How Much Does a Knock Down Rebuild Actually Cost in Sydney?

This is the question we get asked more than any other. And we get why — most builders either dodge it with a "every project is different" non-answer, or they throw out a number so low it bears no resemblance to your final invoice.

So here's the honest answer, broken down the way a licensed builder would explain it to a friend.

The Realistic Price Range

A knock down rebuild in Sydney typically starts from $950,000 to $1.2 million for a standard 4-bedroom home on a suburban block. Larger homes, premium finishes, or tight sites push that figure to $1.5 million and beyond.

That number includes the full build. What it doesn't include — and where a lot of homeowners get surprised — are the costs that come before the slab is poured.

What You're Actually Paying For

• Demolition: $15,000–$30,000 depending on structure size, asbestos, and access
• Council DA or CDC: $5,000–$25,000 in fees alone, plus certifier costs
• Engineering & soil reports: $3,000–$8,000 — non-negotiable, and varies a lot by site
• Connection fees (water, sewer, electricity): $8,000–$20,000 — often forgotten entirely
• Landscaping & driveway: $20,000–$60,000 (rarely included in base build quotes)

What Drives the Price Up?

Site conditions are the biggest wild card. Clay soil, rock, sloping blocks, and narrow access all add cost. A soil report before you commit to a builder isn't optional — it's the only way to price your build accurately.

Finishes matter too, but less than people expect. The difference between mid-range and premium finishes on a 4-bed home is typically $80,000–$120,000. The difference between a tight or complex site and a flat rectangular block can be double that.

Why Quotes Vary So Much Between Builders

A lower quote almost always means something is missing — inclusions that seem standard but aren't, provisional sums set unrealistically low, or site costs not yet assessed. A fixed price contract means nothing if the fixed price is based on assumptions that haven't been tested against your actual block.

At ResiCorp, we don't give you a number until we've reviewed your plans, your site, and your council requirements. It takes a bit longer upfront. But the number we give you is the number on your invoice.