Construction Loans in Australia — How They Work

Building a home is a fundamentally different financing proposition to buying an established property. A construction loan is structured to match the way building works — releasing funds in stages as construction progresses, rather than as a lump sum at settlement.

Progressive Drawdown — How the Funds Are Released

A construction loan is drawn down in progress payments (also called progress claims) tied to construction milestones. The standard stages for a house-and-land build are:

1. Base/Slab: Foundation is complete. Typically 10–15% of the build cost.
2. Frame: Structural frame is erected. Typically 15–25%.
3. Lock-up: Roof is on, external walls and windows are in. Typically 20–25%.
4. Fit-out/Fixing: Internal fitout — plumbing, electrical, cabinetry. Typically 15–20%.
5. Practical completion: Build is finished and ready for occupation. Final balance paid, typically 10%.

Your lender inspects the property (or reviews builder invoices) before releasing each progress payment directly to the builder. You never handle the construction funds — they go from lender to builder.

Interest-Only During Construction

During the construction phase, you only pay interest on the amount drawn down, not the full approved loan amount. As more progress payments are made, your interest-only repayment amount grows with each draw. Once construction is complete, the loan typically converts to a standard principal-and-interest (P&I) loan on the full amount.

This is one of the cash flow advantages of construction loans: if you are paying rent while building, your interest-only payments are lower in the early stages when minimal funds have been drawn.

Fixed Price Contract Requirement

Virtually all lenders require a signed, fixed price building contract from a registered builder before approving a construction loan. The fixed price contract tells the lender exactly what the total build cost will be, so they can assess whether the funds are sufficient to complete the property. Contracts with provisional sums (unspecified amounts for items like landscaping or appliances) are acceptable in limited amounts, but a cost-plus or time-and-materials contract will be declined by most lenders.

Owner-Builder Difficulties

Obtaining a construction loan as an owner-builder (where you are both the client and the licensed builder) is significantly harder:

• Most lenders cap LVR at 60–70% for owner-builder construction loans
• Many mainstream banks do not offer owner-builder construction finance at all
• You typically need an owner-builder licence for the state you are building in, and some states require at least 5 years of relevant trade experience
• Without a registered builder on contract, the lender has far less certainty about the build completing on time and within budget

Timeframe Risks

Most construction loan approvals are valid for 12 months from approval (some allow 24 months). If your build extends beyond this — due to council delays, builder insolvency, weather, or supply chain issues — you may need to re-apply and re-qualify, potentially at different rates. Build delays are extremely common, so factor a contingency timeline into your planning.

Choosing a Builder

Your builder choice has direct implications for your loan. Before signing a building contract:

• Verify the builder holds a valid licence in your state (check the state building authority website)
• Confirm they carry Domestic Building Insurance (required by law in most states for contracts over $16,000)
• Check for any disciplinary history with the building authority
• Get references from recent clients whose builds are complete
• Ensure the contract includes a clear progress payment schedule that matches the lender's drawdown stages

Council Approval and Construction Certificates

Before a lender will release construction funds, you typically need Development Approval (DA) from your local council and a Construction Certificate (CC) or Complying Development Certificate (CDC) authorising the build. The approval process is the borrower's responsibility and can take 6–16 weeks depending on the council and project complexity. Start the approval process before approaching a lender for pre-approval.

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