Our Expertise

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Duncan Thompson has completed more than 1,000 quality home additions and renovations in Melbourne in the past two decades.

House Extensions

With our unmatched quality, specialist in-house designers and an unwavering eye for architectural detail, Duncan Thompson's house extensions have created happy homes and sound investments for many families in the inner, eastern, south-eastern and bayside suburbs of Melbourne.

Extension Design

Duncan Thompson's extension design team brings each individual team member's respective professional strengths together to create quality built home extensions that reflect your family's needs and work within your budget.


We specialise in all types of housing renovations. A good quality renovation should complement the best aspects of a house, and it takes a renovation builder with a combination of high quality skills, knowledge and experience in order to achieve a quality extension.

Extension Building

Duncan Thompson has been building extensions since the 1980s and with over 1,000 successful projects undertaken, we are respected within the industry by our peers as a leader in the field of home extensions, design and construction.

Heritage Extensions

If you are in love with your heritage home but need more room, then you need a builder with the right touch to deliver you an extension that doesn't compromise on the original style of your classic home.

2nd Level Extensions

A double storey extension is perfect for a growing family and offers great versatility, and value, to your home. We have tonnes of experience building double storey extensions in Melbourne's inner Eastern and South-Eastern suburbs.

I would like to express my thanks to all involved in the extension. I am really happy with the work and have recommended Duncan Thompson Extensions to friends who are thinking of having work done. Nothing was too much trouble for Duncan Thompson Extensions. Thank you to you all again.

Viv Pye 2006