A standard residential or buy-to-let mortgage typically takes eight to twelve weeks or longer from application to completion. Auction contracts require you to complete within 28 days. The fundamental problem is not willingness but process: a mortgage lender must conduct an affordability assessment, commission a valuation, carry out legal review, and issue a formal offer before funds can be released. Running all of these steps within 28 days is not achievable within a standard mortgage application process.

There is a narrow exception. If you already have a mortgage offer in place on a property at the same lender, or if the specific lot is one where a very fast decision mortgage exists, completion within 28 days may occasionally be possible. In practice, this is rare. Our guide to bridging vs mortgage for auction purchases covers the comparison fully, including when a mortgage might genuinely be feasible.

Technically yes, but it significantly increases your risk. Starting a bridging application after the hammer falls means you have already exchanged contracts, paid your 10% deposit, and are legally committed to completing within 28 days. If the finance falls through or the lender's valuation comes in lower than expected, you face forfeiting your deposit and potentially additional legal liability. The 28-day clock is already running from day one, so every day spent identifying a lender rather than progressing the application reduces the available timeline.

The recommended approach is to identify a lender or broker before the auction, get indicative terms on the type of asset you are targeting, and attend with a clear maximum bid based on those terms. This does not guarantee finance on any specific lot, but it means that when you win, the relationship and indicative paperwork are already in place and the formal application can be submitted within hours rather than days.

If a lender declines after exchange at auction, you are in a difficult position. You have exchanged contracts and have a legal obligation to complete. Failure to complete forfeits your 10% deposit and in some cases exposes you to additional liability: the vendor can resell the property and claim damages if it sells for less than your agreed price. This is why pre-auction preparation matters so much. A decline at the formal application stage, after you have already exchanged, leaves very little time to find an alternative lender and still complete within the deadline.

Having worked with a broker before the auction, and having had the legal pack reviewed by your solicitor for issues that could affect lender appetite, significantly reduces the likelihood of a post-exchange decline. Our pre-auction checklist and the guide to how legal packs affect bridging are the two most important resources for managing this risk.

It is also important to understand that forfeiting the 10% deposit is not necessarily the limit of your liability if you fail to complete. The vendor has the right to resell the property and then pursue you for any shortfall if the resale price is lower than your agreed purchase price, plus their costs of resale. On a £400,000 lot, this could run to tens of thousands of pounds beyond the deposit itself. This is not a theoretical risk: it is one that vendors pursue in serious cases of non-completion.

The standard auction deposit is 10% of the purchase price, paid on the day the hammer falls before you leave the auction room. It can be paid by bank transfer, credit card, or debit card depending on the auction house. This deposit is non-refundable if you fail to complete for any reason, including lender decline, change of mind, or inability to secure finance. Some auctions have different deposit requirements, which are detailed in the special conditions of sale. Always check the legal pack for the specific deposit requirements of each lot before bidding.

The 10% deposit is entirely separate from the bridging finance. The bridging loan covers the remaining balance of the purchase price and any costs that are funded through the facility. You must have the deposit funds immediately accessible on auction day, not committed elsewhere or sitting in accounts that cannot be accessed quickly.

Yes. Most UK property auctions now offer online bidding, either as a standalone online auction or as a hybrid allowing simultaneous room and online participation. The contractual obligations are identical: winning an online bid is as legally binding as winning in the room, and the 28-day completion deadline applies in the same way. The deposit is collected by bank transfer or card immediately upon winning.

Online auctions have also introduced the modern method of auction, which operates on a slightly different structure: a reservation fee is paid by the winning bidder, and the buyer then has a longer period to exchange contracts (typically 28 days to exchange) and a further period to complete. This longer timeline may make conventional mortgage finance viable in some cases. Always check whether the lot is being sold by traditional auction or modern method, as the timelines and deposit obligations differ significantly.

Bridging finance covers the balance of the purchase price after the 10% deposit, up to the lender's maximum LTV. For a standard residential property, most lenders will advance up to 70 to 75% of the purchase price, meaning you need to fund the 10% deposit plus a further 15 to 20% from your own resources in addition to the bridging loan. These are illustrative ranges only; actual LTV depends on the lender, property type, and your borrower profile.

On non-standard properties, commercial lots, or properties with significant title or condition issues, available LTV is often lower, meaning a larger proportion of the purchase price must come from your own funds. Working out how much you need to contribute from your own resources, and confirming those funds are accessible, is a key part of pre-auction preparation. Our guide to gross vs net borrowing in bridging finance explains how the net advance you receive differs from the gross loan due to retained interest and fees.

Adverse credit does not automatically prevent an auction bridging application. Bridging underwriting focuses primarily on the asset and the exit strategy rather than the borrower's credit history, which means some adverse markers that would block a mortgage application are workable in a bridging context. The nature and recency of adverse matters: settled CCJs, older defaults, and historic missed payments are viewed differently from active IVAs or recent severe defaults. Our guide to bridging loans for adverse credit explains how underwriting differs and what types of adverse are typically workable.

In an auction context, the complication with adverse credit is the compressed timeline. Identifying a lender who will consider your credit profile needs to happen before auction day, not after. A specialist broker who knows which lenders have appetite for adverse credit cases is essential for this audience.

The modern method of auction (MMoA) is a different contractual structure from traditional auction. Rather than exchanging contracts and paying a 10% deposit immediately when the hammer falls, the winning bidder pays a non-refundable reservation fee (typically 1 to 3% of the purchase price) and then has a defined period to exchange contracts (usually 28 days) and a further period to complete (usually a further 28 days). The total time from winning bid to completion is therefore typically 56 days rather than 28.

This longer timeline changes the finance options. With 56 days available and a period before exchange contracts are signed, it may be possible to progress a conventional mortgage application rather than bridging, particularly for standard residential property in acceptable condition. Bridging is still commonly used for MMoA purchases, especially where the property requires works or the borrower prefers the speed certainty that bridging provides. Always check which auction method applies to specific lots, as the deposit structure and timeline obligations are materially different.

Generally no, and this catches out many first-time auction buyers. The 10% deposit paid on auction day is expected by bridging lenders to come from the borrower's own resources, not from a loan. Funding the deposit from borrowed money raises immediate questions about true equity contribution: if the entire purchase including the deposit is debt-funded, the lender's risk exposure is effectively 100 percent, which falls well outside standard bridging LTV criteria. Most bridging lenders will ask where the deposit funds are coming from, and a loan or credit card advance as the source is likely to result in a decline or a significantly reduced facility.

The 10% deposit must therefore be sitting in a readily accessible account before auction day, not in notice accounts, fixed-term deposits, or otherwise committed funds. If you do not have 10% of your target lot's anticipated value available in accessible cash, you are not in a position to bid safely at a traditional auction. The bridging loan covers the remaining balance after the deposit, up to the lender's LTV threshold, not the full purchase price.