Concept To Completion

Boutique Home Builds
Why We're Different

Quality Inside & Out

No Stone Unturned
Our Projects

Modern Elegance

All In The Finishes

Transform Your Dream

The Extension Experts

WARNING! Please do not communicate with any third-party representatives
via other websites or classifieds, claiming to represent Duncan Thompson Extensions.
Please ONLY make contact via email: or phone: 03 9836 8655

Covid-19 Update.

Duncan Thompson Extensions is open and operating in accordance with the current guidelines outlined by the current Australian Government at this time .

For any enquiries please contact our office by phone on 03 9836 8655 or message us via our website info portal.
We will update our information as the situation changes.

Steps to your extension during COVID-19 Restrictions

Duncan Thompson Extensions is a leading Melbourne Home Extension Builder. We're passionate about quality workmanship and design.

We design and build house extensions of the highest standard across Melbourne's inner Eastern and bayside suburbs.

House Extension Design

We have all the experience, skills and craftsmanship needed to build your extension to the highest standard. Our experienced builders work to a level that gives you a superior quality of home extension.

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Home Extension Builders

Our design team is a carefully selected group of qualified designers, draftspeople and builders, each with extensive expertise in home extensions, additions and renovations.

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Melbourne Home Extensions

Home extensions are what we do. For over thirty years, we have proudly designed and built thousands of beautiful home extensions in Melbourne's inner Eastern and Bayside suburbs.

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Experts in Single & Double-Storey Extensions

When you’re running short of space in your home, you either need to build up or extend out. Our designers have the expertise and experience to design the perfect single- or double-storey extension for your home. Once you’re happy with the design, our highly skilled building team will bring that vision to life. Because we offer a design & build service, there’s no gap between vision and the final result.


Duncan Thompson Home Extensions. SEN Radio advertisement 2019

What makes us one of Melbourne's very best home extension builders?

Years of Experience

We have over thirty years experience of working with families to find the best and most attractive options for their homes.

Fast and Accurate Quoting

Get your extension started sooner. We will provide you with an accurate quote and concept designs within weeks of our first meeting.

Our People

We know and trust that our designers and tradespeople are capable of a high standard of workmanship.

Quality Comes First

We don't cut corners on materials or workmanship. We only source materials from leading suppliers, recognised to meet industry standards.

Value for Money

We'll work hard to find the best solutions for your home at the best value.

Concept to Completion

A fully managed, collaborative approach between you and our design and building teams will ensure a smoother process with minimal disruption to your family's busy life.

Latest Projects

Mont Albert

New Home Extension


New Home Extension

Camberwell North

New Home Extension


New Home Extension


New Home Extension

Surrey Hills

New Home Extension

Mt Waverley

New Home Extension

Why house extensions are better than buying a new home.

When a home starts to feel too small for a growing family, many people believe that buying a new home is the answer. But why uproot your family and leave behind all those precious memories when a renovation will solve all of your problems. Renovating is not only easier and more affordable, it’s also the best way to make the most of the home you already love, so you can enjoy it for years to come.

Experience the Duncan Thompson Extensions difference.