Auction Finance

Buying property at auction can be one of the fastest ways to acquire below market value stock, but it demands finance that moves just as quickly. Traditional mortgages take 8 to 12 weeks. Auction deadlines are 28 days or less. Auction finance, usually a bridging loan, is designed to close that gap.

This guide explains how property auctions work, how to arrange finance before auction day, what lenders look for, and how to manage the process from winning bid to completion.

How Property Auctions Work

Property auctions in the UK are run by auction houses, either in a physical room or online. The process follows a set structure:

1. Catalogue published: The auction house releases a catalogue of lots, usually two to four weeks before the auction. Each lot includes a legal pack containing the title documents, local authority searches, special conditions of sale, and any known issues.
2. Viewing and due diligence: Buyers can view the properties and review the legal packs before the auction. This is the time to instruct a surveyor, check the legal pack with a solicitor, and arrange your finance.
3. Bidding: On auction day, bidding starts at the guide price or reserve. The highest bidder when the hammer falls wins the lot.
4. Exchange: The fall of the hammer constitutes exchange of contracts. At this point, the buyer pays a 10% deposit (sometimes a fixed amount, such as £5,000, with the balance of the deposit payable within a set period) and signs the contract.
5. Completion: The buyer must complete the purchase, paying the remaining balance, within the deadline specified in the contract. For traditional auctions, this is typically 28 days.

The key point is that exchange happens immediately. Once you win the bid, you are legally committed. If you fail to complete, you lose your deposit and may face legal action from the seller for any losses they incur.

The 28 Day Completion Deadline

The standard completion period for a traditional auction purchase is 28 days from the fall of the hammer. Some lots have shorter deadlines (14 or 20 days), and some allow longer (up to 56 days), but 28 days is the norm.

This timeline makes traditional mortgages impractical. Even the fastest mainstream mortgage applications take six to eight weeks from application to completion. Bridging loans can complete in 7 to 14 days, making them the standard financing method for auction purchases.

Traditional Auction vs Modern Method of Auction

There are two distinct auction formats in the UK, and they have different financial implications:

Traditional Auction

• Exchange happens at the fall of the hammer
• 10% deposit paid on the day
• 28 day completion deadline (standard)
• Legally binding from the moment the hammer falls
• Best suited to cash buyers or those with bridging finance pre arranged

Modern Method of Auction

• Winning bidder pays a reservation fee (typically 4% to 5% of the purchase price, plus VAT) rather than exchanging immediately
• An exclusivity period of 28 to 56 days is granted for the buyer to arrange finance and exchange contracts
• Exchange and completion then follow a more conventional timeline
• The reservation fee is usually non refundable if the buyer fails to complete
• This method allows time for a standard mortgage application, though bridging is still commonly used

The modern method appears lower risk because exchange does not happen on auction day. However, the reservation fee is substantial and non refundable. In 2026, there has been an increase in failed transactions under the modern method because buyers underestimate the financial exposure. If your mortgage application is declined after paying a 5% reservation fee on a £200,000 property, you lose £12,000 (£10,000 plus VAT).

Arranging Finance Before Auction Day

The single most important piece of advice for auction buyers is to arrange your finance before you bid. This means:

1. Speak to a broker: A broker experienced in auction finance can assess your situation, identify suitable lenders, and give you a realistic borrowing figure before you attend the auction.
2. Get a Decision in Principle (DIP): A DIP (also called an Agreement in Principle or AIP) is a conditional offer from a lender confirming they are willing to lend a specified amount, subject to a satisfactory valuation and legal review. Some bridging lenders can issue a DIP within hours.
3. Instruct a solicitor: Your solicitor should review the legal pack for any lot you are interested in before the auction. Discovering a title defect or restrictive covenant after you have exchanged can be costly.
4. Arrange your deposit: You need the 10% deposit available on auction day, in cleared funds. Most auction houses accept bank transfers on the day.
5. Set your maximum bid: Work backwards from the total cost (purchase price plus stamp duty plus refurbishment plus finance costs plus fees) and set a firm limit. Auction rooms are competitive, and discipline is essential.

What Lenders Look For

Auction finance lenders assess applications based on:

• The property: Location, condition, type, and current and potential value. Properties in poor condition or with non standard construction may still be acceptable, as bridging lenders are accustomed to lending on properties that mainstream lenders would decline.
• Loan to value: Most auction finance lenders offer up to 70% to 75% LTV. Some will go higher for strong applications with low risk properties.
• Exit strategy: How you will repay the bridging loan. Common exits include refinancing onto a buy to let or residential mortgage after refurbishment, or selling the property. A clear and evidenced exit strategy is the most important factor in the application.
• Borrower experience: First time auction buyers are not excluded, but experience with property investment or refurbishment projects is viewed favourably.
• Credit history: Checked but less of a barrier than with mainstream lending. Many auction finance lenders accept adverse credit.

Costs of Auction Finance

Auction finance (bridging loans) involves several cost elements:

• Interest rate: Typically 0.55% to 1.2% per month, depending on LTV, property type, and exit strategy. On a £200,000 loan, this equates to £1,100 to £2,400 per month.
• Arrangement fee: Usually 1% to 2% of the loan amount. This can often be added to the loan.
• Valuation fee: £300 to £1,500 depending on the property value and whether a physical inspection or desktop valuation is used.
• Legal fees: Both the lender’s and your own solicitor’s fees. Budget £1,500 to £3,000 in total for both sides.
• Exit fee: Some lenders charge 1% to 1.5% when the loan is repaid. Many do not charge an exit fee at all.
• Broker fee: If applicable, typically 0.5% to 1% of the loan amount.

For a 12 month bridging loan of £200,000 at 0.85% per month with a 1.5% arrangement fee, the total finance cost would be approximately £20,400 in interest plus £3,000 in arrangement fees plus valuation, legal, and broker costs. Total cost in the region of £26,000 to £28,000.

Bridging Loan vs Mortgage for Auction Purchases

A traditional mortgage is cheaper in terms of interest rates, but it is rarely fast enough for a traditional auction purchase. The comparison is straightforward:

• Bridging loan: Completion in 7 to 14 days. Interest 0.55% to 1.2% per month. Short term (6 to 18 months). Available for properties in poor condition.
• Standard mortgage: Completion in 8 to 12 weeks. Interest 4% to 6% per year. Long term (25 to 35 years). Requires the property to be habitable and in reasonable condition.

For modern method auctions, where the completion deadline is longer, a standard mortgage may be achievable if the property is mortgageable. However, the risk of mortgage delays or declines means many buyers still prefer bridging for certainty, then refinance onto a mortgage once the purchase is complete.

Refurbishment After Purchase

Many auction properties need work. Some are in poor condition, which is why they are being sold at auction in the first place. The refurbishment stage is where value is added.

Some bridging lenders offer additional funds for refurbishment on top of the purchase price. These are released in stages as work is completed, similar to a development finance drawdown. This can be useful if you plan to renovate the property and then either sell it or refinance onto a buy to let mortgage at the higher post works value.

For a detailed guide on this approach, see our page on buy refurbish refinance.

Risks of Buying at Auction

Auction purchases carry specific risks that buyers should be aware of:

• Deposit forfeiture: If you fail to complete, you lose your 10% deposit. The seller may also pursue you for losses.
• Hidden defects: Properties sold at auction are sold as seen. A building survey before the auction is strongly recommended but not always practical given the timeline.
• Overpaying: Auction rooms can be competitive. Setting a maximum bid in advance and sticking to it is essential.
• Finance falling through: If your bridging loan is not approved in time, you cannot complete. Arranging finance before the auction minimises this risk.
• Refurbishment cost overruns: Budget carefully and include a contingency of at least 10% to 15% above your estimated renovation costs.
• Title or legal issues: Problems identified in the legal pack after exchange are your problem. Always have a solicitor review the legal pack before you bid.
• Japanese knotweed, contamination, or structural issues: These can significantly affect value and mortgageability at the refinance stage. A survey before bidding, even a basic one, is money well spent.

Frequently Asked Questions

Can I buy at auction with no experience?
Yes. First time auction buyers are accepted by most bridging lenders. Having your finance and solicitor arranged before the auction demonstrates preparedness, which lenders view positively.

Do I need the full deposit on the day?
For a traditional auction, you need the 10% deposit in cleared funds on the day. Some auction houses also charge a buyer’s premium on top of the purchase price. Check the terms of the specific auction.

Can I use auction finance for commercial property?
Yes. Commercial bridging loans are available for commercial property purchased at auction. LTV is typically lower (65% to 75%) and rates may be slightly higher than for residential.

What if the property is unmortgageable?
Bridging lenders routinely lend on properties that mainstream mortgage lenders would decline, including properties with structural issues, no kitchen or bathroom, or non standard construction. The exit strategy needs to show how the property will become mortgageable (usually through refurbishment).

How quickly can I refinance after the auction purchase?
Most mainstream mortgage lenders apply a six month ownership rule, meaning they will not offer a remortgage until you have owned the property for at least six months. Some specialist lenders offer day one remortgage products. See our guide on buy to let mortgages for more detail.

For related guidance, see our pages on commercial bridging loans and buy refurbish refinance.

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