Knock Down Rebuild Cost Calculator & Price Guide
A knock down rebuild can be a smart way to stay in the suburb you love while replacing an outdated home with a brand-new one. In Australia, knock down rebuild cost typically starts from around AUD 450,000 for a single-storey home on a flat block and can reach AUD 1,100,000 for a large or custom home before site access or asbestos costs are added. This knock down rebuild cost calculator guide helps you compare the likely knock down rebuild price for different home types and site conditions.
Estimate knock down rebuild cost
Build midpoints for one house in Australia. Rates cover demolition of a typical home plus a new build on a flat block. A slope or tight access lifts the price. Asbestos removal is a separate add-on. Pools and high-end finishes are usually extra.
Estimates are indicative only. For an accurate price, get free quotes from local tradies above.
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Knock Down Rebuild Price Breakdown
Typical job based on 1 home (Flat block). Prices are supply-and-install midpoints — actual quotes will vary.
| Type | Cost per home (Flat block) | Typical 1 home (Flat block) job |
|---|---|---|
| Single-storey home | $450,000 | $450,000 |
| Double-storey home | $750,000 | $750,000 |
| Large or custom home | $1,100,000 | $1,100,000 |
What Affects Knock Down Rebuild Cost?
- Home type and size: The biggest driver of the cost to knock down and rebuild is the type of home you choose. A single-storey home is priced at AUD 450,000 per home, a double-storey home at AUD 750,000, and a large or custom home at AUD 1,100,000 on a flat block.
- Block conditions: Site conditions change the base build price through set multipliers. A flat block uses ×1, a sloping block uses ×1.2, and tight access uses ×1.25, so more difficult sites increase the total knockdown rebuild cost.
- Asbestos removal: If the old house contains asbestos, this adds AUD 25,000 per home to the total project cost. Homes with no asbestos removal required have no added charge for this item.
- Minimum project charge and estimate range: Displayed estimates use a range of plus or minus 20% around the midpoint to reflect normal variation. There is also a minimum job charge of AUD 350,000 if the calculated total falls below that amount.
Knock Down Rebuild Cost - Frequently Asked Questions
For 1 home on a flat block, the starting point is AUD 450,000 for a single-storey home, AUD 750,000 for a double-storey home, and AUD 1,100,000 for a large or custom home. If asbestos removal is needed, add AUD 25,000 per home. The displayed estimate range is then shown at plus or minus 20% around the midpoint.
A common family knock down rebuild is a double-storey home priced at AUD 750,000 per home on a flat block. On a sloping block, that figure is multiplied by 1.2, bringing the midpoint to AUD 900,000 before any asbestos costs. If access is tight instead, the multiplier is 1.25.
The main cost drivers are the home type, the block conditions, and whether asbestos removal is required. For example, moving from a single-storey home at AUD 450,000 to a large or custom home at AUD 1,100,000 has a major impact. A sloping block or tight access also increases the price through the listed multipliers.
A knock down rebuild cost calculator starts with a per-home base price and then adjusts it for site conditions and asbestos removal. In this guide, the base rates are AUD 450,000, AUD 750,000, or AUD 1,100,000 per home depending on the build type, with block multipliers of ×1, ×1.2, or ×1.25. The final displayed estimate is shown as a range of plus or minus 20% around that midpoint.
A sloping block uses a ×1.2 multiplier on the base home price. That means a single-storey home goes from AUD 450,000 to AUD 540,000, a double-storey home goes from AUD 750,000 to AUD 900,000, and a large or custom home goes from AUD 1,100,000 to AUD 1,320,000 before asbestos removal. Add AUD 25,000 per home if asbestos removal is required.
The listed prices include demolition plus the new home build for the selected home type. Asbestos removal is treated separately, with an added AUD 25,000 per home where required. When comparing knock down rebuild builders, it is worth checking whether their quote matches these inclusions and site assumptions.
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