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Quantum Finance Australia

Knockdown rebuild Perth

Knocking down and rebuilding in Perth, financed from demolition to the final drawdown

A knockdown rebuild loan funds the demolition of your existing house and the construction of a new one on the same block. Quantum Finance structures it around the costs that sit outside the building contract, starting with the demolition itself.

  • Demolish the house you own and build again on the same block.
  • The land is valued as vacant, and the new house as if complete.
  • Demolition, service disconnection and asbestos sit outside the contract.
  • Equity in the existing property often funds much of the project.
Justin Richardson turned back in his chair at his desk in the open-plan Quantum Finance office
Years broking
21+Years broking
Loans settled
$1B+Loans settled
Credit licence
ACL 389083Credit licence
Lenders compared
40+Lenders compared

Our awards and recognition

Awarded by the people who see every broker’s numbers
  • Diamond Club

    2026

    Money Quest Group

  • Diamond Club

    2025

    Money Quest Group

  • Diamond Club

    2024

    Money Quest Group

  • Mortgage Broker of the Year

    2023/24 — National, highest dollar volume settled

    Southern Cross Broker Network

  • Excellence in Finance, Gold

    2021

    PLAN Australia

  • Excellence in Finance, Gold

    2020

    PLAN Australia

  • Hall of Fame

    Valued partner, 15 years

    PLAN Australia

  • Elite Broker

    2021

    Broker Value Proposition

  • Premium Broker

    ANZ

  • Individual Excellence Award

    2016

    Specialist Finance Group

  • Sales Excellence Award

    PLAN Australia

  • Sales Master Award

    PLAN Australia

  • Top 100 Brokers

    Four times

    Australian Broker

What our knockdown rebuild service does

The work we do on a rebuild, from demolition to conversion

A knockdown rebuild loan funds demolishing the house you own and building a new one on the same block. The work is structuring the finance around what the building contract excludes, releasing the existing mortgage into the new facility, and holding the drawdowns to schedule.

Lenders value the land as vacant and then value the property as if the new house is complete, which is what sets the size of the facility.

Every facility is subject to lender approval and your circumstances, and we say where a project sits before anything is submitted.

  • We price the rebuild against the renovation before you choose

    A rebuild and a major renovation are funded differently and cost differently to hold. We will not tell you which one to build. We will tell you what each path costs to fund, where the money has to come from, and which one a lender is likely to support.

  • We establish what your existing property is worth first

    The whole project usually turns on the equity in the block you already own. Lenders value the land as if vacant, then value the property as if the new house is complete. Both numbers decide the size of the facility, so we get them settled at the start.

  • We fund the costs the building contract leaves out

    Demolition is the obvious one, and it is rarely inside the builder's fixed price contract. Service disconnection, licensed asbestos removal and site works on a difficult block sit outside it too. We structure the finance around those items instead of leaving you to find the cash.

  • We plan for where you live during the build

    You cannot live in the house while it is being demolished and rebuilt. Rent and any remaining mortgage run alongside each other for the length of the build, and that overlap belongs in the budget from the beginning. We work out what it looks like before anything is committed.

  • We manage the drawdown cycle once the slab goes down

    Your builder issues a progress claim, the lender usually sends a valuer to confirm the stage is complete, you sign an authority, and the lender pays the builder. That repeats at each stage of the new house. We keep it moving so the site does not sit idle.

  • We deal with the existing mortgage as part of the plan

    Most rebuilds start with a loan already secured against the house being demolished. That facility has to be restructured or replaced as part of the project rather than treated separately. We handle both halves in one conversation, subject to lender approval.

Work out the numbers on a rebuild

Duty if you are buying the block, then the repayment on the finished loan

If you are buying an older house to replace it, transfer duty applies to that purchase like any other. If you already own the block there is no duty to pay, and the number that matters is what the loan repays at once the final drawdown is made.

Work out your WA stamp duty

The dutiable value. Usually the contract price, or the market value if that is higher.

Who is buying

First home buyer rates apply only if nobody on the contract has owned a home in Australia before, and you move in.

What you are buying

Foreign buyers pay an extra 7% of the dutiable value on residential property in WA.

Rates as at 10 August 2026, source: RevenueWA.

Estimated duty payable

$24,890

Scale applied
General rate
Transfer duty
$24,890
Duty at the general rate
$24,890

This is an estimate of transfer duty only, on the 10 August 2026 RevenueWA scale. It does not include Landgate transfer or mortgage registration fees, settlement agent fees, or the off-the-plan concession. RevenueWA assesses the final figure.

Talk through your purchase costs

Each tool has a page of its own explaining every figure it uses: stamp duty calculator wa and home loan repayment calculator.

Who a knockdown rebuild loan suits

The rebuilds we arrange finance for

Every project below replaces an existing house on a block the owner is keeping. These are the situations that arrive most often.

  • Owners who like their street and have outgrown their house

  • Buyers who have bought an older house on a good block to replace it

  • Families weighing a rebuild against extending what they have

  • Owners on a sloping or narrow block where site works matter

  • Anyone whose existing mortgage has to be dealt with as part of the plan

How the process runs on a rebuild

Five steps to approval, then demolition and the drawdowns

The application runs the same five steps as any loan we write. On a rebuild the site is then cleared before the first construction stage begins, and each stage after that runs on a progress claim, a valuation, an authority and a payment.

  1. Start an application

    You send us the basics and we work out what you could borrow and which lenders will look favourably at your situation.

    What you need

    Income, debts, deposit

    Read this step in full: Start an application
  2. Get pre-approved

    We put your file to the lender that fits and bring back a pre-approval in writing, subject to lender approval and your circumstances.

    What we do

    Match the lender to your file

    Read this step in full: Get pre-approved
  3. Get officially approved

    Once your offer is accepted, the lender orders its valuation and issues formal approval.

    What we do

    Chase the lender, so you do not have to

    Read this step in full: Get officially approved
  4. Prepare for settlement

    We go through the loan documents with you before you sign anything, then coordinate the lender and your settlement agent.

    What you need

    Your questions, asked early

    Read this step in full: Prepare for settlement
  5. Stay up to date

    After settlement we keep the loan under review as rates move and your circumstances change.

    What we do

    Review it, and tell you first

    Read this step in full: Stay up to date

Step 1 of 5

About our independent mortgage brokers

The brokers who fund your rebuild

Independent means no franchise above us and no lender owning a share of the business. Nobody upstairs sets a monthly target, so a rebuild goes to the lender whose policy handles demolition and existing security properly. Your bank sells one construction product; we compare 40+.

Gavin Harrigan has been broking from West Leederville since 2005. Today it runs on a small team, Gavin Harrigan, Justin Richardson and Xavier Prescott, each with their qualifications on the page. You deal with the person who writes your loan, before settlement and after it.

The work runs from a first home loan, through refinancing and investment lending, out to construction, small developments and commercial property. Same broker, whichever end of that you are at.

  • VerifiedBroking since 2005
  • VerifiedOver $1 billion in loans settled
  • VerifiedAustralian Credit Licence 389083
  • VerifiedMoneyQuest accredited
  • VerifiedMember of the Finance Brokers Association of Australia (FBAA)
  • Verified40+ lenders on the panel

Fifteen minutes is usually enough to tell you where you stand. No cost, no obligation, and any lending is subject to approval and your circumstances.

The Quantum Finance broking team at their West Leederville office in Perth
Gavin Harrigan at his desk at the Quantum Finance office in West Leederville, industry awards on the wall behind him

Why choose us for a knockdown rebuild

Demolishing your security is the part a lender has an opinion about

Every point below is a consequence of how this business is owned, not a slogan about service.

  • Included

    No franchise, no head office quota

    We do not pay a franchise fee, so nobody upstairs sets a monthly target for us to hit. That removes the main reason a broker recommends the wrong loan.

  • Included

    No lender owns a share of us

    The banks have no stake in this business and no claim on where files go. Your bank has one loan to sell you. We do not.

  • Included

    40+ lenders, one shortlist

    We compare 40+ bank and non-bank lenders, then explain why the shortlist looks the way it does. Policy differences decide more applications than rate does.

  • Included

    We will tell you when the answer is no

    If refinancing does not actually save you money, we say so and you leave the loan where it is. A wrong loan costs more than the fee it earns.

  • Included

    The same broker after settlement

    You keep dealing with the person who wrote the loan. We review it as rates and your circumstances change, not once and then never again.

Book a 15-min chat

What our clients say

In their words, not ours

Reviews left by people we have settled loans for, pulled straight from the platform they were written on.

Our construction lender panel

Rebuild policy differs by lender, so we compare 40+

Major banks, second-tier banks, and non-bank lenders who will look at a build the majors will not. MoneyQuest gives us access to the panel. 21+ years of writing loans on it tells us which lender to use.

  • ANZ
  • Commonwealth Bank
  • NAB
  • Westpac
  • St.George
  • Bankwest
  • Suncorp Bank
  • ING
  • Citi
  • Macquarie
  • AMP
  • ME Bank
  • P&N Bank
  • Firstmac
  • Homeloans
  • La Trobe Financial
  • Liberty
  • Pepper Money
  • Bluestone
  • PLAN Lending

A selection of the lenders we are accredited with. Ask us who else is on the panel for your situation.

Meet our Perth construction finance brokers

You get a broker, not a call centre

Three people, all named, all reachable. The person who structures your rebuild is the person who deals with your existing mortgage and the person who chases every drawdown after demolition.

  • Gavin Harrigan, Managing Director of Quantum Finance Australia in Perth

    Gavin Harrigan

    Managing Director

    Broking since 2005, four-time Top 100 broker and a PLAN Australia Hall of Fame member.

    • Bachelor of Commerce, Applied Finance and Commercial Law — Curtin University
    • Diploma of Finance and Mortgage Broking Management — AAMC Training Group
    • PLAN Australia Hall of Fame member
    • Elite Broker status
    • Top 100 Brokers, four times
    Read profilefor Gavin Harrigan
  • Justin Richardson, Loan Consultant at Quantum Finance Australia

    Justin Richardson

    Loan Consultant

    Business and law background, and a habit of making the process feel simple.

    • Bachelor of Commerce, Business Law and Marketing — Curtin University
    • Bachelor of Laws (in progress) — Murdoch University
    Read profilefor Justin Richardson
  • Xavier Prescott, Loan Consultant at Quantum Finance Australia

    Xavier Prescott

    Loan Consultant

    Fresh qualifications, a competitor's discipline, and a lot of patience.

    • Diploma of Finance and Mortgage Broking Management
    Read profilefor Xavier Prescott

Common questions about knockdown rebuild finance in Perth

How does finance for a knockdown rebuild work?

It is a construction loan over a block you already own. The lender values the land as if vacant, then values the property as if the new house is complete, and sizes the facility against both. Money is released in stages as the new house goes up, with interest on the drawn balance.

Does the loan cover the demolition?

Demolition sits outside most fixed price building contracts, so it is not automatically funded. It can often be built into the overall facility, but only if the finance is structured for it from the start. Raise it in the first conversation rather than after the contract is signed.

Can I use the equity in my existing house?

Usually yes, and on most rebuilds it is what makes the project possible. Lenders assess the equity against a current valuation of the land as vacant, alongside your serviceability. How much of it can be used depends on the lender's policy, subject to approval.

What happens to my existing mortgage?

It has to be dealt with as part of the project rather than left running beside it, because the security is being demolished. In practice the existing facility is restructured or replaced by the construction loan. We handle both halves in the same application.

Where do I live while the house is being built?

Somewhere else, for the length of the build. Rent and any remaining loan repayments run at the same time, and repayments climb with each drawdown. That overlap is the cost most people underestimate, so we put a number on it before the project starts.

Is a knockdown rebuild cheaper than renovating?

Neither is cheaper as a rule, and anyone offering you a rule of thumb is guessing. It depends on the condition of the house, the work you want done and what a builder quotes for each path. Get both costed, then we will tell you how each one funds.

What about asbestos in the old house?

Asbestos removal is licensed work and sits outside most building contracts, so it is quoted and paid for separately. Have the house assessed before you set a budget rather than after demolition is booked. It is one of the costs a rebuild budget most often misses.

The information on this page is general in nature and does not take into account your objectives, financial situation or needs. Any figures shown are estimates only. Lending is subject to approval, and to the lender's terms, conditions, fees and charges. Consider whether the information is appropriate for you before acting on it.

Get in touch

Talk to us before you commit to a rebuild

Four questions and you are done. A broker reads it, works out what your equity supports, and rings you back on the number you give us.

Would rather just talk?

Ringing is quicker than waiting for us to ring you, and you get a broker rather than a queue.

1300 813 113

Tell us what you need

Four details, about twenty seconds. We ask the rest on the call, where you can ask us things back.

An Australian mobile or landline. Overseas? Give us the number you use at home and we will work around the time difference.

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