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Can I bid at auction with just a pre-approval?
Bayley Clarke · Mortgage broker on the road · Last checked 16 October 2026 · 3 min read
The short answer
Yes, you can. But you're going to be nervous doing it, because if you win at auction, you cannot back out of that contract. You're in it for the long haul.
Pre-approval isn't the bank committing to that property. If you win, go back to the bank, and the valuation comes in low or something else goes sideways, you've got to find another solution or you risk losing your deposit. So the work has to be done well and truly before auction day.
The 60 second version, filmed from the driver's seat. The rest of this page is the detail underneath it.
Why auction is different
When you buy by private treaty, there's usually room between the offer being accepted and the contract going unconditional: a cooling-off period, a finance clause, time for the bank to do its formal approval. At auction, there isn't. The moment the hammer falls on your bid, you've bought it. You sign the contract on the day, the deposit goes down, and there's no cooling off.
That's the whole problem with bidding on just a pre-approval. Your pre-approval says the bank is comfortable with you and your finances. It hasn't said anything yet about the property you just bought, what it's worth, or whether the bank is happy to lend against it. Those answers only come after the auction, when you're already locked in.
What can go wrong after you win
After the auction, you go back to your bank to get the loan fully approved. The bank orders a valuation and checks everything over. A few things can go wrong at that point. The valuation might come in lower than what you paid. There might be something about the property itself the bank doesn't like. Or your circumstances might have changed since your pre-approval was issued.
If any of those mean the bank decides not to proceed, or decides to lend less than you need, you're still bound by the contract. You're going to need to find another solution fast, whether that's another lender or more of your own money. Otherwise, you're at real risk of losing your deposit, which at auction is often paid on the day.
Do the due diligence before you bid
So it's very important that you've done your due diligence on the property well and truly in advance of attending the auction. Pre-approval is part of that, because it means a bank has already looked at your income, your debts and your deposit. But it's only one part, and on its own it doesn't protect you from the property side.
Get a building and pest inspection done up front, so you're not finding a problem after the contract is signed. Do your own comparable sales, so you know what similar homes have actually sold for and you don't severely overpay. Auctions are emotional and it's easy to get excited and go past your number. Know your limit before you walk in, and stick to it.
The honest bit: it normally works out
People bid at auction on pre-approval all the time, and it's normally fine. Most of the time the valuation comes in where it should and the bank proceeds without any drama. I'm not trying to talk you out of auctions.
But you are unconditional at auction, and that's a different level of risk to an accepted offer with a finance clause. Just be careful. Do the work before the day, not after.
Bidding at auction soon?
A 30 minute call before the day. We check your pre-approval is solid, talk through what could trip up formal approval on that property, and set a limit your loan can actually support.
No cost to you. The bank pays me when a loan settles. · How I get paid
Next question
When do I pay the deposit to the agent, and where does it go?A small holding deposit when the offer is accepted, the rest at the end of your finance or cooling off period.
Related answers
The full guide: How to buy your first home What's the difference between buying at auction and buying on market? What is the 0.25% deposit during the cooling-off period when I'm buying a property in NSW? Do I need a conveyancer before I make an offer? What is the first step to buy your first home?Not your question? Book a call and ask it, or call 0437 189 939.