Construction Loans in Australia: How They Work and What to Expect

Building a home from the ground up is one of the most exciting, and financially complex, property decisions you can make. A construction loan works differently from a standard purchase loan, and understanding the mechanics before you sign a building contract can save you significant stress and money.

What Is a Construction Loan?

A construction loan is a home loan specifically designed for building a new property. Unlike a standard home loan where the full amount is drawn at settlement, a construction loan releases funds in progressive drawdowns that align with the stages of the build.

This staged drawdown structure means you only pay interest on the funds you have actually drawn, not the full loan amount. During construction, your repayments are typically interest-only on the drawn balance.

How Construction Loan Drawdowns Work

Most building contracts in Australia follow a standard progress payment schedule based on construction stages. There are typically five to six drawdowns:

Deposit or slab: the initial payment on signing the building contract, covering site preparation and the concrete slab. This is usually around 10 to 15 per cent of the contract price.

Frame: when the frame of the structure is complete. Approximately 20 per cent.

Lock-up: when the home is weatherproof with external walls, roof, windows and doors. Approximately 20 per cent.

Fit-out or fixing: internal fit-out including plumbing, electrical, cabinetry and plastering. Approximately 20 per cent.

Practical completion: handover of the completed home. The final payment, often 25 to 30 per cent.

Your lender releases each drawdown after you request it and they confirm the relevant stage has been reached, often by arranging an inspection.

Interest During Construction

During the construction period, your interest is calculated only on the money that has been drawn. If you have a $500,000 construction loan and have only drawn $150,000 for the first two stages, you pay interest on $150,000, not $500,000.

This is one of the main advantages of a construction loan over, say, using a personal loan or redraw to fund a build. Your interest cost builds gradually as the project progresses.

Once construction is complete and the full amount is drawn, the loan typically converts to a standard variable principal and interest home loan.

Land Plus Construction

Most buyers who build need both a land loan and a construction loan. In many cases these are combined into a single facility.

If you buy the land first, you will draw the land amount at settlement and begin paying interest on that portion. The construction component is then drawn in stages when building begins.

Some lenders have different LVR requirements for land loans versus construction loans. Vacant land is typically assessed more conservatively because it generates no rental income and its value is more variable than an improved property.

What Lenders Assess for a Construction Loan

The assessment process for a construction loan is more detailed than for a standard purchase because the lender is securing a property that does not yet fully exist.

Lenders will require a fixed-price building contract from a licensed builder. Variable-price or cost-plus contracts are not acceptable to most standard lenders because the final cost is uncertain.

They will assess the land value and the as-if-complete valuation of the finished property. The as-if-complete valuation is a professional estimate of what the property will be worth once built. The lender's LVR calculation is based on this valuation.

Builder approval. Many lenders maintain a list of approved builders or require that the builder meet certain criteria, including being appropriately licensed and insured. Owner-builders are treated very differently and face significantly more restrictive lending conditions.

Fixed-Price Contracts Are Essential

Most lenders will not approve a construction loan without a signed, fixed-price building contract. This protects both you and the lender from cost overruns that could leave the loan undersecured.

If your builder is requesting a variable-price or cost-plus arrangement, be aware that this creates financing complications. Discuss it with your broker or lender before proceeding.

Cost Overruns: Planning for the Unexpected

Even with a fixed-price contract, variations requested by the owner during construction, site conditions that differ from what was anticipated, or delays that extend the build timeline can create additional costs.

It is prudent to hold a contingency buffer of five to ten per cent of the construction contract value. Make sure this buffer is factored into your overall budget and borrowing plan.

Timeline: How Long Does a Construction Loan Last?

Standard construction periods covered by construction loans are typically six to 18 months. Lenders usually set a maximum construction period and expect drawdowns to be completed within that window.

If the build runs significantly over time due to builder delays, material shortages or other factors, you may need to negotiate a loan extension with your lender.

Construction Loans for Knockdown-Rebuild Projects

If you already own a property, demolishing the existing dwelling and building new is another scenario that uses a construction loan. The land is typically already serving as security, and the construction loan component is drawn against the agreed build cost.

Use the Borrowing Capacity calculator at HomeLoanTools.com.au to understand the total amount you could borrow for land plus construction, and the Loan Repayment calculator to estimate what your repayments will look like both during and after the build.