Buying guide

House extensions: Everything you need to know

Read this before you break ground

Ben Tutty
Last updated: 29 October 2024 | 7 min read
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Considering a house extension? This guide covers the essentials for your project. Costs vary significantly, from $50,000 for a basic room to over $400,000 for larger additions, influenced by size, materials, and site conditions.

The process involves hiring an architect, securing finance, and obtaining council consents before choosing a builder. A solid contract is crucial, and it's wise to have a lawyer review it.

Prioritise consents early to avoid delays and budget for a 15% contingency.

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

Author

Ben Tutty Ben Tutty
Content Writer