Knock Down Rebuild Australia
Your complete resource for knock down rebuild projects across Australia. Compare specialist builders, understand costs, navigate council approvals, and make informed decisions.
A knock down rebuild (KDR) means demolishing your existing home and building a brand new one on the same block of land. You stay in the suburb you love — close to schools, work, and community — while getting a modern, energy-efficient home designed for how your family lives today. In Australia, knock down rebuilds are increasingly popular in established suburbs where land is expensive but the existing housing stock is ageing.
Not sure whether a knock down rebuild or a renovation is the right choice? Understand your site constraints first, then compare specialist KDR builders using Compare My Build.
Why Choose a Knock Down Rebuild?
Stay in Your Preferred Location
A knock down rebuild lets you keep the location you love — close to schools, work, family and community — while getting a brand new home designed for modern living.
Avoid Renovation Hassles
Renovating an older home often reveals hidden problems — asbestos, rising damp, outdated wiring. A knock down rebuild gives you a clean slate with a brand new structure and full warranties.
Modern Design & Energy Efficiency
New homes meet current 7-star energy ratings, meaning better insulation, lower energy bills, and more comfortable living year-round compared to older homes.
Increase Property Value
A new home on an established block can significantly increase your property's value, often outperforming the cost of a major renovation.
Customise Your Floor Plan
Unlike buying an established home, a knock down rebuild lets you choose your layout, inclusions, and finishes — tailored to your family's needs.
Lower Ongoing Maintenance
New homes come with new appliances, new plumbing, new wiring, and structural warranties — meaning decades of lower maintenance costs.
Knock Down Rebuild vs Renovation: Which Makes Sense?
The decision between a knock down rebuild and a renovation comes down to the condition of your existing home, your budget, and what you want to achieve. Here's how the two options compare across common scenarios:
| Scenario | Knock Down Rebuild |
|---|---|
| Your home has structural issues | A KDR gives you a brand new structure with full warranties — no hidden surprises. |
| You want a completely new layout | You can design any floor plan that fits your block and council controls. |
| Your home has asbestos or outdated wiring | Demolition removes all hazardous materials in one controlled process. |
| You want 7-star energy efficiency | A new build meets current 7-star standards — better insulation, lower bills. |
| Your home is in good condition and you love its character | Demolishing a character home you love may not make sense. |
| You're working with a tight budget | A KDR is a larger investment ($350,000–$900,000+) but delivers a brand new home. |
The Knock Down Rebuild Process
Feasibility & Site Assessment
A builder assesses your block — size, slope, soil, access, and any easements or overlays — to confirm a knock down rebuild is viable and provide initial cost estimates.
Demolition
The existing home is demolished and removed. This includes hazardous material removal (like asbestos), service disconnections, and site clearance. Typically takes 1–2 weeks.
Design & Approvals
Work with your builder to finalise the floor plan and inclusions. The builder lodges plans with council or a certifier for development approval and construction certificates.
Construction
Your new home is built — from slab and frame to lock-up and fit-out. The build process is the same as a new home build, typically taking 6–12 months depending on design complexity.
Handover
After practical completion inspection and any rectifications, you receive the keys to your brand new home in the location you already love.
Demolition & Site Considerations
Demolition and site conditions are where knock down rebuild costs can vary most. Understanding these factors upfront helps you compare builders accurately and avoid budget blowouts. For a deeper dive, see our guides on site costs explained and slab classifications.
Asbestos removal
Homes built before 1990 commonly contain asbestos. A licensed asbestos removalist must handle and dispose of it safely. This adds $5,000–$15,000 to demolition costs.
Service disconnections
Gas, water, electricity, and sewer must be disconnected before demolition and reconnected for the new build. Budget $2,000–$10,000 across the project.
Site access
Narrow blocks, tight side access, or overhead power lines can restrict machinery access and increase demolition and site works costs.
Soil classification and slope
Reactive clay (H1/H2) or a sloping block can add $20,000–$50,000+ in slab engineering and earthworks. Always ask what soil class your site cost estimate assumes.
Tree and vegetation removal
Existing trees may require council approval to remove, and root systems can affect slab design. Check council tree protection orders early.
Retaining structures
If your block has existing retaining walls, fences, or a pool you want to keep, the builder needs to plan demolition around them.
Knock Down Rebuild Costs
| Cost Component | Price Range |
|---|---|
| Demolition & site clearance | $15,000 – $40,000 |
| New home construction | $300,000 – $800,000+ |
| Site costs (slab, earthworks) | $20,000 – $50,000 |
| Council approvals & certifications | $3,000 – $15,000 |
| Utility connections & disconnections | $2,000 – $10,000 |
| Total project cost | $350,000 – $900,000+ |
What Affects the Cost of a Knock Down Rebuild?
The total cost of a knock down rebuild isn't just the new home's build price. Several factors can move your budget by tens of thousands of dollars — understanding them upfront helps you compare builders accurately. For a full breakdown of slab and earthworks costs, see our guide to site costs and our raft slab vs waffle pod guide.
Demolition & site clearance
Home size, access for machinery, and asbestos or hazardous material removal all affect the demolition cost. Asbestos can add $5,000–$15,000.
Site costs (slab & earthworks)
Soil classification, slope and block conditions drive slab engineering. Reactive clay or a sloping block can add $20,000–$50,000+ over a flat, stable site.
Temporary accommodation
You'll need to rent elsewhere for the duration of the project — typically 6–12 months. Factor rental costs into your total budget or financing.
Utility disconnections & reconnections
Gas, water, electricity and sewer services must be disconnected for demolition and reconnected for the new build. Budget $2,000–$10,000.
Council approvals & certifications
Development applications, construction certificates and demolition permits vary by state and council — typically $3,000–$15,000.
Inclusions & upgrades
The new home's inclusions — ceilings, benchtops, flooring, air conditioning, driveway — vary enormously between builders. Compare them side by side to avoid paying for upgrades another builder includes.
How Long Does It Take?
Demolition
1–2 weeks
Design & council approvals
8–16 weeks
Construction
6–12 months
Total project timeline
8–14 months
Financing Your Knock Down Rebuild
Construction Loans
Most knock down rebuild projects use a construction loan, which releases funds in stages as the build progresses. You only pay interest on drawn funds during construction.
Using Your Equity
If you have equity in your existing property, you may be able to release it to fund the demolition and construction. A mortgage broker can help structure this.
Demolition Costs in the Loan
Many lenders include demolition costs in the total loan amount, so you don't need separate funding for the knock-down phase.
Bridging Finance
If you need to relocate during construction, bridging finance can cover rental costs alongside your mortgage during the build period.
Council Approvals
Development Application (DA)
In most states, a DA is required from your local council. This assesses the proposed home against planning controls — height, setback, site coverage, and heritage or environmental overlays.
Complying Development / Fast-Track
Some states offer fast-track approvals (like CDC in NSW) for projects that meet specific criteria, bypassing the full DA process and saving weeks.
Construction Certificate
After DA approval, a construction certificate confirms the plans comply with the Building Code of Australia before building work begins.
Demolition Permit
A separate demolition permit is required before the existing home can be removed. This ensures safe removal of hazardous materials and proper site management.
Choosing a Knock Down Rebuild Builder
Not every builder who builds new homes is experienced with knock down rebuilds. A KDR adds demolition, service disconnections and a tighter approval pathway. Use Compare My Build to compare specialist KDR builders' inclusions and warranties side by side. For guidance on contract types, see our guide to fixed-price vs cost-plus contracts.
Specialist KDR experience
Choose a builder with completed knock down rebuild projects, not just new-home builds. Ask to see recent KDR work and speak to past clients if possible.
Fixed-price site costs
A builder confident in your block should offer fixed-price site costs or a tight provisional sum. Vague site cost estimates are the most common cause of budget blowouts on a knock down rebuild.
Transparent inclusions
Compare standard inclusions side by side — ceilings, benchtops, flooring, air conditioning, driveway and more — so you know what's included before you sign.
Local council knowledge
A builder experienced with your local council's planning scheme and approval pathway can save weeks in the approvals stage and avoid costly redesigns.
Structural warranty
Confirm the structural and independent warranty cover and how long it lasts. A new build should come with a structural warranty that renovations can't always match.
Display homes
Visit a display home to assess build quality and finish firsthand, then compare that builder's inclusions against others on Compare My Build.
Questions to Ask a Knock Down Rebuild Builder
- How many knock down rebuild projects have you completed in the last 12 months?
- What soil class does your site cost estimate assume, and is the slab included or a provisional sum?
- Do you offer fixed-price site costs, or can these vary after I sign?
- What's included as standard in the base price — ceilings, benchtops, flooring, air conditioning, driveway?
- How long will the approvals and construction take for a block like mine?
- What warranty do you provide, and is it independent or builder-backed?
- Who manages the demolition permit, hazardous material removal and service disconnections?
- Can I see a completed knock down rebuild project similar to what I'm planning?
Frequently Asked Questions
A typical knock down rebuild costs between $350,000 and $900,000+ depending on the size of the new home, site conditions, demolition requirements, and your chosen inclusions. Demolition alone typically costs $15,000–$40,000, with the new build starting from around $300,000.
Knock Down Rebuild Articles
What Is a Knock Down Rebuild?
A knock down rebuild (KDR) is the process of demolishing an existing home and constructing a brand new one on the same block of land. It's an increasingly popular alternative to renovating or buying a new home in a different suburb.
Read More
ComparisonsKnock Down Rebuild vs Renovation: Which Is Right for You?
Deciding between a knock down rebuild and a renovation is one of the biggest decisions a homeowner faces. This guide compares the costs, timelines, and outcomes of each to help you decide.
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CostsKnock Down Rebuild Costs: The Complete Price Guide
Understanding the full cost of a knock down rebuild is essential before starting. This guide breaks down every cost component — from demolition to handover — so you can budget with confidence.
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ProcessKnock Down Rebuild Timeline: How Long Does It Take?
A knock down rebuild is a multi-stage project that typically takes 8–14 months from start to finish. This guide breaks down each phase so you know what to expect.
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PracticalCan I Live in My House During a Knock Down Rebuild?
The short answer is no — you cannot live in your home during a knock down rebuild. Here's what you need to plan for regarding accommodation during your project.
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CostsHow Much Does Demolition Cost in Australia?
Demolition is the first major expense in a knock down rebuild. This guide breaks down what demolition costs, what affects the price, and how to get the best quote.
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PracticalCan I Keep My Existing Pool During a Knock Down Rebuild?
In many cases, yes — you can keep an existing swimming pool during a knock down rebuild. Here's what you need to know about integrating a pool into your new build.
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PracticalCan I Keep My Garage During a Knock Down Rebuild?
Whether you can keep a garage or shed during a knock down rebuild depends on its type, condition, and location. Here's what you need to know.
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PracticalCan I Rebuild on a Sloping Block?
Yes, you can do a knock down rebuild on a sloping block — but it requires specialist builders and specific design approaches. Here's what you need to know.
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BuildersBest Knock Down Rebuild Builders in Australia
Choosing the right builder is the most important decision in your knock down rebuild project. This guide helps you identify and compare the best KDR builders.
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FinanceKnock Down Rebuild Finance Guide
Financing a knock down rebuild is different from a standard home loan. This guide explains your options — from construction loans to using your existing equity.
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ApprovalsKnock Down Rebuild Council Approvals
Council approvals are a critical part of any knock down rebuild. This guide explains the approval process, what you need, and how to navigate it efficiently.
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ChecklistsKnock Down Rebuild Checklist
A comprehensive checklist covering every stage of your knock down rebuild project, from initial feasibility to final handover.
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AdviceMistakes to Avoid During a Knock Down Rebuild
A knock down rebuild is a major project with many potential pitfalls. Here are the most common mistakes homeowners make — and how to avoid them.
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Knock Down Rebuild Builders
Builders across Australia that specialise in knock down rebuild projects.
Bennic Homes
VIC
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OJ Pippin Homes
QLD
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Allworth Homes
NSW
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Arcadia Homes
QLD
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Arden Homes
VIC
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Arden Vale Homes
QLD
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AUSMAR Homes
QLD
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Beachwood Homes
VIC
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Bellriver Homes
NSW
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Better Built Homes
NSW
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Bold Living
QLD
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Boutique Homes
VIC
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Brighton Homes
QLD, NSW
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Burbank Homes
QLD, VIC, ACT, SA
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Candor Homes
NSW
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Carlisle Homes
VIC
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Casaview Homes
NSW
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Champion Homes
NSW
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Clarendon Homes NSW
NSW
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Clarendon Homes QLD
QLD, NSW
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Coast Life Homes
QLD
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Coral Homes
QLD, NSW
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Crystele Homes
NSW
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CSB Homes
NSW
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Eagle Homes
NSW
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Eden Brae Homes
NSW
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Everyday Homes
NSW
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Fairhaven Homes
VIC
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Fowler Homes
NSW
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G.J Gardner Homes – Melbourne North West
VIC
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G.J. Gardner Homes – Gold Coast South
QLD
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Henley Homes
VIC
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Homes by CMA
QLD
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Homes By ZAC
NSW
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Hotondo Homes
QLD, ACT, NSW, TAS, VIC, SA
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Hudson Ridge Builders
VIC
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Indigo Homes
QLD
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JG King Homes
VIC
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King Homes
NSW
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Kingsbridge Homes
VIC
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Kline Homes
QLD, NSW
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Kookaburra Homes
SA
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Kurmond Homes
NSW
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Masterton Homes
NSW
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McCarthy Homes
QLD
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McDonald Jones Homes
ACT, NSW
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McLachlan Homes
QLD
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Meridian Homes
NSW
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Metricon Homes
QLD, SA, VIC, NSW
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Metro Homes
SA
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Metronest Homes
VIC
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MOJO Homes
NSW
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Montgomery Homes
NSW
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Neptune Homes
QLD, NSW
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New Living Homes
NSW
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Nostra Homes
VIC
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Omni Built Homes
QLD
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Omnia Homes
VIC
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Ownit Homes
QLD
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Plantation Homes
QLD
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Practical Homes
NSW
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Provincial Homes
NSW
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Rawson Homes
ACT, NSW
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Redink Homes
WA
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Ridgewater Homes
VIC
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Simonds Homes
QLD, VIC, SA
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SJD Homes
VIC
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Stroud Homes
QLD
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Stylemaster Homes
QLD
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Sundancer Homes
NSW
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Tullipan Homes
NSW
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Ultra Living Homes
QLD
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Vision Homes
NSW
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Vogue Homes
NSW
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Weeks Homes
SA
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Wisdom Homes
NSW
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Xircon Homes
VIC
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