How much does home extension & addition cost in Australia?
Home Extension & Addition typically costs between $50,000 and $400,000 (typical job) in Australia as of 2026. The exact price depends on the size of the job, access, materials, and where you are. Prices reviewed June 2026.
What affects the price
- Size and complexity of the job
- Ease of access and site conditions
- Materials and fittings chosen
- Whether it's an emergency or after-hours call-out
- Your location, metro vs regional rates differ
Cost by state
| State | Indicative range |
|---|---|
| New South Wales | $57,500–$460,000 |
| Victoria | $56,000–$448,000 |
| Queensland | $52,500–$420,000 |
| Western Australia | $55,000–$440,000 |
| South Australia | $49,000–$392,000 |
| Tasmania | $51,000–$408,000 |
| Northern Territory | $56,000–$448,000 |
| Australian Capital Territory | $54,000–$432,000 |
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Get free quotesFAQs
Do I need approval for a home extension?
Almost always — extensions need development and building approval, and a builder or certifier in your state can guide you through the process.
How much does home extension & addition cost?
As a guide, home extension & addition typically ranges from $50000 to $400000 for a typical job. The final price depends on the size of the job, access, and materials. The fastest way to know is to get a few free quotes.
How many businesses will contact me?
Up to 5 local businesses can pick up your request. You compare their quotes and choose, there's no obligation to go ahead with any of them.
Is it free to get quotes?
Yes. Getting quotes through Blue Collar News Services is completely free for you. The businesses pay us; you never do.