Auction finance: the hammer falls, and you have 28 days

At a property auction, contracts exchange the moment the gavel drops — your 10% deposit is committed, and completion is typically 28 days later (some modern-method lots allow 56). Miss the date and the deposit is gone. Ordinary mortgages rarely move that fast; auction purchases run on bridging — and the winners arrange most of it before they bid.

The only rule that matters: prepare before the room

The 28 days are ample for a prepared buyer and brutal for an unprepared one. Before auction day: read the legal pack and get your solicitor's eyes on it (title problems sink funding faster than anything); get a decision in principle from a bridging lender against the specific lot or your criteria; instruct a solicitor who actually does auction work; and know your maximum bid as a number that still works after finance costs. With that done, the post-hammer month is administration, not panic.

The day-by-day, realistically

• Days 0–2: confirm the win to your lender; formal application against the actual lot; valuation instructed immediately (this is the critical path — a lender with in-house or desktop valuation options buys you a week).
• Days 3–10: valuation done; underwriting runs on the pack you prepared — ID, company accounts, exit evidence, schedule of works if refurbishing.
• Days 10–18: formal offer; solicitors exchange enquiries — the stage where an auction-experienced solicitor earns their fee twice over.
• Days 18–26: report on title, conditions satisfied, funds requested.
• Day 27–28: completion, ideally a day early. Buffer is a strategy, not a luxury.

What it costs, and what decides the rate

Auction bridging prices like any bridge: monthly interest (asset and leverage dependent), an arrangement fee around 2%, valuation and both sides' legals — see how bridging pricing really works. Loan-to-values commonly reach 70–75% of the lower of purchase price and valuation — auction bargains don't magically increase day-one leverage. And the exit decides everything: refinance onto a term mortgage, refurbish-and-sell, or refurbish-and-refinance — lenders price the exit's credibility, not your enthusiasm in the room.

The deposit-losing mistakes

• Bidding first, arranging after — the classic. Fixable, expensively, sometimes not at all.
• Skipping the legal pack — restrictive covenants, short leases, missing access rights: things lenders decline mid-clock.
• A high-street solicitor learning auctions on your file.
• Unmortgageable quirks unpriced — no kitchen, non-standard construction, flying freeholds: bridging handles them, but the exit must too.
• No buffer — completion planned for day 28 means a single query completes on day 31, without a property.