Construction Loans in Australia: Progress Payments and Drawdowns

Short answer

A construction loan usually releases money in stages as building work progresses. The builder issues an invoice for a completed stage, the borrower checks and authorises it, and the lender assesses the drawdown under its loan process.

Interest and repayments can begin after the first loan amount is drawn. The amount charged during construction may change as more money is released.

There is no single national progress-payment schedule or universal lender process. The building contract, state law, lender policy, valuation, inspections, borrower contribution and loan terms all matter.

Use the Mortgage Repayment Calculator for a completed-loan scenario. It does not model staged drawdowns and should not be used as a construction-loan quote.

How a staged construction loan differs from a standard purchase loan

For an established property purchase, most loan funds are normally advanced at settlement.

For a build, the approved facility may be larger than the amount currently drawn. Funds can be released as work reaches agreed stages and the builder's invoices become due.

That creates three separate figures:

Interest is generally linked to the amount actually drawn, subject to the loan contract. A borrower should not assume the full approved facility is accruing interest from day one, or that every lender uses the same timing and fee treatment.

A common progress-payment workflow

The NSW Planning Portal gives a practical state example:

1. The lender approves the loan and receives the construction documents.
2. The lender provides formal approval for construction to start.
3. The builder completes a stage and issues an invoice.
4. The borrower checks and authorises the invoice.
5. The invoice is sent to the lender.
6. The lender completes any required checks before releasing the progress payment.

The same NSW guidance lists site preparation, foundations, frame, lock-up, fit-out and practical completion as common build stages. Those labels do not create a national payment schedule. The contract may use different stages, values and evidence requirements.

Ask the lender and builder to put the process in writing before construction starts.

Worked example: why build-stage interest changes

Assume a construction facility with a 6.50% annual interest rate. At one point in the build, $240,000 has been drawn.

A simple monthly interest illustration is:

$240,000 x 6.50% / 12 = $1,300

Later, after more progress payments, the drawn balance reaches $450,000:

$450,000 x 6.50% / 12 = $2,437.50

The difference is $1,137.50 for that simplified month.

This is not a repayment quote. Lenders commonly calculate interest daily, drawdowns can happen partway through a month, fees may apply and the interest rate can change. Some construction loans use interest-only payments during part of the build, while others use a different arrangement.

ASIC Moneysmart notes that an interest-only structure may be useful for a construction loan, but it also warns that the principal does not reduce and repayments can rise when the interest-only period ends.

Questions to ask the lender before signing

Record the answers in writing:

1. When does interest start, and on which amount?
2. Are payments interest-only, principal-and-interest or another structure during construction?
3. How are daily interest and part-month drawdowns calculated?
4. Must the borrower contribution be used before lender funds?
5. Which invoices, certificates, inspections or valuations are needed at each stage?
6. How long does a drawdown request usually take?
7. Are there drawdown, valuation, inspection or progress-payment fees?
8. What happens if the builder invoice is higher than the scheduled drawdown?
9. When does the loan convert to its post-construction repayment structure?
10. What happens if the build is delayed beyond the loan's construction period?

The answers can change the cash buffer needed during the build.

Questions to check against the building contract

The loan approval and building contract need to work together.

Check:

• whether the contract stages match the lender's drawdown stages;
• who confirms that a stage is complete;
• what evidence supports a progress claim;
• whether variations change the next claim or require separate payment;
• which amounts are fixed and which are allowances;
• how delays affect rent, storage and temporary accommodation; and
• whether the final payment depends on handover, certificates or defect processes.

Read the Provisional Sums Guide for variable allowances and the Building and Pest Inspection Checklist for independent inspection scope. These pages provide general information and do not interpret a contract.

Keep three budgets, not one

A build can be easier to track when costs are separated into:

1. Land and purchase costs

Include duty, transfer fees, legal work and inspections. The Property Purchase Cost Calculator can provide an indicative starting point, but it does not estimate construction costs.

2. Building contract and variations

Track the base contract, prime cost items, provisional sums, approved variations and payments already made.

3. Holding and timing costs

Track construction-loan interest, rent or temporary accommodation, storage, insurance, rates, utilities, valuation fees and a delay allowance.

Combining these into one headline number can hide which costs are fixed, which depend on time and which remain uncertain.

Common mistakes

• Treating the approved loan amount as if it has all been drawn.
• Assuming every lender charges only interest during construction.
• Using the completed-loan repayment as the build-stage payment.
• Authorising an invoice without checking the stated stage and contract process.
• Assuming the lender inspection replaces an independent quality inspection.
• Forgetting rent and temporary accommodation during a delay.
• Spending the contingency on upgrades before site and allowance risks are known.
• Assuming a loan approval means every variation will be funded.

State and lender rules vary

Domestic building contracts and progress-payment rules are state and territory based. The NSW Planning Portal source used here is an example of one jurisdiction's process, not a statement of the law for every Australian build.

Lenders can also use different drawdown documents, valuation processes, contribution ordering, construction time limits and post-build repayment rules.

Obtain the proposed loan contract, building contract and payment schedule before relying on an estimate. Consider legal advice on the building contract and licensed credit assistance where needed.

Sources

• NSW Planning Portal: Build phase guidance, including progress payments, mortgage payments, drawdown invoices and common build stages, checked 4 August 2026.
• NSW Planning Portal: Building your project home, including the project-home payment and repayment notes, checked 4 August 2026.
• ASIC Moneysmart: Interest-only home loans, updated 29 July 2026 and checked 4 August 2026.
• ASIC Moneysmart: Choosing a home loan, updated 29 July 2026 and checked 4 August 2026.

General information disclaimer

This guide provides general information and simplified indicative calculations only. It is not financial advice, credit advice, legal advice, a lender quote, a loan offer, an approval or an interpretation of a building contract. Loan, drawdown, inspection, payment and construction rules vary. Check the proposed contracts with the lender, builder and appropriately licensed professionals.

Last updated: 4 August 2026.