Guide
How to Finance an
Auction Purchase
The completion countdown, typically 20 business days, starts at hammer fall. Here's how to have your finance lined up before you even bid.
Why Bridging Finance Is the Only Realistic Option for Auctions
Mortgage lenders work to their own timeline, not yours. A standard residential mortgage takes 8-12 weeks from application to completion. A buy-to-let mortgage often takes longer. When you buy at auction, you typically have 20 business days to complete: four working weeks. No mainstream mortgage lender will reliably hit that window. That is the job our auction bridging loans are built for.
Bridging finance exists precisely for this scenario. We typically complete auction purchases in 5 to 14 working days. That assumes a pre-instructed valuation and an AIP (agreement in principle) in place. Indicative terms come within 4 hours on straightforward deals, often quicker. The loan is short-term, typically 6-12 months, giving you time to either refinance onto a mortgage, complete renovation works, or sell the property on.
If the property needs work (and most auction properties do), a mortgage lender likely won't touch it anyway. Uninhabitable, no kitchen, damp issues, short lease: none of these is a problem for a bridging lender. They're looking at the asset and your exit strategy, not whether the boiler has a gas safety certificate.
Some buyers ask about getting auction finance direct from a lender, cutting out the broker. You can, and some lenders deal directly with borrowers. A specialist broker working with the 158 lenders active in the market can compare terms across lenders, which a direct application to a single lender cannot. On a completion deadline of typically 20 business days, spending days chasing one lender's underwriting team is not a trade-off worth making.
Getting Finance Ready Before Auction Day
The biggest mistake auction buyers make is waiting until they've won a lot before thinking about finance. By that point, you've already lost 2-3 days of a completion window that is typically 20 business days.
Here's what to prepare in advance:
1. Your identity documents
Passport, proof of address, source of wealth documentation. Have these scanned and ready, because AML checks hold up more deals than valuations.
2. Deposit funds
You'll need the 10% auction deposit from your own funds on the day. The bridging loan covers the remaining 90% (subject to LTV). Confirm your deposit is in a readily accessible account.
3. The auction legal pack
Download and send this to your solicitor before auction day. If your solicitor raises title issues after the hammer falls, you've lost valuable days. Get the legal pack reviewed first.
4. Your exit strategy
Every lender will ask how you plan to repay. "Refinance to BTL mortgage", "sell after refurbishment", or "retain and refinance": know your answer and have rough numbers.
The Timeline: Hammer Fall to Completion
Here's what a well-organised auction purchase looks like when you've prepared properly:
Day 0: Auction day
Hammer falls, you pay the 10% deposit. Your broker (us) submits the full application to the lender that same afternoon with the signed memorandum of sale.
Day 1-2: Formal offer issued
Lender reviews the application, issues a formal facility letter. Valuation is instructed immediately. Your solicitor is already working on title because they reviewed the legal pack pre-auction.
Day 3-7: Valuation and legal
Surveyor inspects the property and reports. The lender's solicitor raises requisitions. Your solicitor responds. On a clean deal, this stage can be compressed to 3-4 days.
Day 7-14: Completion
All conditions satisfied, funds released, completion happens. You own the property with time to spare on your completion deadline, typically 20 business days.
Case study: an auction purchase in Liverpool.
What It Costs
Lenders know where they stand on an auction purchase: there's a binding contract, a known completion date, and the property has been publicly marketed. Here is what the costs look like on a straightforward auction purchase:
Monthly interest rate
Priced case by case (rolled up)
Arrangement fee
1% - 2% of the loan
Valuation
Nil to about £100 for a desktop valuation and up to about £2,000 for a full one, plus VAT, on a loan of about £200k (depending on the property)
Legal fees
about £1,500–£2,000 plus VAT for each side on a loan of about £200k (more on larger or complex loans)
Exit fee
0% - 1% (many lenders charge none)
Our fee
Generally 1% of the gross loan, paid on completion
Interest is often rolled up, so there are often no monthly payments, though some lenders let you pay monthly. Everything is repaid when you exit the loan. Use our bridging calculator to model the total cost for your specific deal. Auction bridging is priced case by case, so we do not quote a rate for it here. For scale, take a £375,000 loan over 6 months at 0.76% a month, the average published rate for standard residential bridging across 42 lenders, as at 25 October 2026. Rolled-up interest on that loan is £17,100.
Standard bridging: first charge, under 50% loan-to-value, straightforward cases. Rates as at 29 October 2026.
Common Mistakes That Kill Auction Deals
Forgetting stamp duty in your sums
SDLT is due on completion and comes from your own funds, because the bridging lender won't finance it. On a £400k investment property, you're looking at £30,000 in stamp duty at current England rates (including the 5% surcharge). Budget for it or the deal falls apart at the last hurdle.
Not having a solicitor instructed
Your solicitor needs to be on the lender's approved panel and ready to act immediately. Finding a solicitor after the auction costs you a week. We can recommend panel solicitors experienced in auction completions.
Bidding beyond your limit
If you've budgeted for £400k at 75% LTV, that means a £300k loan. Bidding £450k means you need £112,500 in cash (deposit plus the gap) rather than the £100k you planned for. Know your ceiling before you bid.
Tips for First-Time Auction Buyers
Auction rooms move fast and the experience can be overwhelming the first time. A few things that'll keep you on solid ground:
Attend an auction as a spectator first. Watch how the process works, see how quickly lots move, understand the auctioneer's patter. Most auction houses also run online bidding now. We also work with auction houses whose buyers need finance agreed before the sale. The same rules apply, but you can bid from your desk.
Set your maximum bid and stick to it. The numbers you've modelled with your broker (purchase price, refurb cost, end value, finance costs) only work at the right price. Auction fever is real, and overpaying by £30k wipes out your margin.
Read the special conditions of sale in the legal pack. Some lots have completion deadlines shorter than the typical 20 business days, non-standard deposits, or buyer's premiums on top of the hammer price. All of these affect your funding requirement.
Talk to us before auction day. We'll review the lot, confirm what's financeable, and have everything ready so that when the hammer falls, we're submitting your application that afternoon. For why the clock matters so much, see the completion timeline on our auction finance product page. Arrange a call to discuss your upcoming auction purchase.
Related Finance
Got Your Eye on a Lot?
Send us the lot number and the legal pack before you bid, and we'll tell you what's financeable and what it will cost. If we can respond immediately we will, otherwise we'll call you back the same working day, often within a couple of hours.