Construction finance in Australia is lending released to a builder in stages rather than paid in full at once: the borrower pays interest only on the funds drawn so far while the home is built, then the facility converts to a normal principal and interest home loan on completion.
This guide explains how progressive drawdowns work, what lenders require before releasing each payment, where the real costs and risks sit and what to prepare before applying, from the perspective of a broker structuring a build for a client.
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What a construction loan is
A construction loan funds a new build or major renovation against the security of the finished property. Instead of one payout, the lender advances money at agreed milestones after each stage passes a valuation inspection. During construction the borrower’s repayments cover interest on drawn funds only, which keeps cash flow manageable while rent or another mortgage may still be running elsewhere. On completion the balance converts into an ordinary home loan with standard repayments.
How progressive drawdowns work
Funds are released against the stages set out in the signed building contract, typically following the HIA or MBA standard schedule rather than any single national formula. A common five-stage pattern runs slab, frame, lockup, fit-out and completion. Before paying each stage, the lender arranges a progress inspection to confirm the work matches the claim, protecting both parties from paying ahead of actual progress.
How construction loans differ from regular home loans
A standard home loan hands over the full amount at settlement, and repayment of principal begins immediately. A construction facility releases staged amounts, charges interest only on what has been drawn, and only moves to full principal and interest repayments once the build completes. The trade-off is heavier paperwork up front: council-approved plans, permits, a fixed-price building contract with a licensed builder and the builder’s insurance all form part of the file.
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Costs and risks worth pricing honestly
The rate story is often overstated: construction pricing is not always higher than an equivalent completed-dwelling variable loan, because interest is charged only on drawn funds during the build. The genuine extra costs usually sit in per-stage inspection fees, valuation updates and administrative charges, so compare those line items between lenders rather than headline rates alone.
The bigger financial exposure is overrun risk. Delays, material price movements and variations consume contingency budgets, and a slowdown in the Housing Market can leave the end value short of expectations, pushing the final loan-to-value ratio higher than planned. Set a contingency allowance before applying, agree variation procedures in writing with the builder, and keep the lender informed early when timelines slip rather than at the moment funds run dry.
Named lender examples
Policies below are indicative examples that change frequently, so confirm current settings directly with each lender before recommending anything.
NAB requires a fixed-price contract with a documented progressive payment schedule and specified insurances, including builder’s risk and home warranty cover, with interest charged on drawn amounts only during the build. Westpac releases funds across five standard stages and commonly expects a 20% deposit; borrowing above 80% LVR generally triggers mortgage insurance, which protects the lender rather than the borrower. Online lender loans.com.au runs a detailed application process with valuation inspections and stage-based disbursements, moving from interest-only to principal and interest on completion.
Preparing an application
- Council-approved plans, building permits and professional drawings.
- A fixed-price building contract with a licensed, insured builder.
- Proof of land purchase or existing title.
- The builder’s contract schedule of stages, matching the lender’s drawdown format.
- Standard serviceability evidence plus a realistic contingency figure.
Securing pre-approval before contracts are signed gives the client a working budget envelope and signals to builders that the finance is genuine, but check its expiry window against the expected build start, because construction pre-approvals usually run for a fixed period.
If you are structuring a build this month, start by collecting the builder’s draft stage schedule alongside the contract, match it against two or three lenders’ drawdown formats and inspection fee schedules, then present the client with the total cost of the structure including every per-stage charge rather than the headline rate alone. That comparison is where a construction deal is actually won or lost.
