If you’re on the hunt for a professional, high-quality and affordable extension builder, Canberra-based company One M Group is here to help. We offer smart extension solutions to customers in the Canberra region, serving to enhance and enlarge existing properties.

Expert Builder

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Meet Your Expectations

We do our best to satisfy our clients.

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Be Your Trustworthy Builder

We are equipped with skills, knowledge and experience.

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Provide Various Services

We carry out services from small alterations to large home extensions.

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Save Your Efforts

We are capable of managing the whole extension process and save you from stress.

Be Proud Of Your Home

years established

+ completed projects

Why opt for an extension?

Many homeowners find that as their families grow, they need more rooms. If you have found yourself low on space, investing in an extension could be a great option for you. As well as being an affordable solution, an extension can significantly boost the price of your home and improve its overall appearance.

What are the benefits of building an extension?

Let’s take a closer look at the benefits of building an extension:

  • You can make the most of the available light around your home – You can take the time to consider where the light would fall on your extension at certain times of day, particularly if you want to achieve bright, airy spaces.
  • You don’t always need planning permission – Getting an extension is usually considered a permitted development, which means you may not need to get planning permission. Although you will have to check the rules and regulations of your local council, you will be good to go as long as your extension does not exceed any of these.
  • There are so many options to choose from – You can scale your extension upwards, outwards, or even downwards.

The extra space provided by an extension offers more advantages than many people realise. As well as creating extra bedrooms for a growing family and guests, a home extension can be used to create an office, a gym, an entertaining space or even simply to create more storage space – the options really are endless.

Why choose One M Group?

One M Group is professional extension builder in Canberra and our extension builders understand building code requirements and council regulations, which means if your extension exceeds a certain floor area or you need to apply for special permissions in order to commence building work, One M Group can talk you through your options and come up with effective solutions.

Get in touch with us today

Above all, Do not hesitate to get in touch with One M Group today to discuss your extension plans today and to hire the best extension builder in Canberra.

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Here’s some of the common questions we get asked

If you have any other questions, get in touch!

How long does it take to build a home?

Generally single storey homes can take between 6 to 10 months from the time the slab is poured.

Two storey homes you allow for around 12 months from the time the slab is poured.

You will need to allow around 3 to 4 months for the buildings approvals.

How do I start the process?

The first step is to see a Designer or Architect. Depending on your requirements once you have your design you can either submit for tendering yourself or let a broker do the hard work on your behalf.

What approvals do I need?

For projects that comply with the Territory Plan, making your project DA Exempted, than Building Approval is all you will need and this can be done through a building certifier.

If your project is not DA Exempted than you will need Development Approval through ACTPLA.

What is practical completion?

Practical completion means the renovation/extension is complete, however it may still a few finishing touches still outstanding. At time of handover, a Practical Completion inspection will be made by the One M group along with the clients, and any defects if any will be noted and rectified..

How long is the council approvals process?

As a guideline the Council building approvals process takes approximately 12 weeks. This may differ depending on the time of year, Council requirements, buildings procedures and administrative resources. One M Group are highly experienced in liaising with both ACTPLA and QBN City Council to seamlessly navigate the building processes on your behalf.

Please appreciate that the number of building applications either Council may be processing at any one time can vary, therefore occasional delays may occur. By choosing One M Group to assist with your buildings approval process, you can rest assured that delays caused by application errors are extremely unlikely, and we will carefully monitor your case to ensure that it is progressing in a timely manner.

If you would like to know more about the buildings approvals process, you will find that both ACTPLA and QBN City Council has a ‘Planning section’ on their websites with useful information. 

Will the builder regularly on my job ?
You will need to allow around 3 to 4 months if you require Development Approvals in place of, the buildings approvals.
Can we still live in our house through the extension / renovation ?

It will depend principally on the design of your extension and renovation and how much of the existing house will be affected. If it is possible and it is safe, than One M Group has no problem working with the clients to help them stay in their home.

What is the difference between a Renovation and an Extension ?

Commonly a renovation is within the existing walls of your home, they can be as small as an ensuite, or as large as removing walls for an open plan kitchen living.

Extensions are, pushing out, adding on more floor area to making more room, most of the time an extension will also involves a renovation of the existing as well.

Do I need anything in addition my new plans ?

You will a set of Engineering plans to detail the structural elements of your new home, theses plans can be arranged by yourself, the designer or your builder.

What our clients say

“I can’t say enough good things about One M Group. Aaron had some great ideas in addition to those of the architect, and he did a brilliant job of redesigning on the fly. His attention to detail is excellent and his work is immaculate. We were also impressed with Aaron’s ability to identify potential issues early and to consult with us throughout every stage of the work.”



Fisher ACT

“I would have no hesitation in recommending One M to anyone planning renovations to their home. We could not have been more impressed with the final product. The construction team were extremely considerate and professional and the job was completed ahead of schedule. We would certainly engage Aaron and the team again for further work.”


Mark & Laura

Watson ACT

Contact us

0407 078 136

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