The Real Numbers Behind a Knock Down Rebuild
If you're considering a knock down rebuild (KDR) in Sydney, the first question is always: how much will it actually cost? Online estimates vary wildly — from $500K to $1.5M+ — because every project is different. Here's a realistic breakdown based on what real homeowners have spent.
Typical Cost Range (2024/25)
| Component | Budget | Mid-Range | High-End |
|---|---|---|---|
| Demolition | $15K–$30K | $20K–$40K | $30K–$60K |
| Site prep & excavation | $10K–$25K | $20K–$40K | $30K–$60K |
| Build (per m²) | $1,800–$2,200 | $2,500–$3,500 | $3,500–$5,500 |
| Landscaping | $10K–$25K | $30K–$60K | $60K–$150K |
| Council & approvals | $5K–$15K | $10K–$20K | $15K–$30K |
| Total (250m² home) | $500K–$700K | $750K–$1.1M | $1.1M–$1.8M+ |
Hidden Costs Most People Miss
- Temporary accommodation — 10–14 months of rent while your home is being built. Budget $30,000–$60,000+ depending on your family's needs.
- Soil and survey reports — Geotechnical reports, contour surveys, and arborist reports can run $3,000–$8,000 before you even start design.
- Service disconnection & reconnection — Gas, water, sewer, electricity, and NBN disconnection/reconnection costs $5,000–$15,000.
- Variations during build — The average KDR sees 5–15% in variations. On a $900K build, that's $45K–$135K.
- Holding costs — Council rates, insurance, and loan interest continue during the build period.
How to Reduce Costs Without Cutting Corners
- Get a fixed-price contract — protects against most variations (but read the fine print on allowances)
- Keep the footprint simple — every corner, angle, and split level adds cost
- Choose a KDR specialist — they know the pitfalls and price accurately
- Lock in selections early — changing tiles or fixtures mid-build triggers expensive variations
What Real Homeowners Say
The biggest surprise most homeowners report isn't the build cost itself — it's the timeline. Council approvals alone can take 3–6 months. The entire process from decision to moving in typically runs 18–24 months.
Want to see exactly what real homeowners spent on their KDR — with full cost breakdowns, timelines, and lessons learned?
See real numbers from real homeowners
Browse properties on BuildPeek to see actual cost breakdowns, timelines, and builder reviews from homeowners who've completed their projects.