Auction Finance: Meeting the 28-Day Deadline

Why auction purchases need specialist finance

Auction contracts are unconditional the moment the hammer falls, and most UK auction houses set completion at 28 calendar days from exchange with no scope to extend, so a standard commercial mortgage application, which typically takes 6 to 12 weeks, cannot complete in time. Auction finance lenders underwrite against the property and a clear exit route rather than a full trading history review, which lets them move from application to funds in as little as 7 to 14 days.

Missing the deadline means forfeiting the deposit, usually 10% of the purchase price, and the seller can pursue the buyer for any shortfall if the lot is resold at a lower price. This is why auction finance is arranged before bidding, not after the lot is won.

How the 28-day timeline actually runs

The clock starts at exchange, which happens automatically when the auctioneer's gavel falls, and every day of the 28 counts including weekends and bank holidays, so delays in legal work or valuation eat directly into the deadline. A borrower who has agreed terms in principle before the auction, with the lender's solicitor already instructed and a valuation booked for the specific lot, can usually complete within 3 to 4 weeks of exchange.

Lenders that specialise in auction completions run legal work in parallel rather than sequentially: valuation, title checks and drawdown documentation proceed at the same time once the winning bid is confirmed, which is the main reason they can beat the deadline where a standard mortgage lender cannot.

What auction finance costs

Auction bridging typically runs from around 0.55% to 1.1% per month depending on loan-to-value and the strength of the exit, plus an arrangement fee of 1% to 2% of the loan and a lender's legal fee, so total cost is driven far more by speed and certainty than by headline rate. At current market pricing this sits above the Bank of England base rate of 4.50%, reflecting the short-term, higher-risk nature of unconditional auction contracts.

Most facilities also carry an exit fee of 0% to 1% and a minimum term of one to three months even if the borrower refinances early, so the total cost of a short hold should be calculated on the full facility, not just the monthly rate advertised.

Eligibility for limited companies and LLPs

Auction finance for FundBiz-eligible borrowers, limited companies, LLPs and partnerships of 4 or more, is assessed primarily on the property and the exit plan rather than three years of accounts, which suits businesses buying their first commercial premises or adding an investment property. Lenders will still want a Companies House check, director or member identity verification, and confirmation of how the loan repays, whether refinance, sale, or trading income.

A limited company with no trading history, such as a newly formed special purpose vehicle set up specifically to hold the property, can typically still qualify provided a personal guarantee is available and the loan-to-value sits within the lender's cap, usually 65% to 75% for commercial auction lots.

Auction finance vs standard bridging

Auction finance is a subset of bridging built specifically around the fixed exchange date and the risk of deposit forfeiture, whereas standard bridging is arranged for property already under a negotiated contract with a flexible completion date. The practical difference is speed of underwriting: auction lenders pre-agree terms before the sale and hold funds ready to release the moment the lot is confirmed, while standard bridging follows a more conventional application-to-offer sequence.

Pricing and loan-to-value bands are broadly similar between the two, so the choice comes down to timing certainty rather than cost; a borrower buying at auction should not default to a generalist bridging lender without first confirming they can genuinely complete inside 28 days.

Exit routes once the purchase completes

Most auction finance exits either to a standard commercial mortgage once the property has a trading history or updated valuation, or to sale proceeds where the strategy was buy-refurbish-sell. Refinancing onto a term facility typically happens within 6 to 12 months, once the business can evidence income from the property or trading activity within it, at which point rates fall closer to standard commercial mortgage pricing.

Lenders will ask for the exit plan in writing before completion, and a weak or undefined exit is the most common reason an application is declined, even where the loan-to-value and deposit are otherwise acceptable.

Common pitfalls at auction

The most frequent mistake is bidding before finance is confirmed in principle, which leaves no room to negotiate terms once the 28-day clock is already running against a firm legal obligation. Underestimating additional costs, stamp duty land tax, buyer's premium (typically 2% to 2.5% plus VAT), and legal fees, on top of the deposit, is the second most common cause of a funding shortfall discovered mid-transaction.

A legal pack review before bidding, covering title issues, planning restrictions and any tenancy in situ, should happen alongside the finance conversation, since a lender will decline or reprice a loan if problems surface in the pack after exchange that were not disclosed at application.

Step-by-step

1. Agree terms in principle with an auction finance lender before bidding, based on the lot's guide price and loan-to-value cap
2. Instruct the lender's solicitor and book a valuation for the specific lot ahead of the sale
3. Bid and exchange at auction, triggering the unconditional contract and the 28-day completion clock
4. Provide the lender with identity, Companies House and exit-route documentation immediately after exchange
5. Complete legal and valuation checks in parallel to keep pace with the fixed deadline
6. Draw down funds and complete within 28 days, then confirm the agreed exit route (refinance or sale)

Example

Frequently asked questions

By Adam Parker, Director, Best Business Loans Ltd. Last reviewed 2026-07-19.