Securing a construction loan in Australia requires more than just a deposit and approved plans. You need to understand exactly how funds are released, when interest charges begin, and what your cash flow will look like at each stage. In 2026, with the average new home build cost reaching $473,000 according to the Australian Bureau of Statistics, and construction timelines stretching to 9.7 months on average for detached houses, the way you manage progress payments and interest during the build period can save or cost you thousands.
This guide breaks down the construction loan progress payment schedule, explains interest calculation during the build phase, and provides a clear build loan drawdown schedule example so you can plan ahead.
How Construction Loan Progress Payments Work
A construction loan differs fundamentally from a standard home loan. Instead of receiving the full loan amount at settlement, the lender releases funds in stages as your builder completes defined portions of work. This staged approach protects both you and the lender—the bank only funds work that has been completed, and you only pay interest on money that has actually been drawn down.
The construction loan progress payments explained simply: each time a construction milestone is reached, your builder issues an invoice. You approve it, the lender conducts a progress inspection, and then the next payment is released. This continues until the final handover.
In 2026, most Australian lenders follow a six-stage drawdown schedule, though some builders and custom projects may negotiate five or seven stages. The standard stages align with the HIA (Housing Industry Association) fixed-price building contract, which remains the most widely used contract in Australian residential construction.
The Standard Six-Stage Build Loan Drawdown Schedule
Understanding the build loan drawdown schedule is critical for managing your finances. Each stage represents a percentage of the total contract price, and the lender releases funds accordingly. Here is the typical breakdown used by major Australian lenders in 2026:
Stage 1: Deposit (5-10%) Paid upon signing the building contract. This covers the builder’s initial costs including permits, soil tests, and preliminary drawings. Many lenders will fund this stage provided you have already paid your own deposit to the builder.
Stage 2: Slab Down or Base Stage (15-20%) Released after the concrete slab is poured and cured, or for stumped foundations, once the base structure is complete. A progress inspection is mandatory before this payment.
Stage 3: Frame Stage (20-25%) Funds are released when the wall and roof frames are erected and approved. This is often the largest single payment because it covers substantial material and labour costs.
Stage 4: Lock-Up Stage (15-20%) The building is at lock-up when external walls, windows, and doors are installed, and the roof covering is complete. The structure is now weatherproof.
Stage 5: Fixing or Internal Linings Stage (15-20%) Released once internal linings, architraves, and cabinetry are installed. Plumbing and electrical rough-ins are also complete by this point.
Stage 6: Practical Completion (10-15%) The final payment covers finishing trades, painting, tiling, and final fixtures. The builder must rectify any defects before you sign off and the lender releases the remaining funds.
The exact percentages vary by builder contract and lender policy. Always confirm your specific drawdown schedule with your lender before signing, as some may require larger deposits or adjust stage percentages based on the build type.
Interest During the Construction Period: How It Is Calculated
One of the most misunderstood aspects of construction finance is interest during construction period. You do not pay interest on the full loan amount from day one. Instead, interest accrues only on the funds that have been drawn down to date. This is called progressive interest or interest on drawn amounts.
Here is how the calculation works in practice. Suppose you have an approved construction loan of $600,000 but have only drawn $90,000 at the slab stage. Your monthly interest charge is calculated on that $90,000, not the full $600,000. As each subsequent stage is drawn, the outstanding balance increases, and so does your interest payment.
For a build spanning 10 months in 2026, with an interest rate of 6.85% p.a. (a typical construction loan variable rate), the interest during construction is calculated daily and charged monthly. Most lenders will capitalise the interest—meaning it is added to your loan balance rather than requiring you to make cash payments during the build. This preserves your cash flow for rent or other living expenses while your new home is under construction.
However, capitalising interest increases your total loan balance. By the end of the build, you may owe several thousand dollars more than the original construction contract price. Understanding this cost upfront prevents surprises at handover.
Construction Loan Cost Example for an Australian Build
To make this concrete, here is a construction loan cost example Australia scenario based on realistic 2026 figures.
Assume you are building a four-bedroom home with a fixed-price contract of $450,000. You have a $150,000 deposit (including land equity), leaving a construction loan requirement of $300,000. The build is projected to take 10 months, and your lender offers a variable construction rate of 6.85% p.a. with interest capitalised monthly.
The drawdown schedule and cumulative interest might look like this:
- Month 1: Deposit stage – Draw $30,000. Interest on $30,000 for one month ≈ $171.
- Month 2: Slab stage – Draw $60,000. Cumulative drawn $90,000. Interest for month ≈ $514.
- Month 3: Frame stage – Draw $75,000. Cumulative drawn $165,000. Interest ≈ $942.
- Month 5: Lock-up stage – Draw $60,000. Cumulative drawn $225,000. Interest ≈ $1,284.
- Month 7: Fixing stage – Draw $45,000. Cumulative drawn $270,000. Interest ≈ $1,541.
- Month 9: Completion – Draw final $30,000. Cumulative drawn $300,000. Interest ≈ $1,713 in the final month.
Total capitalised interest over the 10-month build could reach approximately $9,500 to $10,500, depending on the exact timing of each drawdown. This means your loan balance at the end of construction would be around $310,000 rather than the $300,000 contract amount. Factoring this into your budget from the outset avoids cash flow strain when the loan converts to a standard principal-and-interest repayment structure.
Factors That Influence Your Drawdown Schedule and Interest Costs
Several variables affect both the timing of progress payments and the total interest you pay during construction. Being aware of these can help you negotiate better terms or plan more accurately.
Builder size and payment terms: Larger project builders often require a 10% deposit, while smaller custom builders might accept 5%. A higher upfront deposit means more interest accrues earlier. Construction timeline delays caused by weather, material shortages (still a factor in some regions in 2026), or council inspections can extend the build and increase total capitalised interest.
Lender inspection turnaround: Each progress payment requires a lender-appointed valuer or inspector to confirm the work is complete. Delays in booking these inspections—sometimes up to 10 business days in busy periods—can push back drawdowns and extend the interest accumulation period on the current balance.
Fixed-price vs cost-plus contracts: Fixed-price contracts give certainty on the drawdown amounts. Cost-plus contracts, where you pay the builder’s actual costs plus a margin, can result in uneven drawdowns and higher-than-expected interest if costs blow out. In 2026, with construction cost inflation moderating but still present, fixed-price contracts remain the safer option for most borrowers.
Managing Cash Flow During the Build Phase
While capitalised interest means you do not need to make monthly repayments during construction, you still need to manage other costs. Many borrowers face the double burden of paying rent or an existing mortgage while their new home is being built.
One strategy is to negotiate with your lender for an interest-only period during construction, where you pay the accrued interest each month rather than capitalising it. This keeps your loan balance at the contract amount and can save several thousand dollars over the life of the loan. However, it requires you to have sufficient cash flow to cover both the interest payments and your existing living costs.
Another approach is to use a redraw facility or offset account linked to the construction loan. If you park your savings in an offset account, you reduce the net balance on which interest is calculated, effectively lowering your interest cost without locking the funds away permanently.
What Happens When Construction Is Complete
Once the builder hands over the keys and the final progress payment is made, your construction loan typically converts to a standard home loan. At this point, you will begin making principal and interest repayments on the full drawn balance, including any capitalised interest.
This is also the moment to review your loan structure. The variable rate that applied during construction may not be the most competitive option for the long term. Many borrowers in 2026 are choosing to split their loan, fixing a portion to protect against rate rises while keeping a variable portion for flexibility and offset benefits.
It is also wise to conduct a final reconciliation of the drawdown schedule against the actual work completed. Ensure no payments were released for incomplete work and that all defects have been addressed before the builder receives the final payment. The lender’s final inspection report is a valuable document to keep for your records.
FAQ
How long does a typical construction loan drawdown schedule take in Australia? The standard six-stage drawdown schedule usually spans 8 to 12 months for a single-storey detached home in 2026. Multi-storey or custom builds can extend to 18 months or longer. Each stage typically takes 4 to 8 weeks, though weather delays and material availability can stretch individual stages by 2 to 3 weeks.
When do I start paying interest on my construction loan? Interest begins accruing from the date of the first progress payment drawdown, not from the loan approval or contract signing date. For example, if your loan settles and the deposit stage is drawn on 15 January 2026, interest on that amount starts from 15 January. The interest is calculated daily and charged monthly, with most lenders capitalising it until construction is complete.
Can I make extra repayments during the construction period to reduce interest? Yes, most construction loans allow extra repayments without penalty, even during the drawdown phase. If you have surplus cash, making a payment directly to the loan reduces the drawn balance and therefore the interest charged in subsequent months. In a $300,000 build with a 6.85% rate, paying an extra $10,000 at the frame stage could save approximately $570 in interest over the remaining 6 months of construction.
参考资料
- Australian Bureau of Statistics, Building Activity, Australia, December 2025 quarter, released February 2026.
- Housing Industry Association, HIA Fixed Price Building Contract, 2026 edition.
- Australian Securities and Investments Commission, Construction loans: Understanding progress payments, MoneySmart guidance updated March 2026.
- Reserve Bank of Australia, Statement on Monetary Policy, May 2026, for current lending rate environment.
- Master Builders Australia, National Construction Cost Trends Report, Q1 2026.