Construction home loans in Australia

A construction loan is not a regular mortgage with a hi-vis vest on. The lender is funding a building that does not exist yet, on land that may still look like a sandpit. Money goes out in stages. Interest follows the money. At the end, if all goes well, the facility converts to a standard principal-and-interest loan and you own a house that smelled of plaster last week.

This guide covers land-and-build versus knock-down-rebuild, progressive draws, how interest works during the build, the valuation cycle, and why cost overruns are a credit problem rather than a lifestyle surprise.

Two common shapes

House-and-land: you buy the lot (sometimes with a small separate land loan) and take a construction facility for the build contract. Knock-down-rebuild: you already own the land, demolish, and construct. Owner-builder pathways exist but many lenders will not touch them, or will demand more deposit and more paperwork. If you are not a licensed builder, assume owner-builder finance is a specialist product.

Fixed-price building contracts are the document lenders want. Cost-plus contracts shift risk to you and make credit teams nervous. Variations are where fixed-price contracts stop being fixed.

Progressive draws

Typical stages: deposit to the builder, base, frame, lock-up, fixing, completion. Names vary by state and builder. Before each draw, a valuer or inspector confirms the work exists. The lender then pays the builder — not you — up to the approved amount for that stage.

If the builder asks you to 'just pay this variation privately', you are changing the LVR and possibly the contract the lender approved. Tell the lender. Silent variations are how construction loans go off the rails.

Interest during construction

Interest is generally charged on drawn funds. At the start, after a land settlement and a builder's deposit, the drawn balance might be a fraction of the end loan. The monthly interest can look strangely small. Households then take on more car or card debt because the construction loan 'isn't costing much yet'. By lock-up, the interest looks like a mortgage. Budget for the end state, not the second month.

Some construction products are interest-only during the build, then switch to principal-and-interest. Know the switch date. Know whether the rate during construction is the same as the end rate.

Serviceability has to carry rent plus interest

Unless you are living in a tent on site (please do not), you will pay somewhere else to sleep. Lenders know this. Borrowing power for construction often includes an allowance for concurrent housing costs. That is why a household that could buy an existing unit cannot always fund a new house on the urban fringe.

First home buyers using grants or the 5 per cent deposit scheme need to check whether new builds and house-and-land packages are eligible, and whether the guarantee covers the construction phase. Rules are product-specific.

LVR on dirt and on a dream

Valuers assess land now and the completed 'as-if' value. Lenders cap LVR on vacant land more tightly than on completed houses. LMI can apply. If build costs inflate mid-project, the completed value may not rise in lockstep. The gap is yours to fund.

Hold a contingency — 5 to 10 per cent of the build price is a common kitchen-table rule — outside the loan if you can. A contingency that exists only as 'we'll redraw' is not a contingency; it is optimism.

Completion and conversion

At practical completion the lender wants occupancy, insurance, and a final inspection. The construction facility converts. If you planned to fix a rate at the end, lock that plan in writing; construction-period rates can be variable only.

Defects and builder insolvency are legal and insurance issues (domestic building insurance in many states) as much as credit issues. They still blow up the loan if the house is unfinished and the facility has expired.

Questions to ask

• Are progress inspections required at every stage, and who pays the valuer?
• Interest-only during build, and the conversion rate afterwards?
• How are variations approved?
• What happens if the builder goes into administration?
• Can I occupy before the final draw?

Construction is where Australian home lending is most operational. Compare the facility with the same seriousness as a completed-home loan, then add a hard hat. For the comparison method, see how to compare home loans.

Display-home contracts and upgrades

The $4,800 tapware upgrade is how a fixed-price contract becomes a moving LVR. Lenders approve a build cost. Upgrades you fund from savings are fine if you still have a contingency. Upgrades you expect the loan to swallow need a variation approved before the tapware is ordered. Builders are not credit assessors. They will happily write the variation.

Weather, slabs and sunset clauses

Rain in Brisbane can move a slab by weeks. Your construction facility has an expiry. Your land loan may have interest-only limits. Ask what happens if practical completion misses the facility end date. Extensions exist; they are not automatic. House-and-land sunset clauses on the land contract are a separate legal clock. Conveyancers earn their money here.

Owner-occupier grants during a build

First home grants and duty concessions on new homes often want occupancy within a period after completion, not after you signed the land contract. If the build runs long you can still be eligible — or you can miss a deadline because you stayed in the rental 'one more month'. Diary the occupancy rule the day you sign.

Insurance during the build

Contract works insurance, public liability, and then home insurance at practical completion are three different policies. Builders often carry some cover; it may not love your fixtures. Ask who insures the frame in a storm in month four. Lenders will ask for evidence at conversion. Getting this wrong is how a hailstorm becomes a dispute between three insurers and a credit team.

Also budget council bonds, temporary fencing, and the extra months of rent when the builder's '26 weeks' meets a wet winter. Construction files fail on cashflow as often as they fail on credit policy.