Knockdown Rebuild vs Renovate Calculator

About

KDR vs Renovate Calculator — Free Tool by Buildana

Should you knock down your existing home and rebuild, or renovate what you've got? It's one of the most expensive decisions a homeowner can make — and most people get it wrong because they're comparing gut feel, not actual numbers.

This tool puts real cost estimates side-by-side so you can make the call with clarity.

HOW IT WORKS
Enter your current floor area, your target floor area, the scope of renovation (cosmetic / partial / major), and your finish level. The calculator models both options using current Sydney market rates and shows you which path costs less — and by how much.

WHAT IT COMPARES
• Knockdown & Rebuild: demolition costs + full rebuild at current $/m² rates
• Renovation: scope-adjusted cost based on how much of the existing structure you're keeping

RENOVATION SCOPES
• Cosmetic — paint, floors, fixtures, kitchen and bathroom updates
• Partial — structural changes to some rooms, new layout in parts of the home
• Major — full reconfiguration, additions, new floor levels

WHEN KDR WINS
If you're increasing size significantly, the existing structure is compromised, or renovation complexity drives costs up — a knockdown rebuild often comes out cheaper and gives you a brand-new home.

When renovation wins, you'll see that too.

Built by Buildana, a Sydney-based custom home builder and developer. We specialise in knockdown rebuilds across Western Sydney, Sydney, and surrounding areas. Visit buildana.com.au/homes/knockdown-rebuilds for project examples and pricing.

All estimates are indicative and based on current Sydney market data. Verify with a licensed builder before committing.