Understanding the Basics of Knockdown Rebuild Finance

A knockdown rebuild gives you a new home on land you already own or have purchased with an existing dwelling.

For many families in Hampton East, this approach makes sense when the location suits but the house no longer does. The suburb's tree-lined streets and proximity to schools like Hampton East Primary and Hampton Park Secondary College make it worth staying, even when the home itself is outdated or poorly configured. Finance for this type of project differs from a standard home loan because funds release progressively as the build advances, not as a single lump sum at settlement.

How Construction Finance Differs From a Standard Home Loan

Construction finance releases in stages tied to building milestones rather than all at once. You only pay interest on what's been drawn down, not the full loan amount, until the build completes. Once construction finishes and you receive a Certificate of Occupancy, the loan converts to a standard principal and interest home loan.

The structure works around a progress payment schedule agreed with your registered builder. Typically, this includes payments at stages like slab down, frame up, lock-up, fixing stage, and practical completion. Each payment requires a progress inspection by the lender or an independent valuer before funds release. The exact number of stages varies depending on your lender and builder, but five to six drawdowns is common for a knockdown rebuild in Hampton East.

Deposit Requirements and Borrowing Capacity

Most lenders require a 20% deposit for a knockdown rebuild, calculated against the combined land value and total construction cost. If you already own the land, the equity in that property can contribute toward your deposit, though lenders will usually revalue the site before approving the loan.

Consider a family who owns a dated 1960s brick home in Hampton East valued at $1.1 million. They want to knock it down and build a double-storey custom home for $850,000. The combined project value is $1.95 million. With 20% equity already in the land, they have sufficient deposit without needing additional cash savings. The lender assesses their borrowing capacity based on the new loan amount of approximately $1.65 million, taking into account their income and existing commitments. During construction, they pay interest only on funds drawn down. Once the build finishes, the loan converts and repayments adjust to cover principal and interest on the full amount.

Fixed Price Building Contracts and Cost Plus Arrangements

A fixed price building contract sets a total construction cost upfront, with variations only for changes you request or unforeseen site conditions. This contract type suits most knockdown rebuilds because it gives certainty around the loan amount you need and limits exposure to cost overruns. Lenders prefer fixed price contracts because the risk profile is clearer.

A cost plus contract charges the actual cost of materials and labour plus a builder's margin. While this approach can suit custom or high-end projects, fewer lenders accept it for construction finance. If your builder proposes a cost plus arrangement, expect a smaller pool of lenders and potentially higher scrutiny during the construction loan application process.

Council Approval and Building Permits

You'll need a development application approved by the local council before a lender will consider your loan. For Hampton East, this goes through Bayside City Council. The approval process can take several months, particularly if your design includes variations to standard planning overlays or if neighbours lodge objections.

Lenders will also want to see your building permit issued before final loan approval. Some will provide conditional approval earlier in the process, but funds won't release until all permits are in place and the building contract is signed. Plan for a timeline of at least three to four months from initial loan application to first drawdown, assuming your council approval is already secured.

What Happens to Your Existing Mortgage During the Build

If you still have a mortgage on the property you're knocking down, that loan needs to be refinanced or rolled into the construction finance package. Most lenders will allow you to consolidate the existing debt with the new construction loan, provided your borrowing capacity supports the combined amount.

You'll also need somewhere to live during the build, which typically takes nine to twelve months for a knockdown rebuild. Some families move in with relatives, while others rent nearby to stay in the school catchment. The cost of temporary accommodation should factor into your budget, as it runs alongside your construction loan repayments.

Progressive Drawing Fees and Interest Charges

Lenders charge a progressive drawing fee each time funds release during construction. This fee typically ranges from $300 to $500 per drawdown and covers the cost of inspections and administration. With five or six drawdowns, these fees add up to $2,000 to $3,000 across the build.

Interest charges start from the first drawdown and increase as more funds release. During construction, most borrowers choose interest-only repayment options to manage cash flow, particularly if they're also paying rent elsewhere. At current variable rates, the interest component will be noticeably lower in the early months when only the first or second drawdown has occurred, compared to the later stages when most of the loan amount is drawn.

Choosing a Registered Builder and Managing Progress Payments

Your builder must be registered and hold appropriate insurance, including Home Warranty Insurance, for a lender to approve construction finance. Lenders will verify registration details and request a copy of the building contract before proceeding.

The progress payment schedule in your building contract should align with the lender's drawdown stages. Misalignment can cause delays, particularly if your builder expects payment before the lender is ready to release funds. Involving your mortgage broker in Hampton East early helps coordinate these timelines so the builder and lender are working to the same schedule.

When the Build Finishes

Once construction is complete and you have a Certificate of Occupancy, the lender conducts a final valuation to confirm the property value matches or exceeds the amount lent. The loan then converts from construction to a standard home loan, and repayments switch from interest-only to principal and interest unless you've arranged otherwise.

The final valuation is particularly relevant if you've built in a rising market. In Hampton East, where demand for quality new homes remains consistent due to the suburb's amenity and school access, a well-designed knockdown rebuild often values above the combined land and construction cost. This can provide immediate equity and may open up options to access funds for landscaping or other finishing touches.

If you're considering a knockdown rebuild in Hampton East and want to understand how construction finance applies to your situation, call one of our team or book an appointment at a time that works for you.

Frequently Asked Questions