house extensions
extension builder melbourne


If you’ve just bought a run-down house in Melbourne and prefer to extend or renovate to put your personal stamp on it, or if you’ve lived in the same home for years and love the neighborhood but feel it’s time for a spruce-up, give us a call at the Extension Factory.

We are proud of our experience and expertise, the quality of our work and professional, premium service, and we bring all of that to the table when building the luxury home of your dreams. We will guide you through the renovation or extension process from start to finish, doing all the work for you – from the design, the plan and the council development applications, to the actual building work and the final clean-up.

Our tradespeople take care not to disturb your gardens or your routine and we take total responsibility for managing your build. We provide great service without the frustrating interruptions and delays often associated with the building process.

The Extension Factory, is the trusted name in renovations and extensions throughout Melbourne.

For the past 38 years, our highly skilled and talented teams have been fulfilling desires and dreams and building homes of distinction from conception to the day the keys are handed over. What’s more, these homes are built right on time and on budget. The Extension Factory philosophy has been the driver of our company’s strong reputation as a premier renovation and extension building company in Melbourne.

12 months No Interest and No Repayments* (conditions apply)

FREE No Obligation Design & Quote


The exciting journey towards the creation of a home of your dreams begins with a simple phone call to the Extension Factory to make an appointment with one of our talented and experienced house extension and renovation design consultants. You can meet one of our consultants either in our office or in your home to discuss your renovation or extension ideas and needs.

The next step is the development of a design concept and an estimation of the costs involved. This includes measuring and permits, a preliminary agreement document, plus you will receive a 3D concept plan of your home.


10-year Warranty – Free in-house Quotes – over 37 Years of Experience-

All-Inclusive Prices – Built On Time and On Budget – No Job Too BIG!

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Single storey ground floor additions

If you love your home but have outgrown it, a house extension is a great alternative to moving. Save time and money looking for a new home and resettling, plus save on moving costs and stamp duty.

Planning a ground floor extension? Is there enough available land, does your house layout need to be reconfigured, and what look, style and feel do you want to achieve?

Make sure you choose the right extension company. Someone who listens to your ideas, delivers what you want and honours your vision. Extension Factory have completed over 8,000 builds since 1979 and many of our team have worked here for more than 20 years, book a consultation to meet our talented team.


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The Extension Factory is Australia’s largest home improvement company, developed over many years on a model of practical and creative design. We offer our greater Melbourne metro area clients quality, premium personal service based on our professionalism, delivering quality, luxury homes efficiently and effectively. Because the Extension Factory is such a large company with more buying power, our Melbourne Metro clients can benefit from our competitive pricing.

Experienced, Quality Builders, Tradespeople & Staff – You receive a 3D Design of the Extension / Renovation

We build and design many kinds of home improvements, renovations and extensions, so whether your Melbourne home is a grand mansion, a ground floor apartment, a contemporary or federation cottage, our quality renovation home improvement builders and project managers will make sure you are living the dream sooner than you think.

Call us for a free no-obligation consultation.


We have completed thousands of home transformations throughout Melbourne.
You’ve probably seen our work in these areas and many more.

Glen Waverley
Mt Waverley
Wheelers Hill
Box Hill
Surrey Hills
Narre Warren