Property auction rules — how auctions work in NSW and Victoria

The short version

A property auction is a public, competitive sale run to a set of conduct rules: who can bid, how the seller is allowed to bid, and what the auctioneer must announce. If the bidding clears the reserve price and you make the highest bid, contracts are exchanged on the spot. There is no cooling-off period at auction in either NSW or Victoria, and the contract carries no "subject to finance" or building-and-pest conditions. Everything you would normally check afterwards has to be done before you bid.

The rules exist to keep the bidding honest — genuine bids only, the seller's own bids declared. Understanding them stops the room from rushing you into a number you didn't plan.

How an auction runs

The seller sets a reserve price — the lowest they'll accept — and usually keeps it confidential. Bidding opens, buyers compete, and once the reserve is reached the property is "on the market" and will sell to the highest bidder. If bidding stalls below the reserve, the property is passed in and doesn't sell under the hammer. When the reserve is met, the auctioneer's hammer falls, and that fall of the hammer forms a binding contract — you sign and pay the deposit then and there.

Who has to register to bid

This is the clearest NSW–Victoria difference. In NSW you must register as a bidder and collect a bidder's number before you can bid — you show identification and the agent records you on the bidders register. Victoria has no equivalent compulsory registration: you can generally turn up and bid, though you'll still need to identify yourself and be ready to sign if you win.

Vendor bids and the reserve

Both states let the seller bid on their own property to lift the price towards the reserve, but only openly. In NSW, under the Property and Stock Agents Act 2002 (NSW), the seller is entitled to make just one vendor bid at a residential auction, and the auctioneer must announce it as a vendor bid at the time. In Victoria, vendor bids are also permitted and the auctioneer must clearly declare each one as a vendor bid. Either way, a vendor bid is a signal that the property hasn't reached its reserve yet.

Dummy bidding is illegal

A dummy bid is a bid made by someone with no genuine intention to buy — typically a friend or associate of the seller placed in the crowd to inflate the price. Unlike a declared vendor bid, it isn't announced, and it's against the law in both NSW and Victoria. If the bidding feels manufactured, you can ask the auctioneer to identify any vendor bids.

No cooling-off — the rule that matters most

The single biggest thing to understand is that the cooling-off protections you'd get on a private-treaty sale do not apply at auction. In NSW there is no five-day cooling-off period when you buy under the hammer. In Victoria the three-day cooling-off period doesn't apply to an auction sale — or to a sale made within three clear business days before or after a publicly advertised auction, under the Sale of Land Act 1962 (Vic). Because the winning bid is unconditional the moment it's accepted, there's no window to sort out finance or inspections afterwards.

What to check before you bid

1. Read the whole contract first. The auction contract — every special condition — is the contract you're locked into. Our auction contracts guide walks through where the risk hides.
2. Confirm unconditional finance. Not a pre-approval letter — a lender's confirmed approval on this specific property, with the valuation done.
3. Order building and pest inspections. Done and read before the day, because there's no condition to fall back on.
4. Register in advance where you must. In NSW, sort your bidder registration and identification before auction day so nothing holds you up.
5. Set your limit and write it down. Decide the most you'll pay away from the heat of the room, and don't let a vendor bid or a fast auctioneer move it.

Common questions

Can I make my winning auction bid "subject to finance"?

No. An auction bid is unconditional — there's no finance clause and no cooling-off, so if you win you're committed to settle. That's why unconditional finance has to be in place before you bid, not after.

What is a vendor bid, and can I bid against it?

A vendor bid is a bid made on the seller's behalf to move the price towards the reserve, and the auctioneer must announce it. You can bid against it like any other bid — but treat it as a sign the reserve hasn't been reached yet, so the property isn't "on the market" at that price.

Do I really not have to register to bid in Victoria?

Victoria has no compulsory bidder-registration scheme like NSW's, so you can generally bid without registering in advance. You'll still need to identify yourself and be ready to sign and pay the deposit if you win. The registration guide covers both states side by side.

What happens if the property passes in?

If bidding doesn't reach the reserve, the property is passed in and doesn't sell under the hammer. The highest bidder is usually offered the first chance to negotiate with the seller. A sale agreed then isn't an auction sale, but the cooling-off exclusions around auctions can still apply — so don't assume you've regained a window to change your mind. This is also the point where a higher offer from someone else can still undo a deal that hasn't yet exchanged.

This is general information, not legal advice. Auction rules and cooling-off exclusions turn on the specific facts, so have the contract reviewed and confirm your position with a conveyancer or solicitor before you bid.