At an auction, the auctioneer will read the terms and conditions of the sale aloud and announce if a reserve price has been set. They must also state whether the seller has reserved the right to bid during the auction. This is called 'vendor bidding' and it is only allowed under strict circumstances, such as when the property being auctioned has a reserve price; when the reserve price has not yet been met; and the auctioneer has made it clear that the bid being made is a vendor bid. They must do this by saying, 'this is a vendor bid' rather than using any jargon.
Auctioneers sometimes use vendor bids as a way to start off the bidding, or to move the bidding towards the reserve price.
Vendor bids can be made by the auctioneer, or another person working on behalf of the seller, such as a real estate agent. An auctioneer can also use a pre-auction offer to start the bidding.
The auction continues until there is only one bidder left. At that stage, if the reserve price is reached or beaten, the highest bidder will be the successful buyer.
If the reserve price isn't reached, the seller can tell the auctioneer to stop the auction without selling the property.
If the auction is stopped without a sale, the highest bidder may have the opportunity to negotiate with the seller (via their agent) after the auction. If this happens, the terms and conditions of the auction no longer apply and you can negotiate new ones.
For independent advice on buying property, check out www.buyingahome.reaa.govt.nz