Construction Loans —
What you need to know

How a construction loan is different from a standard home loan

A standard home loan funds a finished property in one settlement: the lender pays the seller, you take the keys, and repayments start. A construction loan is built for a property that does not yet exist. Instead of a single advance, the lender disburses funds in progress payments tied to the building schedule, and you only pay interest on the portion of the loan that has actually been drawn down.

Lenders treat construction lending as a slightly different risk because the security (your future home) is not finished. They want comfort that the build will be completed on time, on budget, and to a standard that supports the valuation they have relied on. That is why the paperwork, contracts and inspection process tend to be more involved than a regular purchase.

How progress payments work

Most lenders release funds across five standard stages. The exact names vary, but the typical structure for a fixed-price residential build looks like this:

• Deposit / slab — usually around 5 to 20 per cent, paid when the slab is poured
• Frame — when the timber or steel frame is up
• Lock-up / enclosed — external walls, roof, windows and doors complete
• Fixing — internal cabinetry, doors, skirting and fittings installed
• Practical completion — final stage, paid when the build is signed off and ready to occupy

Before each payment, the lender (or its valuer) typically inspects the work to confirm the stage has been completed. The builder issues an invoice, you sign an authority to pay, and the lender pays the builder directly. You only pay interest on the drawn balance, which means your repayments grow gradually as the home is built rather than starting at the full loan amount on day one.

Fixed-price vs cost-plus contracts

The type of building contract you sign has a big impact on the loan. Most lenders strongly prefer a fixed-price contract with a licensed registered builder, where the total cost is agreed up front and the builder absorbs cost overruns within the scope. Fixed-price contracts give the lender certainty that the funds requested will actually complete the home, which is why they are the default for owner-occupier construction loans.

Cost-plus contracts, where the owner pays the actual cost of materials and labour plus a builder margin, are harder to finance. The final cost is unknown at the start, so the lender cannot be confident the loan will cover completion. A smaller pool of lenders will consider cost-plus, often only for experienced builders or owner-builders with substantial equity, and usually with stricter conditions, lower loan-to-value ratios and ongoing cost reviews.

Owner-builder loans (where you act as your own builder) are a separate, narrower category again. Many lenders will not lend on owner-builder projects at all, and those that do typically cap the loan-to-value ratio well below standard construction lending.

Valuations and inspections

The lender orders two valuations during the process. The first is the "as if complete" valuation, done before the loan is approved. The valuer reviews the building plans, the fixed-price contract, and the land value, then estimates what the property will be worth once the build is finished. The loan amount is calculated against this future value.

From there, the lender values the property at each progress payment to confirm the work matches the schedule. If a stage is incomplete, has defects, or differs materially from the plans, the lender can withhold the next payment until issues are resolved. This protects both the lender and you, but it can occasionally cause friction if a builder is invoicing ahead of the work actually on the ground.

Interest-only during construction

Almost all construction loans are interest-only during the build period, which is typically capped at 12 to 18 months. This keeps repayments manageable while you are likely paying rent (or living elsewhere) and waiting for the home to be ready.

Once the build is complete and the final progress payment is made, the loan converts to a regular principal-and-interest home loan, often on whatever variable or fixed rate you have chosen. Some borrowers refinance at this point to access a sharper rate or a different feature set, although exit costs and re-valuation should be considered first.

What lenders typically want from you

Construction loan applications carry a few extra documents on top of a standard home loan submission. Depending on your circumstances, expect a lender to ask for:

• A signed fixed-price building contract with a licensed registered builder
• Council-approved plans and specifications
• A schedule of progress payments matching the contract
• Builder's insurance and home indemnity / home warranty cover (requirements differ by state)
• Quotes for any work outside the main contract (landscaping, driveways, pools)
• Evidence of your cash contribution and savings, plus the usual income, expense and identification documents

The Australian Securities and Investments Commission's MoneySmart site has a useful general primer on home loan structures, and the Australian Prudential Regulation Authority publishes the lending standards banks operate under.

Common pitfalls to plan for

A few issues come up often enough to be worth flagging up front:

• Variations — changes you request mid-build add cost and may not be funded by the original loan. Plan for a contingency buffer (often 5 to 10 per cent of the build cost)
• Delays — weather, trades, or supply issues can push the build past the lender's interest-only period. Talk to your broker early if you can see a deadline slipping
• Rate changes — the rate you are approved on may change between approval and the first drawdown, particularly in a moving market
• Final inspection issues — practical completion sometimes uncovers defects that hold up the final payment and the move-in date

None of this is a reason to avoid construction lending — thousands of Australians build successfully each year — but going in with realistic expectations makes the process much smoother. Whether a construction loan is the right structure depends on your circumstances, the contract you are signing, and the lender's appetite at the time. This article is general information only; we recommend speaking to a qualified mortgage broker and your accountant or solicitor before committing.

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