In short: When you win a property at a UK auction, you typically pay a 10% deposit on the day and must complete within 28 days. A mortgage almost never completes that fast, so buyers use auction finance — a bridging loan structured around the deadline — to release funds in time and avoid losing both the property and the deposit.
Auctions reward the prepared and punish the rest. The moment the hammer falls, you are contractually committed, the clock starts, and the penalty for missing completion is severe — you can forfeit your deposit and face further liability. This is the one scenario where finance speed isn’t a convenience; it is the deal.
Why a mortgage rarely works for auction property
Two reasons. First, time: a mortgage typically takes weeks to months — well beyond the 28-day window. Second, condition: a large share of auction lots are sold precisely because they are unmortgageable in their current state, whether through disrepair, a short lease or legal complications. A mainstream lender will decline; a bridge will not. For the wider comparison, see bridging loan vs mortgage.
The 28-day timeline, day by day
To complete on time, the work must run in parallel from day one. A realistic schedule looks like this:
- Before the auction (ideal): agreement in principle in place, solicitor briefed, legal pack reviewed.
- Day 0 — hammer falls: pay the 10% deposit; instruct your lender and solicitor immediately.
- Days 1–5: valuation instructed (desktop where possible to save days); KYC/AML completed.
- Days 5–15: underwriting and legals run together; lender issues the formal offer.
- Days 15–25: conditions satisfied; funds prepared for drawdown.
- By Day 28: completion — balance paid, charge registered, keys released.
The borrowers who miss the deadline almost always started the finance process after winning. The ones who complete comfortably treated funding as a pre-auction task.
What auction finance lenders need
- The auction legal pack for the lot — the single most useful document you can have ready.
- The security property details and the resulting LTV. See how LTV affects pricing.
- Your deposit and proof of funds for the balance not covered by the loan.
- A clear exit — refurbish-and-refinance, refurbish-and-sell, or refinance onto a mortgage.
- Identity and address verification (KYC/AML), ready in advance.
Costs to factor in
Auction finance is priced like other bridging — a monthly rate plus fees. Because the term is short (often just until refurbishment and refinance), the total interest cost can be modest relative to the opportunity. Build your numbers using the full breakdown in bridging loan rates & costs, and always include the auction house’s buyer’s premium and your legal fees in the deal appraisal.
How to be ready before the hammer falls
- Get terms in principle before you bid, against the specific lot.
- Have your solicitor review the legal pack in advance — surprises here kill deadlines.
- Confirm your maximum bid against the loan and your deposit, so you never win a lot you cannot fund.
- Line up valuation and KYC so they can be triggered on day 0.
Frequently asked questions
How long do I have to complete an auction purchase?
Usually 28 days from the fall of the hammer, with a 10% deposit paid on the day. Some lots run on a different timetable, so always check the legal pack.
Can I get auction finance after I’ve won?
Yes, but it’s tight. Starting after the auction leaves little margin for valuation and legals. Securing terms in principle beforehand is far safer.
What happens if I can’t complete in time?
You risk forfeiting your deposit and may face further liability under the contract. This is precisely why buyers arrange finance before bidding.
Can I buy an unmortgageable property at auction?
Yes — bridging finance is asset-led and can fund properties a mortgage lender would decline, then you refinance once the property is improved.
⚠ Important risk warning: Ponte Finance PLC is not regulated by the Financial Conduct Authority (FCA). Investments are not covered by the Financial Services Compensation Scheme (FSCS) or the Financial Ombudsman Service (FOS). Your capital is at risk. Past performance is not a reliable indicator of future results. Ponte Finance does not guarantee the buy-back of shares or early exit from investments. Your property may be repossessed if you do not keep up repayments on a loan secured against it. This article is for general information only and does not constitute financial advice.