Construction Loans: How Progress Payments, Valuations and Builds Work
A construction loan is not a regular home loan with a different name. The money is released in stages as your home is built, the lender is involved at every stage, and the approval rests on documents — a building contract, plans and approvals — that do not exist for an established home purchase. Understanding the mechanics before you sign a building contract will save you delays, disputes and cash flow surprises during the build.
How a construction loan differs from a standard home loan
With a standard loan, the lender advances the full amount at settlement. With a construction loan, the lender approves a total facility upfront but drip-feeds it to your builder in progress payments as each construction stage is completed. You are charged interest only on the amount drawn so far, not the whole facility, and the lender values the project as if complete — the on-completion value — before approving anything.
The application needs more than payslips and statements: expect to provide a signed fixed-price building contract, council-approved plans and specifications, builders insurance details, and evidence of your deposit and any land equity. If you have not bought the land yet, land and construction are often financed together, with the land settled first and the build drawn down afterwards.
Progress payments: how the money flows
Building contracts in Australia typically break the build into five or six stages, each with a percentage of the contract price attached. A common pattern:
- Deposit — paid to the builder to start (contract deposits are capped by state law)
- Slab or base — site prepared and slab poured
- Frame — frame up and approved
- Lock-up — external walls, roof, windows and doors complete
- Fixing or fit-out — internal fittings, plumbing and electrical roughed in and fixed
- Completion — final payment on practical completion
At each stage, the builder invoices, you approve the claim, and the lender pays the builder directly — usually after an inspection or valuation confirms the stage is genuinely complete. Two practical rules protect you here. First, never sign a stage claim for work that is not actually done; the progress payment system is your leverage for quality and timing. Second, your own contribution is generally used before the lender's money, so budget your cash flow for the front end of the build.
Why lenders want a fixed-price contract
Lenders strongly prefer — and many require — a fixed-price building contract from a licensed, insured builder, because it caps the project cost and makes the on-completion valuation meaningful. Cost-plus contracts, where you pay the builder's costs plus a margin, leave the final price open-ended and are unacceptable to most lenders.
Fixed price does not mean nothing can change. Watch for provisional sums and prime cost items (allowances for things like site works or fittings that are estimates, not quotes), variations you request during the build, and site-condition clauses covering things like rock or unstable soil. Every variation increases the contract price, and here is the trap: the lender approved a facility based on the original contract, so significant variations either come from your own pocket or require a formal loan increase — which means a re-assessment. Keep a contingency buffer of your own money outside the loan, and get any large variation priced and approved before the work happens.
A 15-minute chat is usually enough to map your options — free, no obligation.
Valuations: the number that shapes everything
The lender's valuer assesses the on-completion value from your contract, plans and comparable sales — before a slab is poured. If that valuation comes in below your land-plus-build cost, your loan shrinks and you must cover the gap, so it pays to keep your build specification realistic for the area. During the build, the lender re-inspects at each progress stage before releasing funds; a final inspection at completion confirms the home matches the plans before the last payment. These inspections can add a few days at each stage — build that into your expectations with the builder so nobody blames you for payment delays.
Interest-only during the build
Construction loans are typically interest-only during the build, converting to principal-and-interest once the final payment is made. Because you are only charged interest on what has been drawn, repayments start small and step up as each stage draws down. Remember the other side of that arrangement: if you are paying rent while you build, you carry rent plus a growing interest bill until handover, and builds run long more often than they run short. Stress-test your budget for a build that takes months longer than the contract says, and model the full post-construction repayment with our [repayment calculator](/calculators/repayment) before you commit.
Owner-builders: why it is genuinely hard to finance
Building without a licensed builder — as an owner-builder — is the hardest construction scenario to finance. Most lenders decline owner-builder applications outright; the few that accept them typically cap the LVR well below standard construction lending, want detailed costings and evidence of your capability, and scrutinise the project heavily. From the lender's side the logic is simple: no fixed-price contract, no builders warranty insurance in the usual form, and a high rate of cost blowouts and unfinished projects. If you are set on owner-building, expect to need substantially more of your own equity, and get finance advice before you get the owner-builder permit — not after.
Getting approved: what strengthens a construction application
The fundamentals are the same as any [home loan](/loans/home-loans) — clean credit, stable income, sensible debts — plus construction-specific strengths: a reputable licensed builder, a genuinely fixed-price contract with minimal provisional sums, council-approved plans, and a cash buffer beyond your deposit. [Pre-approval](/articles/home-loans/how-pre-approval-works) before you sign a building contract is even more valuable than usual, because it stops you committing to a build the valuation will not support. See our [construction loans page](/loans/construction-loans) for how we structure these.
Talk it through with a broker
Construction lending varies more between lenders than almost any other loan type — progress payment handling, valuation practices and owner-builder appetite all differ. If you are planning a build, [get in touch](/contact) before you sign the building contract and we will line the finance up around it.
Frequently asked questions
How do progress payments work on a construction loan?
Your building contract splits the build into stages — typically slab, frame, lock-up, fixing and completion — each with a percentage of the contract price. As the builder completes each stage, they invoice, you approve the claim, and the lender pays the builder directly, usually after an inspection confirms the stage is done. You pay interest only on what has been drawn so far.
Do I need a fixed-price building contract to get a construction loan?
Most lenders require one from a licensed, insured builder, because it caps the cost and supports the on-completion valuation. Cost-plus contracts are unacceptable to most lenders. Even in a fixed-price contract, watch provisional sums, prime cost items and variations — cost increases beyond the approved facility come from your pocket or need a formal loan increase.
What happens if the valuation comes in lower than my build cost?
The lender lends against the on-completion valuation, so if it comes in below your land-plus-construction cost, your maximum loan shrinks and you must fund the shortfall yourself. Over-capitalised builds — specifications too expensive for the suburb — are the usual cause. Keep the build realistic for the area and get finance approved before signing the building contract.
Are construction loan repayments interest-only?
Usually, yes — during the build you pay interest only on the drawn balance, so repayments start small and rise with each progress payment. The loan typically converts to principal-and-interest after the final payment at completion. Budget for carrying rent plus the growing interest bill if you are renting during the build, and for the build running longer than planned.
Can I get a construction loan as an owner-builder?
It is possible but genuinely difficult. Most lenders decline owner-builder applications, and those that accept them cap the LVR well below standard construction lending, require detailed costings and evidence of capability, and apply heavy scrutiny. Expect to contribute substantially more equity, and get finance advice before committing to the owner-builder route.
Can I include the land purchase in my construction loan?
Yes — land and construction are commonly financed together. The land component settles first like a normal purchase, then the construction facility draws down in stages as the build progresses. If you buy land well before building, be aware some lenders want construction to start within a set period, and vacant land alone is assessed more conservatively.