If you own an older home in a suburb you love, but the house itself no longer works for your family, you’ve probably asked this question: how much will it cost to knockdown rebuilt in Perth?
So, typically, a knock down rebuild costs between $400,000 and $800,000+, depending on your home size, finish level, and site conditions.
But that number alone won’t protect your budget. There are demolition costs, council permits, hidden site expenses, and post-build landscaping that most Perth homeowners never factor in, until the bills arrive.
This guide breaks down every cost involved in a knockdown rebuild in Perth in 2026, so you know exactly what to expect from start to finish.
What Is a Knock Down Rebuild – Why Are Perth Homeowners Choosing It?
A knock down rebuild (KDR) is demolishing your existing home and building a brand-new one on the same block of land. Same location. Fresh start.
It’s become one of the most popular housing decisions in Australia. Up to 30% of homes are now demolish-and-rebuild projects, largely driven by the desire to live in densely populated areas like Perth. And it’s not hard to see why.
Perth’s established suburbs are full of homes built in the 1970s and 1980s. The land is valuable. The neighbourhood is desirable. But the house? Often outdated, inefficient, and expensive to fix properly. That’s where a knockdown and rebuild lets you stay in the street you love while getting a home that’s actually built for how you live today.
How Much Does It Cost to Knock Down Rebuild a House in Perth?
In 2026, the total knock down rebuild cost in Perth typically falls between $400,000 and $800,000+ for a standard to mid-range home. Luxury builds or larger homes can reach $1 million and beyond.
That figure covers far more than just construction. Here’s the full picture:
Knockdown and Rebuild Costs in Perth: 2026 Price Breakdown
| Cost Component | Price Range |
| Demolition | $15,000 – $40,000 |
| New home construction | $2,000 – $4,000/sqm ($300,000 – $600,000+) |
| Site works (earthworks, drainage, retaining walls) | $15,000 – $40,000 |
| Council fees and permits | $3,000 – $8,000+ |
| Landscaping and external works | $10,000 – $80,000 |
| Utility disconnection and reconnection | $3,000 – $10,000 |
| Temporary accommodation (6–18 months) | $20,000 – $60,000+ |
| Luxury inclusions and customisations | $600,000 – $1,000,000+ |
| Estimated total | $400,000 – $800,000+ |
Important: Always add a 10–15% contingency buffer to your knock down rebuild budget. Unexpected site conditions, council resubmissions, and design variations are common, and they add up fast.
Every project is different, and the costs above are influenced by a range of site-specific factors. Let’s look at what drives the final price up or down.
What Affects Knock Down Rebuild Costs in Perth?
Two knock down rebuild projects in Perth can vary by hundreds of thousands of dollars. Here’s why:
- Block Size and Slope: Flat blocks are cheaper. Blocks with slopes need to build retaining walls and perform earthworks that can cost between $10,000-$30,000 for you.
- Soil Types: If you have reactive soils, expect to spend money on deeper foundations, thus adding to your structural budget even before laying a single wall.
- Home Sizes: While the bigger the home the higher the costs, the costs per square meter fall with an increase in floor area.
- Single Storey vs. Double Storey: Double stories are expected to cost between 15-25% more than single-storey structures. This is due to higher complexity in structure, stairway construction, and other considerations.
- Demolition requirements: The cost of demolition will vary with factors such as the nature of the property, presence of hazardous material, and ease of access to the site, with asbestos being one of the main factors behind rising costs.
- Design Complexity: A typical project home is much cheaper compared to a completely customized design that may include architectural elements, high ceilings, or anything unusual.
- Home Builder Selection: Hiring an established builder that offers a firm price contract saves you from budget blowouts. You must check all the inclusions before entering into a contract.
- Suburb and Council: Each council in Perth has its own process and costs for approvals. It will be wise to choose a builder who understands your council very well.
- Luxury Upgrades and Finishes: High-quality finishings like premium cabinetry, engineered stone bench tops, timber flooring, and top-of-the-line tapware are not usually in base prices.
Now that you understand what shapes the total cost, let’s break down each major component, starting with demolition.
Cost to Demolish a House in Perth
The demolition of the existing structure will have to occur first before any construction takes place. In Perth, the average house demolition price will usually be around $20,000 – $25,000, though in most cases, it might end up being $30,000 – $40,000.
The basic components of most Perth demolition quotes are:
- Demolition permit application
- Utility capping (water, gas, electricity, sewer, NBN)
- Complete site clearance & waste removal
- Recycling & waste disposal
Factors that will raise the cost of demolition in Perth:
- Size of the house: Most demolition companies charge based on the size (square meters), so bigger houses will definitely be more expensive
- Materials: Structures that use brick & concrete will be more costly compared to wooden buildings; however, wood is salvageable material, reducing costs
- Site accessibility: Narrow lots & streets in inner suburbs require specialized equipment & will be done at a slower pace
- Asbestos: Houses built before 1990 contain asbestos & require licensed professionals in accordance with WorkSafe WA guidelines – $5,000 – $30,000+
- Beyond the main structure: pools, garden shed, pergola, and old retaining walls increase the difficulty level
Perth-specific fact: Council demolition permits usually take approximately 20 working days to obtain. This will be taken care of by your contractor.
Tip: There is nothing stopping you from organising the demolition contractor yourself, but you’ll get better rates through your builder. You’ll also know that the demolition contractor is reliable and can handle the specifics of the job.
Once the site is cleared and ready, the real excitement begins, and that’s building your new home.
New Home Construction Costs in Perth After Demolition
The construction cost is the largest single line item in your knockdown rebuild budget. In Perth, build costs per square metre vary based on the type and finish of your home:
| Home Type | Cost Per Sqm (2026) |
| Standard project home | $1,500 – $2,000/sqm |
| Mid-range custom home | $2,000 – $2,500/sqm |
| High-quality or luxury custom | $2,500 – $3,500+/sqm |
Example: A custom-made medium-range 200 sqm two-storey house in Perth will have construction costs alone of around $400,000–$500,000. Without including demolition costs, land preparation, and landscaping services.
Factors that affect your building costs include:
- Storey type: Building a two-storey home increases the intricacies of designing and engineering. Hence, it costs an extra 15–25% per square meter compared to a single-storey structure.
- Materials and finishes: Materials like engineered stone, hardwood floors, high-end tap fittings, and custom joinery make building more expensive.
- Energy Efficiency: In Western Australia, a 6-star NatHERS energy rating is the bare minimum for newly constructed buildings. Therefore, some property owners opt to go beyond this by investing in solar panels, better insulation, and superior glazing.
- Design customisation: A fully custom architectural design costs more than a builder’s off-the-shelf floor plan
At PDCD Homes, we offer a full range of single-storey and double-storey custom home designs across Perth. They’re built to your brief, your budget, and Western Australian building standards.
With construction costs now clear, there’s one more area that catches many Perth homeowners off guard: the hidden costs.
Hidden Costs of a Knock Down Rebuild in Perth (Don’t Get Caught Out)
This is where budgets go wrong. Most builders quote on the visible work — demolition and construction. But a knockdown rebuild comes with a long list of additional costs that aren’t always front and centre.
Here’s what to budget for:
- Asbestos removal: Homes built before 1990 mostly contain asbestos in roofing, walls, eaves, or flooring. In WA, removal must be carried out by a licensed contractor. Cost: $5,000–$30,000+ depending on the amount and type.
- Soil testing and site surveys: Required both before demolition and before construction. Expect $1,500–$5,000 across the project.
- Underground surprises: Old footings, tree roots, and other things underground should be removed before a rebuild. This can add to the cost.
- Utility disconnection and reconnection: Electricity, gas, water, sewer, and NBN all should be disconnected before demolition. Then, they’re reconnected once the new home is ready. Budget $3,000–$10,000+ for these fees.
- Temporary accommodation: You cannot live on site during a knockdown rebuild. With a typical Perth project taking 8–18 months, renting during construction is one of the most underestimated budget items. Budget $20,000–$60,000+ depending on your situation.
- Post-build landscaping and external works: Post-build costs are needed for a new driveway, paths, fence and gates, retaining walls, turf, gardens, irrigation systems, exterior lighting, a letterbox, and repair of any boundary fences damaged during demolition. These finishing touches can add from $10,000 to more than $80,000.
- Design variations during construction: Changes made after permits are lodged or during the build add cost and cause delays. Finalise your design before breaking ground.
- Council resubmission fees: If your plans require changes after submission, additional assessment fees apply.
The best protection against all of this? A fixed-price contract with a builder who knows Perth council requirements inside out. And a 10–15% contingency set aside from day one.
At PDCD Homes, knock down rebuild experts handle the permits, manage the approvals, and keep your project on schedule. You focus on the design; we manage the paperwork.
How to Finance a Knock Down Rebuild in Perth
Most standard home loans don’t cover a knock down rebuild, and if you have an existing mortgage, the process requires careful planning.
The primary ways that construction can be financed include the following:
- Construction loan: This is the most popular choice. Payments are disbursed progressively at slab, frame, lock-up, fit-out, and completion stage. Such staged payments are normally made upon the commencement of the contract, upon the installation of slabs, on completion of the frame of the house, on the lockable stage of the house, on the completion of fit-out and completion of construction.
- Equity Redraws: If there has been a large reduction in your current mortgage, this might allow you to withdraw funds for the entire construction work.
- Cash: An easy way to finance construction without having any loan-related expenses.
- Bridging loan: In case you are planning to sell your current house and construct another one.
Important: Many standard mortgages won’t cover demolition and rebuild costs, and if the home you’re demolishing has a current mortgage there may be other factors to consider, so exploring these specialised options and talking with a finance specialist is essential.
At PDCD Homes, we can point you in the right direction and help you understand your finance options from day one.
Is a Knock Down Rebuild Worth It in Perth?
For most Perth homeowners in established suburbs, the answer is yes, especially when the existing home needs serious work.
It’s clearly worth it when:
- Your land is in a high-value, established Perth suburb
- The existing home needs major structural repairs, rewiring, replumbing, or asbestos removal
- You want full design freedom like layout, finishes, and size all tailored to your life
- You want the certainty of a fixed-price contract and builder warranty
The long-term upside is real. A new, well-designed home in a desirable Perth suburb can significantly increase your property’s value. In one past project, a client knocked down and rebuilt a home that they later sold a few years after completion, achieving a return on investment of over 60%.
Knockdown Rebuild Advantages
- Live where you are, in your favourite suburb and street
- Single or Double Storey Design, designed especially for you
- Complies with all building regulations for 2026: energy saving, insulation, up-to-date equipment
- The full builder’s guarantee on materials, structure and work
- Fixed price contract, no hidden costs
Curious about what your knock down rebuild will cost?
Build Your Dream Home with Perth’s Experts in Knock Down Rebuilds
PDCD Homes is an award-winning home builder based in Perth, and a member of Master Builders WA and HIA. We design single-storey and double-storey homes to suit your needs, and we take care of everything in your knock down rebuild project, from the first consultation and design all the way to council permits, demolition, building, and completion.
Whether you’re in Karrinyup, Claremont, Scarborough, or anywhere across Perth. We’ll assess your block, walk you through the realistic costs, and help you make the right decision for your family and your budget.
FAQs
- What is the average knock down rebuild cost in Perth?
The average knock down rebuild cost in Perth ranges from $400,000 to $800,000+, depending on home size, finishes, and site conditions. This includes demolition ($15,000–$40,000), new home construction ($2,000–$4,000/sqm), site works, council fees, and landscaping.
- Is a knock down rebuild cheaper than renovating in Perth?
For a major renovation on an older Perth home, the costs can reach $300,000–$500,000. And you still end up with an old, compromised structure. A knock down rebuild at $550,000–$650,000 gives you a brand-new home built to 2026 standards, with a builder warranty and a fixed price.
- How much does it cost to demolish a house in Perth?
Demolition in Perth costs $15,000–$40,000 for a standard home. Costs increase with house size, difficult site access, heavy materials like brick or concrete, and most importantly, the presence of asbestos.
- How long does a knock down rebuild take in Perth?
The knock down rebuild process for Perth will require an average period of 8 to 16 months. This period consists of 4 to 8 weeks of planning and designing, 20 working days of getting the demolition permit issued, 4 to 8 days of demolition, 25 business days of construction permits, and 6 to 12 months of construction.
- Do I need council approval for a knock down rebuild in Perth?
Yes. A knock down rebuild requires both a demolition permit (processed by your local council, approximately 20 working days) and a building permit (BA2 application, approximately 25 business days). If asbestos is present, additional WorkSafe WA permits are required. A specialist builder will manage most of this approval process on your behalf.
- Does a knock down rebuild increase property value?
Yes, in most cases. The construction of a new custom-built home in an existing, upscale area of Perth will usually increase the overall value of the property. The use of modern design and high-quality materials enhances the attractiveness of the property for any future buyer.
- Is a knockdown rebuilding more cost-effective than extending an existing home in Australia?
It depends on the scope of the extension and the age of the home. A large rear or second-storey extension on an older home often triggers requirements to upgrade electrical, plumbing, and structural elements. This pushes costs close to or beyond what a full rebuild would cost.
