What are Knockdown Rebuild Construction Loans

A knockdown rebuild construction loan funds the demolition of your existing home and the progressive build of a new one on the same block.

If you own a home in Margaret River that no longer works for you, knocking it down and starting again can make more sense than renovating or moving. Older weatherboard cottages near the town centre or dated brick homes closer to Gnarabup often sit on valuable blocks that justify the rebuild cost. The lending process is different from a standard home loan because the property loses value once demolished, and funds release progressively as the new build takes shape.

How Knockdown Rebuild Funding Differs from a Standard Home Loan

Lenders release funds in stages rather than as a single upfront amount. You draw down the loan in instalments as the builder completes each phase, from slab pour through to final fit-out. The lender usually appoints a quantity surveyor or building inspector to confirm each stage is complete before releasing the next payment. Until the new home reaches practical completion, you'll typically make interest-only repayments on whatever amount has been drawn down so far, rather than paying interest on the full loan from day one.

Consider a scenario where you own a 1970s brick home on half an acre near the Margaret River Golf Club. The house is structurally sound but outdated, and extending it would mean working around load-bearing walls and asbestos cladding. You decide to knock it down and build a four-bedroom home with a northern aspect. Your lender approves a loan amount based on the land value plus the cost to build. Once demolition is complete, the first drawdown covers site clearing and foundation work. A month later, the frame goes up and the next payment releases. By the time you reach lock-up stage, you've drawn down around 60% of the total loan and you're paying interest only on that portion.

What Lenders Want to See Before Approving the Loan

You'll need a fixed price building contract with a registered builder, council approval for the new dwelling, and enough equity or savings to cover the difference between your current property value and the total project cost. Most lenders require the builder to hold appropriate insurance and want to see a detailed construction draw schedule that breaks the build into clear stages with costs attached to each. If you're living elsewhere during the build, proof of where you'll stay and how you'll cover those costs also comes into the assessment, particularly if you're still servicing a mortgage on the block being rebuilt.

How the Progressive Drawdown Works in Practice

The builder submits a claim after completing each stage, and the lender arranges a progress inspection to confirm the work matches the claim. Once verified, the funds go directly to the builder, not to you. The draw schedule typically includes five to six stages: base stage (slab or stumps), frame stage, lock-up (roof and windows), fixing stage (internal fit-out), and practical completion. Some lenders charge a progressive drawing fee for each inspection, usually between $300 and $500 per drawdown. You'll also pay interest on the amount drawn so far, which increases with each payment released.

In the Margaret River area, where builders are often juggling multiple projects between Cowaramup and Augusta, delays can push out the construction timeline. A wet winter can hold up earthworks, or a delayed timber delivery can stall framing. Each delay means you're carrying interest-only repayments for longer before the home is finished and you can move in or rent it out.

Interest Costs During Construction and After Completion

During the build, you pay interest only on the drawn-down amount. Once the home reaches practical completion and you've drawn the full loan, the loan converts to principal and interest repayments unless you've arranged to stay on interest-only for an agreed period. Construction loan interest rates are often slightly higher than standard variable rates, and lenders typically offer variable rates rather than fixed during the construction phase. After completion, you can usually switch to a fixed rate if that suits your situation.

Owner Builder Finance and Why It's Harder to Arrange

If you're planning to project manage the build yourself and pay sub-contractors directly, most mainstream lenders won't support the application. Owner builder finance carries higher risk because there's no registered builder holding insurance or guaranteeing the quality of the work. The few lenders who do offer owner builder loans require a higher deposit, charge a higher interest rate, and want detailed evidence of your building experience and trade qualifications. For most people in Margaret River looking to knock down and rebuild, working with a local registered builder simplifies the lending process and reduces the chance of cost blowouts or construction delays.

Timing and Where You'll Live During the Build

Most knockdown rebuild projects in the region take eight to twelve months from demolition to practical completion, depending on the size of the home and the builder's schedule. You'll need somewhere to live during that time. Some people move in with family, others rent locally, and a few park a caravan on a friend's block. Lenders want to know your accommodation plan because they're assessing whether you can service the construction loan and cover living costs simultaneously. If you're renting during the build and that rent is close to what your mortgage repayment will be once the home is finished, the lender will factor both into the serviceability calculation.

The demolition itself usually happens quickly, often within a week, but council approval and finalising the building contract can take months. Most lenders require you to commence building within a set period from the loan disclosure date, typically six to twelve months, so getting your timing right matters. If the build drags on or doesn't start on time, some lenders will reassess the loan or withdraw the approval.

What Happens If the Build Costs More Than Expected

A fixed price building contract protects you from most cost variations, but it won't cover changes you request once the build is underway. Upgrading benchtops, adding a deck, or moving a window all trigger variation costs that sit outside the contract. If those variations push your total project cost above the approved loan amount, you'll need to cover the shortfall from savings or request a loan top-up. Lenders are often reluctant to increase the loan mid-build unless the property's value has risen enough to support the additional borrowing.

Local Builders and How That Affects Lender Appetite

Lenders prefer builders with a track record and appropriate insurance. In Margaret River, most registered builders are well known to the local lender panels, which can smooth the approval process. A builder who has completed multiple projects in the region and holds valid contract works insurance is far easier to finance than a sole trader with no completed builds. If you're considering a builder from Perth or further afield, lenders will want more detail about their licensing, insurance, and previous work.

You'll want to talk through your specific situation before committing to a builder or signing anything. Call one of our team or book an appointment at a time that works for you.

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