Australian price guide · 2026
How much does home extension
cost in Australia?
Single-room or two-room extension — footings, framing, roofing, electrical, plumbing, fit-out.
Typical total (AU)$50,000–$120,000 for 18m²
What's in a typical quote
| Line item | Typical range |
|---|---|
| Per m² turnkey extension | $2,800–$4,500 |
| Council approval + engineering | $4,800–$9,500 |
| Contingency (10%) | Variable |
What affects the price
- Size m²
- Two-storey vs ground floor
- Finishes tier
- Council + engineering complexity
How to get the most accurate price
Prices vary a lot by region, access, and job specifics. For a real quote, get 2–3 licensed builders to assess the job — most reputable tradies quote for free. GST (10%) is added on top of the ranges shown.
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