Looking to add extra space to your home with an extension or renovation? Want to know the costs involved before you commit to a project? Our extension cost calculator is here to help!

Answer 14 quick questions and
you’ll get an instant budget for building.

Disclaimer: While every effort has been made to ensure the accuracy of the figures shown by the calculator, the results should be used as a rough guide only, it is not a quote. Before relying on this material for any important matter, users should carefully evaluate its accuracy, currency, completeness and relevance to their purposes, and should obtain any appropriate professional advice relevant to their particular circumstances. Results received from this calculator are designed for comparative purposes only, and accuracy is not guaranteed. Home Owners Association and its partners do not guarantee the accuracy of any information available on this site, and is not responsible for any errors, omissions, or misrepresentations. 

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It is always best that you discuss your options with a professional builder like Cameron Construction who specialise in extensions and renovations and will minimise the risk of costly mistakes. We also recommend that you contact our website sponsors for further information. Talking to a professional will minimise hidden and unforeseen costs that could arise during the design and build stages.

This calculator may provide insight into the cost of home extensions in Melbourne Sydney and Brisbane and is only intended as a rough guide; it is not a quote.

This guide has attempted to include most of the design and build costs for a medium to high quality of build, including permits. Contact our sponsors for further information and verification about realistic costs for home extensions.