How Construction Loan Structures Differ from Standard Home Loans
A construction loan releases funds in stages as your build progresses, rather than in a single lump sum at settlement. You only pay interest on the amount drawn down at each stage, which means your repayments start low and increase as more funds are released.
In Hawthorn, where many buyers are building on subdivided blocks or demolishing older homes to rebuild, this staged funding model becomes particularly relevant. Consider a scenario where someone is building a contemporary two-storey residence on a 400-square-metre block near Glenferrie Road. The land might settle for $1.2 million, with construction approved at $800,000. Instead of paying interest on $2 million from day one, interest accrues only as each progress payment is made to the builder.
The structure typically involves five or six progress payments tied to construction milestones: base stage, frame stage, lock-up, fixing, and completion. Each payment is released after a bank-appointed inspector confirms the corresponding stage has been reached. Between these inspections, your interest charges reflect only the funds already drawn, not the total approved amount.
This staged approach requires coordination between your builder's progress payment schedule and the lender's drawdown process. Most lenders charge a Progressive Drawing Fee, usually between $300 and $500 per inspection, to cover the cost of sending a qualified inspector to verify each stage. This fee structure applies whether you're building under a construction loan for a detached home or a substantial renovation.
The Construction to Permanent Loan Model
Most construction finance in Australia is structured as a construction to permanent loan, which converts automatically to a standard home loan once the build is complete. During construction, you make interest-only payments on the drawn amount. After practical completion, the loan converts to principal and interest repayments based on the full amount.
This conversion happens without requiring a new application or additional approval, provided the build stays within the approved budget and timeline. The construction loan interest rate during the build phase is often slightly higher than standard variable rates, reflecting the additional risk and administration involved in staged funding. Once the loan converts, the rate typically moves to the lender's standard variable or fixed rate, depending on what you've selected.
The advantage of this model is continuity. You don't need to refinance or reapply once construction finishes, which saves on application fees and valuation costs. The loan structure is agreed upfront, including what your repayment type and interest rate will be after conversion.
For buyers in Hawthorn working with architects on custom designs, the construction to permanent loan provides certainty about your long-term borrowing structure while maintaining flexibility during the build. You know what your repayments will look like once you move in, which helps with budgeting during a period where costs can be difficult to predict.
Fixed Price Building Contracts and Drawdown Timing
A fixed price building contract is generally a requirement for construction loan approval. This contract specifies the total build cost and ties payments to defined milestones, giving the lender confidence that funds will be released according to a predictable schedule.
Under a fixed price contract, the builder agrees to complete the work for a set amount, regardless of cost variations in materials or labour. The progress payment schedule is included in the contract, usually structured as a percentage of the total contract price at each stage. A common structure might allocate 10% at base, 15% at frame, 35% at lock-up, 25% at fixing, and 15% at completion.
The lender's drawdown process follows this schedule. Once the builder confirms a stage is complete, you notify the lender, who arranges an inspection. If the inspector confirms the stage has been reached, the corresponding funds are released to the builder. The time between requesting a drawdown and funds being released is typically three to five business days, assuming the inspection is satisfactory.
Timing becomes important if your builder needs payment by a certain date to order materials or pay sub-contractors. Coordinating the inspection and drawdown process with your builder's cash flow needs prevents delays. Some builders will absorb short delays, but others operate on tight margins and expect payment promptly once a stage is reached.
Cost Plus Contracts and Lender Appetite
A cost plus contract allows the builder to charge actual costs plus a margin, rather than working to a fixed total. This structure is more common in high-end custom builds or renovations where the scope is difficult to define precisely before work begins.
Most lenders will not approve construction finance against a cost plus contract. The lack of a defined total makes it difficult to assess loan serviceability and increases the risk that the project will exceed the approved budget. If you're building a custom home in Hawthorn with a builder who prefers a cost plus arrangement, you'll likely need to negotiate a fixed price contract or a capped cost plus contract to secure lending.
A capped cost plus contract sets a maximum price, with the builder charging actual costs plus margin up to that cap. This can provide some flexibility for design changes while giving the lender the certainty needed to approve funding. However, even capped contracts are less widely accepted than fixed price building contracts, and you may find your choice of lenders is more limited.
Owner builder finance operates under similar constraints. If you're acting as your own builder, you'll need to provide detailed costings and demonstrate relevant experience. Most lenders either decline owner builder applications or require a significantly larger deposit, often 30% or more, to offset the increased risk.
Land and Construction Packages vs Separate Purchases
A land and construction package involves buying land and contracting a builder at the same time, often through a developer or builder offering both components together. The lender assesses both the land value and the construction cost as a single transaction, releasing land funds at settlement and construction funds progressively.
This differs from purchasing land separately and then arranging construction later. If you buy land first, you'll need to settle that purchase with a standard home loan or land loan, then apply separately for construction finance once you have council approval and a signed building contract. The lender will assess your serviceability based on the combined debt from both the land loan and the proposed construction loan.
In Hawthorn, where suitable land is limited and often involves demolishing an existing dwelling, most buyers are working with separate land purchase and construction timelines rather than packaged deals. You might buy a property with an older home, live in it or lease it while securing council plans, then demolish and build. In this scenario, your initial loan covers the land purchase, and you apply for construction funding once your development application is approved and you have a registered builder under contract.
The refinancing option can work if your land has increased in value between purchase and construction approval. The equity gain may improve your borrowing capacity or reduce the deposit required for the construction component. Lenders will order a new valuation based on the land value with approval in place, which can be higher than the original purchase price if the area has appreciated or if the development approval adds value.
Interest Capitalisation During Construction
Some lenders allow interest charges to be capitalised during the construction phase, meaning the interest is added to the loan balance rather than paid monthly. This can reduce your cash outflow during the build, but it increases your total debt and means you're paying interest on interest once the loan converts.
Capitalisation can be useful if you're selling an existing property to fund the build and need to minimise cash outflow until that sale settles. It's less suitable if you're renting while building or if managing monthly expenses isn't an issue. The difference in total interest costs can be significant over the life of the loan, depending on how long construction takes and what interest rate applies.
Most construction loans in Hawthorn are structured with interest-only repayment options during the build, with monthly payments required as each drawdown occurs. You receive a revised repayment amount each time funds are released, reflecting the new drawn balance. Once the build reaches practical completion and the loan converts, you move to principal and interest repayments based on the full amount.
If you're planning a substantial renovation rather than a new build, the same structure applies. A house renovation loan works on the same progressive drawdown model, with funds released as work is completed. The main difference is that you're usually living elsewhere during the work, so you may be paying rent or a mortgage on another property at the same time as construction interest, which affects serviceability.
Council Approval and Loan Timing Requirements
Most construction loan approvals require you to commence building within a set period from the loan approval date, typically six to twelve months. If construction doesn't start within that window, the approval may lapse, requiring a new application and assessment.
This timing requirement means you need to have your council approval and building contract in place before applying, or at least be confident they'll be finalised within a few weeks of approval. In Hawthorn, where council plans can take several months to approve, it's common to wait until your development application is submitted and you have an indicative timeline from council before starting the loan application.
Once council approval is granted and you have a signed fixed price building contract with a registered builder, the lender will issue a formal approval and you can proceed to settlement if purchasing land, or to the first drawdown if you already own the site. The construction loan application process involves providing the building contract, council-approved plans, and a copy of the builder's insurance and registration.
Delays in obtaining council approval can affect your build timeline and, by extension, your loan approval. If you're refinancing an existing property to fund construction, the new loan approval may lapse if the build doesn't start on schedule. Keeping your broker informed about any delays allows them to request an extension or resubmit the application if needed, avoiding the need to restart the approval process from scratch.
Choosing Between Fixed and Variable Rates During Construction
During the construction phase, most lenders offer a variable construction loan interest rate. Once the loan converts to a standard home loan after completion, you can choose between fixed and variable rates, or a split structure.
Fixing your rate during construction is less common because the drawn balance changes every few weeks as progress payments are made. A variable rate during construction allows the interest calculation to adjust automatically as each drawdown occurs. After conversion, fixing provides certainty about your repayments, which can be useful if you've stretched your budget to complete the build.
A split rate structure, where part of the loan is fixed and part remains variable, can offer a middle path. You get some repayment certainty from the fixed portion while retaining the flexibility to make additional payments against the variable portion without incurring break costs. This approach is worth considering if you expect to receive funds from a property sale or other source within a few years of moving in.
Managing Variations and Budget Overruns
Even with a fixed price building contract, variations can occur if you request changes to the original plans or if unforeseen site conditions require additional work. Each variation needs to be documented in writing and approved by both you and the builder, with an agreed price.
If variations push the total cost above your approved loan amount, you'll need to fund the difference yourself or apply for a loan increase. A loan increase requires a new assessment of your serviceability and may require an updated valuation. If your income or circumstances have changed since the original approval, the lender may not approve the additional funds.
Budgeting a contingency of at least 10% of the construction cost helps manage variations without needing to increase your loan. If your build is approved at $800,000, having $80,000 in accessible savings or equity provides a buffer for changes or unexpected costs. This contingency can sit in an offset account linked to your construction loan, reducing interest charges while remaining available if needed.
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Frequently Asked Questions
How do construction loan repayments work during the build?
You make interest-only payments on the amount drawn down at each stage, not the full approved loan. As each progress payment is released to your builder, your monthly repayment increases to reflect the new drawn balance.
Do I need a fixed price building contract to get construction finance?
Yes, most lenders require a fixed price building contract with a registered builder before approving construction finance. Cost plus contracts are generally not accepted unless they include a firm price cap.
What happens to my construction loan after the build finishes?
The loan converts automatically to a standard home loan with principal and interest repayments. This happens at practical completion without needing a new application, provided the build stayed within the approved budget and timeline.
Can I capitalise interest during construction instead of making monthly payments?
Some lenders allow interest to be added to your loan balance rather than paid monthly during construction. This reduces cash outflow during the build but increases your total debt and means you pay interest on interest once the loan converts.
How long do I have to start building after construction loan approval?
Most lenders require you to commence building within six to twelve months of loan approval. If construction doesn't start within that window, the approval may lapse and you'll need to reapply.
