Bidding at a property auction can include bids made on the seller’s behalf where the applicable conditions permit it. Before participating, establish how that auction is conducted and what a successful bid would commit you to do.
The RICS Common Auction Conditions, fifth edition, include a provision allowing the seller, auctioneer or another agent acting for the seller to bid below the reserve price, but not at or above it. The conditions acknowledge that bids below the reserve may be made on the seller’s behalf. They also explain that the buyer must purchase on the sale memorandum’s terms after a successful bid.
Those are provisions of the published conditions, not a claim that every auction uses identical terms or that all conduct described informally as “off-the-wall bidding” is lawful. Ask the auctioneer and your solicitor which conditions apply to the particular lot.
Prepare before the bidding starts
Have the legal pack and sale conditions reviewed in time to resolve questions. Check for updated documents and an addendum rather than assuming the first download remains complete. Arrange an appropriate property inspection and clarify how any proposed borrowing fits the transaction’s timetable.
Write down a maximum budget that includes the costs your advisers identify. The amount you bid is not necessarily the whole cost of the purchase. Keep contingencies visible rather than using every available pound as the bidding limit.
Do not infer value from competing bids
Apparent competition does not establish that a property is worth a particular amount to you. Base your decision on the evidence and your budget. If you do not understand a statement made during the auction, ask for clarification rather than trying to guess its meaning from the auctioneer’s gestures.
A spending limit is a useful discipline, but it does not remove the risk of buying a property with problems or becoming bound to terms you cannot meet. Setting a limit is not a substitute for preparation.
Understand the commitment
Before registering, ask when the contract becomes binding, what deposit and other payments are required, and the completion deadline. Different auction arrangements need their own checks. Obtain professional advice rather than assuming you can withdraw without consequences after a successful bid.
This article replaces an archive explanation that asserted buyers could not lose money through the practice. That assurance was unsafe. The useful approach is to understand the actual terms and decide whether to participate before the pressure of live bidding begins.
Source: RICS, Auctioneers selling real estate, incorporating Common Auction Conditions, fifth edition, particularly A3 and A5. Checked 4 November 2026.