House Extension Cost Calculator

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.

The average cost of a house extension in Christchurch and Selwyn can be anywhere in the range from $3000 to $5000 per square metre, depending on things like the complexity of the design, materials used, the size of the extension, type of room that is being extended, how much of the existing house is being affected by the extension and the individual site requirements of the particular project.

Here at Rise Residential, we provide quotes that are detailed and transparent to help you understand fully what the scope of your investment entails with no surprises. Our team is here to guide you at every step to make sure this extension is cost-effective for your wallet while adding loads of value to your home.

How Much Does an Architect Cost for an Extension?

The amount an architect will charge for a house extension in Christchurch does vary, but it is commonly around $7,000 – $15,000, depending on the project’s complexity and scope. Architects provide the bridge in major design processes that ensure your extension is visually stunning, structurally sound, and compliant with the local regulations.

House Extension Calculator

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