Cost Calculator


House Extension Cost Calculator NZ

We’ve put together this house extension cost calculator to give you an idea of ballpark cost for those who are just doing a bit of research. The costs generated are based on average Christchurch renovation and extension costs on past completed projects. Please keep in mind that each house is unique in its construction, building materials, and site conditions, this calculator generates “rough” estimates and should not be used as a quote – for an accurate estimate, please contact us today.

Note: The prices are based on average costings in Christchurch region prices may vary in other regions of New Zealand

Size of extension (10m2 – 100m2 )

Size of internal alterations (10m2 – 100m2 )

Quality of Build/Materials

Does extension include a New Bathroom?

Number of bathrooms

Does extension include a New Kitchen?

Structural Engineer Fee

Architect Fee

Include Council Fee (No/Yes)

Note : If you would like to discuss your home extension project in more detail, please use the enquiry form on our contact page and we will get in touch with you at a time that suits you to discuss your project.

Where to send the results?

Please fill in your details below and your results will be sent straight to your email inbox. (double-check junk mail folder)