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Over the last 30 years Duncan Thompson Extensions has built thousands of house extensions in Melbourne's inner eastern, south eastern and bayside suburbs.
Our experienced builders and tradespeople have been with us for many years. We are confident that we have the best people working on your home.

Our builders are literally the best in the business

Unlike some builders our team of experienced tradespeople have been with us for many years and possess all the skills and craftsmanship necessary to build any extension to the highest standard. Carpenters, electricians, bricklayers, plasterers, tilers, painters, no matter what the trade, we have the best people working with us.

Because we offer such a good work environment for all our people, we are often approached by trades people wanting to work with us. We only source our materials from leading trade suppliers who are recognised in the industry for good quality materials that meet all relevant industry standards.

Choosing the right house extension builder

The most important thing on your wish list when choosing a builder for your home extension should be quality. You are about to embark on a once in a life time project on what could be your most valuable asset, your home. After you have paid the final bill the most important consideration is that you will have to live with the finish and quality forever. So ask your builder to provide you with photographs of home extension projects they completed. Ask for references from previous customers.

From concept to completion

Duncan Thompson is a full-service house extension builder, so when we say "from concept to completion", we mean it. We work with you during every stage of the development: from the initial consultation; through the design stage; all the way through construction; and finally, to completion. We will always be there to manage the project—there is no better way to make sure a house extension project stays on task, avoids complications and also meets your every need.

Professional Memberships & Accreditations

Duncan Thompson Extensions staff are professional, knowledgeable and courteous. When something goes wrong they are willing and able to fix it. They listened to our questions and answered them, and they cleaned up after themselves.

Rhonda Lasky

House Extension Enquiries

Extension details

Getting started

Planning your home extension doesn't have to be daunting. Let us take some of the stress away. We offer a free, no obligation design consultation.

A senior member of our design team will be happy to talk to you and arrange a design consultation. We'll listen to your needs and discuss the best options for your family's lifestyle and budget.

Phone us on (03) 9836 8655 today to arrange your obligation-free Design Consultation across Melbourne's inner Eastern and bayside suburbs including Camberwell, Glen Iris, Brighton East, Surrey Hills, Balwyn, Hawthorn East, Brighton, Kew, Balwyn North, Caufield North and others!