UK Property Auction Calculator: Guide Price, Reserve Ceiling (+10%), 10% Exchange Deposit & Stamp Duty (SDLT)
Calculate your maximum safe bid for any UK property auction lot: compare HM Land Registry market value against the published Guide Price, model the +10% ASA Reserve Price rule, compute your immediate 10% exchange deposit on the fall of the gavel, and factor in Stamp Duty Land Tax (SDLT) plus refurbishment costs in GBP.
Frequently Asked Questions: Buying at a UK Property Auction
What is the difference between a Guide Price and a Reserve Price in UK property auctions?
The Guide Price is the auctioneer's published indication of where bidding is expected to start, while the Reserve Price is the confidential minimum figure the seller will accept. Under UK Advertising Standards Authority (ASA) rules, the Guide Price cannot be set more than 10% below a fixed Reserve Price.
What happens when the hammer falls at an unconditional UK property auction?
The fall of the auctioneer's gavel creates an immediate, legally binding exchange of contracts. You must pay a 10% exchange deposit (subject to a typical minimum of £3,000–£5,000) plus the auctioneer's administration fee on the day, and complete the remaining 90% balance within 28 working days.
Why must I review the Special Conditions of Sale in the Legal Pack before bidding?
The Legal Pack (title register, local authority searches, replies to enquiries, and Special Conditions of Sale) often includes clauses requiring the buyer to reimburse the seller's legal fees, search fees, or a buyer's premium (1.5%–3.6% + VAT) on top of the hammer price.