Complete design to construct service

Complete design to construct service
Our dedicated architectural design team only works on development projects, allowing us to create both custom designs and off-the-shelf plans.

You're in safe hands

In safe hands
We’re all about maximising your profit, minimising cost and reducing risk.

Got a question about duplex developments?

Got a question about the best way to go about duplex developments in Perth? Want to know more about what we do as duplex builders? Please don’t hesitate to get in touch for an informal discussion about your plans and how we can help.


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