When do you need it, what does it cost, how do you arrange it in 28 days, and what happens if your exit strategy fails? The complete UK guide.
Most UK auction houses require completion within 20–28 working days of the auction. Standard residential and buy-to-let mortgages take 4–8 weeks. This gap makes bridging finance the most common funding solution for property auction purchases.
Bridging is expensive, fast, and unforgiving. Used correctly — with a clear, verified exit strategy — it is a powerful tool. Used incorrectly, with an exit that doesn't materialise, it can turn a promising purchase into a financial disaster. This guide covers everything you need to know before committing.
Bridging finance is a short-term secured loan — typically 3–18 months — used to "bridge" a gap between needing funds now and a longer-term source of finance becoming available. The loan is secured against the property being purchased (first charge) and sometimes against additional assets.
Open bridge: No fixed exit date. Interest rolls up monthly. Used when the exit (refinance or sale) has no definite timeline. Typically higher rates.
Closed bridge: Fixed end date, with a confirmed exit (e.g. sale completion in 6 weeks). Lower risk for the lender, often better rates.
For auction purchases, most bridges are open or have a soft exit date. The lender advances funds within 7–14 working days, you complete the purchase, then work towards your exit — whether that is a standard mortgage, a BTL mortgage, or a sale after refurbishment.
Bridging lenders are not regulated in the same way as standard mortgage lenders. Always use a broker who is FCA regulated and specialises in bridging finance — they will have access to the full market and can negotiate terms on your behalf.
Short completion deadline: The most common reason. Standard mortgages cannot complete in 28 days. If you need to complete at auction speed, bridging is usually the only option unless you have cash.
Uninhabitable property: Most residential and BTL lenders will not lend on a property without a working kitchen or bathroom (classed as uninhabitable). Bridging lenders have more flexible criteria and will lend on distressed properties — allowing you to complete, refurbish, and then refinance onto a standard mortgage once the property is in habitable condition.
Non-standard construction: If the property is timber frame, concrete panel, steel frame, or another non-standard construction, most high-street lenders decline. A bridging lender may accept it while you assess the long-term financing options.
Short lease: If the property has a lease below the lender's minimum (typically 70–85 years), standard mortgages are unavailable. Bridging allows purchase, after which you immediately begin the lease extension process (now possible immediately post-purchase under the 2024 Act), then refinance once the lease is extended.
Property in poor condition: Properties requiring significant refurbishment — new roof, rewiring, damp treatment — are often declined by standard lenders until works are complete. Bridging provides the purchase funds; a standard or BTL mortgage follows after works.
Bridging is significantly more expensive than standard mortgage finance. The costs fall into three categories:
Monthly interest: Typically 0.75–1.5% per month, depending on LTV, property type, and borrower profile. This can be served monthly (paid each month) or rolled up (added to the loan and repaid at exit).
Arrangement fee: Usually 1–2% of the loan amount, payable on drawdown or deducted from the advance. On a £150,000 loan, this is £1,500–£3,000.
Exit fee: Some lenders charge 0.5–1% of the loan on repayment. Not universal — negotiate this out where possible.
Other costs: Lender's valuation fee (£300–£700), lender's legal fees (£600–£1,200), your own broker and legal fees.
This cost must be factored into your maximum bid calculation. If you are refurbishing and refinancing, the bridge cost reduces your profit margin. If the property is at risk of a lower-than-expected refinance valuation, you may not be able to repay the bridge in full from the new mortgage, requiring additional cash at exit.
Exit strategy verification is the most important step before committing to bridging finance. The bridge must be repaid — usually within 12 months. If your exit fails, the monthly interest compounds, default rates kick in, and ultimately the lender can repossess and sell the property. Always verify your exit before bidding.
Exit 1 — Refinance to residential mortgage: After purchase and any refurbishment, the property is revalued and a standard residential mortgage is arranged to repay the bridge. Verify: does the property meet standard lender criteria (construction type, condition, lease length)? Will the refinance value be sufficient to repay the bridge plus costs?
Exit 2 — Refinance to BTL mortgage: The BRRR strategy (Buy, Refurbish, Refinance, Rent). After refurbishment, the property is let and refinanced onto a BTL mortgage at the higher post-works value, ideally pulling out most or all of the initial cash invested. Verify: does the rental income pass the BTL stress test at the refinanced value? Will the BTL mortgage advance enough to repay the bridge?
Exit 3 — Sale: Buy at auction discount, refurbish, sell at market value. Verify: is there a realistic buyer market at your target sale price? Are costs (bridging, refurbishment, agent fees, SDLT on next purchase) correctly modelled?
🔴 Never assume a refinance will succeed. Get written confirmation from a mortgage broker that a specific lender will lend on the property at your expected after-repair value, before you commit to bridging at auction. A verbal "it should be fine" is not sufficient.
The timeline for arranging bridging finance at auction is tight but manageable if you start early. Work backwards from the completion deadline:
Contact your bridging broker immediately. Provide the lot details, guide price, legal pack, and your financial profile. Request a Decision in Principle.
Review the indicative terms — rate, LTV, fees, term. Confirm these work for your financial model. Do not proceed without running the full cost calculation.
Notify your broker immediately on winning the lot. They submit the full application and instruct the lender's valuer and solicitors on the same day.
Lender's surveyor inspects the property. Lender's solicitors review the legal pack and title. Your solicitor reviews and reports on title simultaneously.
Formal offer received. Both solicitors exchange and complete. Funds drawn down and paid to seller. You are now the registered owner.
Key risk: If the lender's valuation comes in below your purchase price, the LTV changes and the loan amount may reduce. Ensure you have sufficient reserves to cover a potential valuation shortfall before bidding.
Upload your legal pack and LegalPack AI identifies every issue that could prevent refinancing — short lease, unmortgageable condition, title defects, restrictive covenants — so you can verify your exit strategy before committing.
Analyse Legal Pack for Refinanceability →Experienced bridging lenders can typically complete within 7–14 working days once a full application is submitted with all documentation. Approach a bridging broker before the auction with the lot number, legal pack, and your financial information. A Decision in Principle can usually be obtained within 24–48 hours, giving you confidence before bidding.
Typically 0.75–1.5% per month in interest, plus an arrangement fee of 1–2% of the loan amount, and possibly an exit fee of 0.5–1%. On a £150,000 bridge over 6 months at 1%/month, the interest alone is £9,000 plus fees — a total cost of approximately £13,000–£15,000. Always calculate the full bridging cost as part of your maximum bid and profit model using the Max Bid Calculator.
Most bridging lenders offer up to 70–75% LTV on residential property in standard condition. Some specialist lenders will go to 80% for lower-risk properties. For uninhabitable or heavily distressed properties, the LTV may be restricted to 60–65% of current value. The LTV is calculated on current market value or the purchase price (whichever is lower), not the after-repair value.
If your exit fails, bridging becomes extremely expensive. Monthly interest continues to compound, the lender may apply default interest (often double the standard rate), and ultimately they can seek repossession and sell to recover their loan. This is why verifying your exit strategy before committing is critical — not afterwards. Get written confirmation from a mortgage broker that a lender will advance sufficient funds at your expected after-repair value before you bid.
Upload the legal pack and LegalPack AI identifies every issue — short lease, structural flags, title defects, unmortgageable conditions — that could block your refinance exit and strand you in an expensive bridge.
Check Refinanceability Now →No subscription required · Pay per analysis · Results in minutes
Disclaimer: This guide is for general information only and does not constitute financial advice. Bridging finance is a complex product — always obtain advice from an FCA-regulated broker before proceeding. LegalPack AI accepts no liability for financial decisions made based on this content.