Does pre-approval guarantee that the bank will lend me the money?

No. Pre-approval is a conditional indication of what a lender might lend you, based on what you’ve told it so far — it is not a guarantee of finance. Even with a pre-approval in hand, the final decision still depends on a satisfactory valuation of the specific property, verification of your documents, and your circumstances staying materially unchanged between pre-approval and settlement. See our guide to what pre-approval actually is for the full definition and how long it typically lasts.

Why does the specific property matter?

A pre-approval is usually assessed against a hypothetical purchase, not the exact property you end up buying. Once you have a contract, the lender orders its own valuation of that property — and if the valuation comes in below the contract price, your loan-to-value ratio (LVR, the loan amount as a percentage of the property’s value) rises. That can push you above the 80% LVR level at which lenders mortgage insurance (LMI) usually applies, or reduce the amount the lender is willing to lend against that particular property. Neither outcome breaches your pre-approval — it simply means the pre-approval was never a promise about this specific property.

Why do my own circumstances matter?

Between pre-approval and a final decision, a lender expects your circumstances to stay materially the same. A new debt, a change of job, reduced income or a new default on your credit file can all affect the final assessment, even where none of that seemed relevant at pre-approval stage. See our guide to home loans with a default on your credit file for how lenders generally handle an existing default — it’s one item in the assessment, not an automatic block, but it’s still the kind of change that can matter between pre-approval and settlement.

Why can the terms still move, even if nothing about you changes?

Lenders assess home loan applications under a responsible-lending framework (ASIC RG 209) that requires reasonable inquiries and verification rather than one fixed formula, plus a prudential interest rate buffer of at least 3 percentage points applied over the loan’s rate, per APRA’s guidance. The Reserve Bank held the cash rate at 4.35% at its June 2026 meeting — as at July 2026, that’s the current setting. None of this changes what you were told at pre-approval, but it shows that a lender’s final decision draws on settings that sit outside your own application.

What does this mean when you’re making an offer?

Pre-approval isn’t a blank cheque, but it isn’t meaningless either — it’s still useful evidence to an agent or vendor that you can likely borrow around the amount you’ve indicated. How much weight to put on a pre-approval when deciding whether to make an offer, and whether to build in extra buffer for a lower-than-expected valuation, depends on the property, the market and your own comfort with the risk. That’s a judgement call for you and your mortgage broker, not something this article can settle in advance.

How do you find out what your own pre-approval actually depends on?

The conditions attached to your specific pre-approval — valuation requirements, document checks, and anything else your lender flags — sit in the paperwork it gave you. A licensed mortgage broker can talk you through what your particular pre-approval does and doesn’t cover before you rely on it to make an offer.