Buying guide
House extensions: Everything you need to know
Read this before you break ground
AI summary
Extending your home is a major project with costs from $50,000 to $400,000+, depending on scale, materials, and site conditions.
Key steps include hiring an architect, securing finance, and obtaining council consent early. Choose your builder carefully and have a lawyer review the contract. Plan for a 15% budget contingency for unexpected costs.
The project is officially complete once you receive your Code Compliance Certificate (CCC) from the council, confirming the work meets requirements.
How much does a house extension cost?
Rough guide to NZ house extension costs
What affects the cost of house extensions?
Extent of extensions
Materials used
Your site’s conditions
Council consents
In most cases you'll need to get consent before extending your property.
The NZ house extension process
It's a good idea to get a clear idea of costs before you start a project
If you can do some work yourself you could save thousands of daollrs.
Hot tips for building an extension
The contract is key
Think about your neighbours
Prioritise consents
Demand cost and timeline certainty but plan for blow outs
Build for the future
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