Bridging finance is a short-term loan, secured against property, designed to be repaid within months rather than years — typically 6 to 18 months. It exists to fund situations a standard mortgage can't: buying a property in poor condition that no mainstream lender will touch, completing an auction purchase in 28 days, or covering the gap between selling one property and completing on the next. This guide explains how bridging actually works, what it genuinely costs once every fee is included, and how to use it without getting caught out by the single thing that causes almost every bridging horror story — not having a clear, realistic exit.
1. What bridging finance is
A bridging loan is secured against property, like a mortgage, but assessed and priced completely differently. Where a mortgage lender wants years of stable income evidence and a property in lettable, mortgageable condition, a bridging lender is principally concerned with two things: the security (is the property worth enough to cover the loan if everything goes wrong) and the exit (how, specifically, will this loan be repaid, and by when). Affordability in the conventional sense — your income covering monthly payments — barely features, because most bridging loans don't require monthly payments at all; interest is typically rolled up and paid in full at the end, alongside the capital.
This is what makes bridging both useful and risky. Useful, because it can fund deals a mortgage simply cannot — an auction purchase needing completion in 28 days, a derelict property with no kitchen or bathroom, a chain-break where you need to complete on a purchase before your own sale has gone through. Risky, because the cost accrues whether or not your plan goes smoothly, and a bridging loan with no clear, realistic exit is a countdown clock, not a flexible tool.
2. When to use it
Unmortgageable properties (no kitchen, no bathroom, structural issues) can't be bought with a standard BTL mortgage. Bridge to purchase and refurbish, then refinance onto a BTL mortgage once the property is lettable.
Auction contracts are unconditional and typically require completion within 28 days — far faster than a standard mortgage application can complete. Bridging funds the purchase; refinancing onto a mortgage happens afterwards.
If your onward purchase needs to complete before your own sale does, a bridge covers the gap — repaid from the sale proceeds once that completes.
Since there's no rental income to offset holding costs during a flip, bridging is often used for the purchase and refurbishment, repaid from the eventual sale proceeds.
3. The real cost structure
The headline monthly rate is only one part of what a bridge actually costs. A full picture includes the rate, the arrangement fee, the exit fee (not always charged, but common), and the valuation and legal costs — all of which need to be modelled before you can judge whether a deal genuinely works.
| Cost component | Typical range | Example on £100,000, 6 months |
|---|---|---|
| Monthly interest rate | 0.7%–0.9% per month | £4,200–£5,400 total |
| Arrangement fee | 1.5%–2% of loan | £1,500–£2,000 |
| Exit fee (if charged) | 0%–1% of loan | £0–£1,000 |
| Valuation fee | £300–£800 | £300–£800 |
| Legal fees (your side + lender's side) | £1,000–£2,000 | £1,000–£2,000 |
| Realistic total cost | — | £7,000–£11,200 |
The monthly rate convention (0.7–0.9% per month) is worth internalising, since bridging is priced and discussed in monthly terms rather than the annual percentage rate used for mortgages — a 0.85%/month rate is roughly 10.2% annualised, which sounds dramatically more expensive stated that way, even though it's the same cost. This isn't a reason to avoid bridging where it's the right tool, but it is why bridging should be treated as a short-term, purpose-specific cost to be minimised in duration, not a financing strategy to hold for longer than strictly necessary.
Because bridging interest accrues monthly, the single biggest cost control available to you is speed — a 4-month bridge costs meaningfully less than a 6-month one on the same loan, all else equal. Build a realistic renovation or sale timeline before taking out the bridge, then treat any slippage against that timeline as a cost event to actively manage, not something to discover only when the bridge term is already running out.
4. Open vs closed bridges
Most bridging used for BRRR and flip strategies on Poqet starts as open (since the refinance or sale isn't agreed at the point of purchase) and effectively becomes closed once a mortgage offer or sale is agreed partway through the term. Lenders price for the open period, so getting your exit confirmed as early as realistically possible — applying for the refinance mortgage well before the bridge term ends, not after — can reduce the effective cost.
5. First charge vs second charge
A first charge bridge means the bridging lender has the primary legal claim against the property — used when there's no existing mortgage, typically because you're buying with the bridge or have paid off any prior mortgage. A second charge bridge sits behind an existing mortgage already on the property, used when you want to raise additional short-term finance without disturbing a mortgage you don't want to (or can't easily) replace. Second charge bridging is generally more expensive and more restrictive on LTV than first charge, since the second-charge lender's security is subordinate to the first mortgage if anything goes wrong.
6. The exit strategy — why it's everything
Every bridging lender's underwriting decision centres on one question: how, specifically, will this loan be repaid? A vague answer — "I'll probably sell it" or "I'll remortgage at some point" — gets a worse rate, a shorter term, or a decline outright. A specific, evidenced answer — a mortgage broker's confirmation that refinancing is achievable at the projected post-works value, or an agreed sale with a realistic completion timeline — gets better terms and a smoother process.
The exit needs to be realistic, not just plausible. For a BRRR exit specifically, that means having genuine confidence in both the post-works valuation (based on real comparable sold prices, not aspirational pricing) and the rental income the refinance lender will assess against — both covered in detail in the BRRR Strategy Guide. For a flip exit, it means a realistic sale price based on actual local comparables and a sale timeline that accounts for the genuine pace of the local market, not the fastest case you can imagine.
7. Getting a bridging loan — the process
Know specifically how and when the loan will be repaid. This shapes every other decision and is the first thing any lender or broker will ask.
The bridging lender market is fragmented and less standardised than mainstream mortgages — a broker with genuine bridging experience can access better terms and a wider lender panel than going direct to one lender.
The lender values the property as it currently stands (not the post-works value) to determine how much they'll lend against it today.
Both your solicitor and the lender's solicitor need to complete the legal process — bridging completions can be fast (days, for a straightforward case) but complex titles or auction purchases still need proper legal due diligence.
Funds release and interest begins accruing from this point — track your term end date from day one, not as an afterthought a few months in.
8. Risks
If renovation runs over schedule, or a sale falls through, or a refinance mortgage takes longer to arrange than planned, the bridge term can expire before the exit is ready. Some lenders will extend — but typically at a higher rate and with additional fees, since you're now a worse credit risk than at the start. Others won't extend at all and will require immediate repayment, which can force a forced sale at a discount or require emergency alternative finance arranged at short notice and on poor terms. Always negotiate term length with a realistic buffer beyond your expected timeline, not the minimum you hope to need.
Beyond the term-exceeded scenario, the other significant risk is the exit itself underperforming — a post-works valuation that comes in below projection (reducing refinance proceeds and potentially leaving you unable to fully repay the bridge), or a sale price below expectation in a flip. Both of these are ultimately valuation and market-research risks rather than bridging-specific risks, but bridging is where they bite hardest, since the bridge has to be repaid regardless of whether the underlying deal performed as hoped.
9. Common mistakes
A tight term with no buffer turns any delay into a crisis. A slightly longer term costs more in total interest if unused, but is far cheaper than an emergency extension or forced exit.
Refinance mortgages take weeks to arrange even when straightforward. Start the application well before the bridge term ends, not when it's already running out.
Quoting only the monthly rate and ignoring arrangement fees, exit fees, valuation, and legal costs understates the true cost of the bridge by a meaningful margin.
It's neither cheap nor designed for the long term. Used for its intended purpose — a short, specific gap with a clear exit — it's an effective tool. Held for longer than necessary, the cost compounds quickly.
10. Frequently asked questions
How quickly can a bridging loan complete?
Straightforward cases can complete in as little as a few days to two weeks, which is why bridging is the standard tool for auction purchases requiring completion within 28 days. More complex cases — unusual property types, complicated titles, or larger loans — take longer, so always confirm a realistic timeline with your broker for your specific deal rather than assuming the fastest case applies.
Can I get bridging finance through a limited company?
Yes — bridging finance is widely available to limited company SPVs, and for BRRR specifically, many investors purchase, refurbish, and refinance entirely within a company structure for the same tax reasons covered in the SPV vs personal ownership guide. Confirm with your broker that the specific lender you're considering lends to companies, since not every bridging lender does.
What happens if I can't repay the bridge on time?
Contact the lender as early as possible, ideally before the term ends rather than after — many lenders will consider an extension if approached proactively with a credible updated plan, though typically at a higher rate. Lenders who won't extend may require immediate repayment, which can mean a forced sale, often at a discount, or scrambling for emergency alternative finance on poor terms. This is precisely why building a realistic timeline buffer into the original term matters so much.
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