Buying property at auction is one of the most common ways to purchase real estate in Australia, particularly in Sydney and Melbourne. Auctions move fast, the stakes are high, and the rules are different from a standard private treaty sale.

The biggest difference: once the hammer falls and you are the highest bidder, the contract is binding. There is no cooling-off period. There is no finance clause. You must be ready.

This guide covers everything you need to know before you raise your bidder number — from organising your finance and reviewing the contract to understanding how bidding works and what comes next.

What Is a Property Auction?

A property auction is a public sale where interested buyers bid against each other for a property. The highest bidder above the vendor’s reserve price wins the right to purchase the property on the terms set out in the contract of sale.

Auctions are popular with vendors because they create competition, drive up prices, and result in an unconditional sale. For buyers, auctions offer transparency — you can see exactly what other buyers are willing to pay — but they also demand a higher level of preparation.

How Auctions Differ from Private Treaty Sales

In a private treaty sale, you can negotiate conditions such as a finance clause, a building inspection clause, or a longer settlement period. You also benefit from a cooling-off period in most states, which gives you time to walk away if circumstances change.

At auction, none of these protections apply. The contract is unconditional from the moment bidding closes. This is why preparation — particularly finance preparation — is the single most important thing you can do before auction day.

Before Auction Day

The work you do in the weeks before auction day determines how confidently you can bid and how safely you can buy. Rushing this preparation is one of the most common and costly mistakes buyers make.

Inspect the Property Thoroughly

Attend every open inspection available before the auction. You cannot withdraw from an auction contract because a building inspection later reveals a problem, so all due diligence must be completed beforehand.

Arrange a private building and pest inspection before auction day. The cost is typically between $400 and $700 and is money well spent. If significant defects are found, you can walk away before the auction rather than being locked into a purchase with hidden problems.

Review the Contract of Sale

The vendor’s agent is required to make the contract of sale available before the auction. Do not wait until auction day to read it. Have your solicitor or conveyancer review the contract well in advance so you understand the settlement terms, any special conditions, and what you are agreeing to.

Pay particular attention to the settlement period, any inclusions or exclusions, and whether there are any outstanding issues such as easements, zoning restrictions, or heritage listings.

Research the Market

Attend other auctions in the area before the one you plan to bid at. Watching how auctions run, how auctioneers manage the room, and how other bidders behave gives you a significant advantage on the day.

Research recent sales of comparable properties in the same suburb. Understanding what similar properties have sold for helps you set a realistic maximum bid and avoid overpaying in the heat of the moment.

Getting Your Finance Ready

This is the most critical part of buying at auction. Your finance must be confirmed before you bid — not after.

Why Pre-Approval Matters at Auction

Pre-approval tells you how much a lender is willing to lend you based on your income, expenses, deposit, and credit position. It gives you a clear upper limit for your bidding and confirms that a lender is prepared to support your purchase.

Without pre-approval, you are bidding blind. You may win a property at a price your lender will not support. At that point, you have signed an unconditional contract and paid a deposit with no way out.

Pre-Approval vs Formal Approval

Pre-approval is a conditional assessment. Formal approval is issued once the lender has assessed a specific property, including its valuation. For auction purchases, pre-approval is what you need before bidding. Formal approval follows once the property is secured and the lender completes their assessment.

To understand the difference in more detail, read our guide on pre-approval vs final approval.

Know Your Maximum Before You Bid

Set your maximum bid before you walk into the auction room and commit to it. Auctions are designed to create urgency and competition. Bidders regularly exceed their budget in the moment and regret it later.

Your maximum should account for the purchase price plus stamp duty, legal fees, building inspection costs, and any immediate repairs or improvements you plan to make.

Use our guide on how banks calculate your borrowing power to understand what drives your borrowing capacity and how to strengthen it before applying.

Have Your Deposit Ready

The standard auction deposit is 10 per cent of the purchase price, payable on the day. You need this available as cleared funds — cash, bank cheque, or a deposit bond where accepted by the vendor. Personal cheques and EFTPOS are not always accepted.

Confirm the acceptable deposit payment methods with the agent before auction day. Some vendors accept a lower deposit by prior arrangement, but this must be negotiated and confirmed in writing before the auction begins.

Legal Preparation

Your solicitor or conveyancer is as important as your mortgage broker in the lead-up to an auction. Engage them early — at least one to two weeks before auction day — so they have time to review the contract properly.

What Your Solicitor Should Check

Ask your solicitor to review the contract for the settlement date and whether it works for your circumstances, any special conditions attached to the sale, title searches for encumbrances, easements, or caveats, and any strata or body corporate matters if you are buying an apartment or townhouse.

Negotiating Contract Terms Before Auction

You cannot add a finance clause to an auction contract, but you can sometimes negotiate other terms before the auction takes place. For example, you may be able to request a different settlement period if the vendor’s preferred timeline does not suit your circumstances.

Any agreed changes must be made in writing before the auction and incorporated into the contract. Once bidding begins, the contract terms are fixed.

What Happens on Auction Day

Auction day moves quickly. Knowing what to expect helps you stay calm and focused when it matters most.

Registration

You must register with the selling agent before bidding begins. Bring photo identification such as a driver licence or passport. You will receive a bidder number, which you hold up or display when placing a bid. Registration is typically open from 30 minutes before the auction starts.

The Auction Opens

The auctioneer opens the auction with a summary of the property and the auction rules. They will announce the reserve price has been set, though the actual reserve amount is confidential.

The auctioneer will also announce if a vendor bid is placed during the auction. A vendor bid is a bid made on behalf of the seller to help move bidding toward the reserve. Auctioneers are permitted to make one vendor bid, and it must be clearly announced.

How Bidding Works

Bidding begins when the auctioneer calls for an opening offer. Anyone can start, including you. Some buyers prefer to open with a strong bid to signal confidence. Others prefer to wait and observe before entering.

Bidding Strategy

Bid in clear, confident increments. Hesitant or fractional bids can slow the auction and signal uncertainty. If you are serious about the property, bid decisively.

Do not get drawn into emotional bidding wars that push you beyond your maximum. Decide your upper limit before the auction and hold it. If another bidder exceeds your limit, let them win. The property is not worth more than what you can safely afford and finance.

Bidding on Behalf of Someone Else

If you cannot attend in person, you can appoint a representative to bid on your behalf. This must be arranged in advance with written authorisation. Telephone bidding may also be available — confirm with the selling agent before auction day.

What Happens When You Win

When the auctioneer announces the property sold to your bid, you have entered into a legally binding contract. There is no time to reconsider, seek additional finance, or negotiate new terms.

Signing the Contract

You sign the contract of sale immediately after the auction concludes. Both you and the vendor sign. The contract becomes binding at this point.

Paying the Deposit

You pay the deposit on the spot — typically 10 per cent of the purchase price. The deposit is held in trust by the vendor’s agent until settlement.

Settlement

Settlement occurs on the date set out in the contract, typically 42 days from auction day though this varies. On settlement day, your lender releases the loan funds, the balance of the purchase price is paid to the vendor, and ownership transfers to you.

Between winning the auction and settlement, your lender will complete their formal assessment including a property valuation. Maintain your financial position during this period. Do not take on new debt, change jobs, or make large purchases that could affect your loan approval.

What If the Property Passes In?

If bidding does not reach the vendor’s reserve price, the auctioneer may declare the property passed in. The highest bidder at the time of passing in has the first right to negotiate with the vendor after the auction.

This can be an opportunity. Vendors who have been through an unsuccessful auction are often more willing to negotiate on price and terms. If you were the highest bidder, enter post-auction negotiations promptly and calmly.

If you were not the highest bidder, you may still be able to make an offer if negotiations between the vendor and the highest bidder break down. Stay nearby after the auction and speak with the agent.

Common Mistakes to Avoid

Most auction mistakes come down to inadequate preparation. The following are the ones that cost buyers the most.

Bidding Without Confirmed Finance

This is the most serious mistake. Winning an auction without the ability to settle means losing your deposit and potentially facing legal action. Pre-approval is not optional at auction — it is essential.

Skipping the Building Inspection

You cannot exit an auction contract because of a building defect found after the sale. If you skip the inspection before the auction and a major problem is found during settlement, you are still legally bound to complete the purchase.

Not Having the Deposit Accessible

Winning the auction and then not being able to pay the deposit on the day puts you in breach of the contract immediately. Make sure your deposit funds are in a readily accessible account or arranged as a bank cheque before you leave for the auction.

Letting Emotion Drive the Bidding

Auctions are designed to create urgency. Set your maximum before you go in and do not exceed it regardless of how the bidding unfolds. Paying more than you can comfortably service is a financial risk that follows you for the life of the loan.

Not Reading the Contract Before Auction

The contract of sale is available before the auction. Reading it — or having your solicitor read it — after you have already signed is too late. Understand every term before you bid.

Frequently Asked Questions