Bridging Loans Explained: Costs, Risks, and When They Make Sense

2026-07-06

Bridging loans exist for one reason: speed. When you need to complete a purchase in 14-28 days (auctions, repossessions, time-limited opportunities) and a standard mortgage takes 6-12 weeks, bridging fills the gap. They're short-term, expensive, and powerful — if used correctly.

Used incorrectly, they're one of the fastest ways to lose money in property. This guide covers everything you need to know before using one.

How Bridging Loans Work

A bridging loan is a short-term secured loan (typically 1-18 months) used to "bridge" the gap between buying a property and arranging permanent finance (usually a standard BTL mortgage).

Key characteristics:

• Term: 1-18 months (most common: 6-12 months)
• LTV: up to 75-80% of purchase price (or 65-70% of GDV for refurb)
• Interest: charged monthly (0.55-0.95% per month in 2026)
• Interest payment: monthly (serviced) or rolled up (added to the loan)
• Speed: 7-28 days from application to completion
• Security: the property itself (first charge)

The Cost Structure

Bridging loans have multiple cost components. Missing one in your calculation can turn a profitable deal into a loss.

Monthly Interest

The headline rate. Expressed as a monthly percentage:

:::stats 0.55-0.65% | Best Rates (clean deals, low LTV) 0.65-0.80% | Standard Rates (75% LTV, standard risk) 0.80-0.95% | Higher Risk (unusual property, higher LTV) 1.0%+ | Specialist (complex legal, second charge) :::

On a £150,000 loan at 0.75%/month:

• Monthly interest: £1,125
• 6 months total interest: £6,750
• 12 months total interest: £13,500

Arrangement Fee

Charged upfront or added to the loan. Typically 1-2% of the gross loan.

• £150,000 loan at 2% = £3,000 arrangement fee

Valuation Fee

The lender needs a valuation before advancing funds.

• Standard residential: £300-£500
• Larger/complex property: £500-£1,000

Legal Fees

You pay your own solicitor AND the lender's solicitor.

• Your solicitor: £800-£1,500
• Lender's solicitor: £500-£1,000
• Total legal: £1,300-£2,500

Exit Fee

Some lenders charge an exit fee when you repay. Typically 1% of the loan or a flat fee of £100-£500. Many lenders now offer zero exit fee — check before committing.

Total Cost Example

£150,000 bridging loan held for 6 months at 0.75%/month:

That's £13,650 to borrow £150,000 for 6 months — an effective annualised cost of over 18%. This is why bridging is only viable when the deal generates enough profit or uplift to absorb it.

:::tool bridging-calculator Calculate Your Exact Bridging Costs :::

When Bridging Makes Sense

1. Auction Purchases

Auction completions are typically 28 days. No standard mortgage completes that fast. Bridging is the default funding method for auction buyers.

The play: Buy at auction (20-30% below market value), complete with bridging, then either refurbish and refinance onto a BTL mortgage (BRRR strategy) or sell quickly (flip).

2. Unmortgageable Properties

Properties without a working kitchen, bathroom, or heating system are unmortgageable — standard lenders won't touch them. Bridging lenders will, because they lend against the property's value (or potential value), not its current condition.

The play: Buy the unmortgageable property with bridging, renovate to habitable standard, refinance onto a standard BTL mortgage.

3. Chain Breaks

You've found the perfect investment property but the seller needs a fast completion. Your existing property hasn't sold yet. Bridging allows you to complete immediately and repay when your sale goes through.

4. Speed-Dependent Deals

Probate sales, repossessions, receiver sales, and distressed vendors often require fast completion. The ability to complete in 14-21 days (vs 8-12 weeks for a mortgage) is your competitive advantage against other buyers.

When Bridging Is Dangerous

1. No Clear Exit

A bridging loan without a defined, realistic exit strategy is a ticking time bomb. "I'll figure it out" is not an exit. Before taking bridging, you must know EXACTLY how you'll repay it:

• Refinance onto a BTL mortgage (have you checked affordability?)
• Sale of the property (have you researched comparable values?)
• Sale of another asset (is the timeline certain?)

2. Optimistic Timelines

If your plan requires a 4-month renovation and you take a 6-month bridge, you have 2 months of buffer. Renovations routinely overrun by 2-4 months. Suddenly you're requesting an extension (expensive) or defaulting (catastrophic).

Rule: Add 50% to your expected renovation timeline when choosing your bridging term.

3. Thin Margins

If the deal only works when the refinance valuation hits your exact target AND the renovation comes in on budget AND you complete within 6 months — it's too dependent on perfection. One variable slipping turns profit into loss.

4. Rolled-Up Interest on Long Holds

If interest is "rolled up" (added to the loan rather than paid monthly), the debt grows each month. On a 12-month bridge at 0.75%:

• Month 1: £150,000
• Month 6: £156,900
• Month 12: £164,100

That extra £14,100 must be covered by the exit (refinance or sale proceeds). If your valuation comes in lower than expected, you may not have enough headroom.

Serviced vs Rolled-Up Interest

Serviced (monthly payments): You pay interest each month from your own pocket. The loan balance stays constant. This costs less overall but requires monthly cashflow.

Rolled up: No monthly payments. Interest is added to the loan and repaid at exit. Easier on cashflow during the project but increases the total amount owed. Most refurb bridges use rolled-up interest because the property isn't generating income during renovation.

Retained: The lender deducts the full term's interest upfront and holds it. You receive less on day one but make no further payments. Similar to rolled up but front-loaded.

The Refinance: Exiting the Bridge

The most common exit for investor bridges is refinancing onto a standard BTL mortgage. Key considerations:

The 6-month rule: Many BTL lenders won't refinance until 6 months after purchase. Budget your bridge term accordingly.

Valuation risk: The refinance advance is based on the surveyor's valuation, not your opinion of value. If the surveyor values the property at £180,000 and you expected £200,000, you get £15,000 less (at 75% LTV) — potentially not enough to clear the bridge.

Affordability: The refinance must pass the BTL lender's stress test. If rents don't cover 125-145% of the interest at 5.5%, the refinance won't be approved at the LTV you need.

Run the full bridge → refinance calculation through the Deal Analyser before committing. It shows whether the deal still works after all bridging costs are factored in.

:::tool deal-analyser Model Your Bridge-to-Refinance Deal :::

Choosing a Bridging Lender

Use a broker. The bridging market is not like the high street. Products change daily, lender appetites shift, and the speed of service varies enormously. A specialist bridging broker knows which lenders will complete fastest for your specific deal.

Compare total cost, not just rate. A lender offering 0.65%/month with a 2% arrangement fee and 1% exit fee may cost more than one at 0.75%/month with 1% arrangement and no exit fee. The Bridging Calculator compares total cost across different fee structures.

Check completion speed. If you need to complete in 14 days, not all lenders can deliver. Some take 4-6 weeks even for a "fast" product. Ask your broker specifically about turnaround time.

Understand the extension policy. If your project overruns, what happens? Some lenders extend at the same rate. Others increase the rate significantly. Others start default proceedings. Know this before you sign.

:::tool bridging-calculator Compare Bridging Costs :::

Summary

• Bridging loans are short-term (1-18 months), expensive (0.55-0.95%/month), and fast (7-28 day completion)
• Total cost on a 6-month £150,000 bridge: typically £12,000-£15,000
• Only use bridging when you have a clear, tested exit strategy
• Add 50% to your renovation timeline when choosing the bridge term
• Always model the refinance: will the valuation and rent support the BTL mortgage you need?
• Use a specialist broker — the market is complex and products change daily

Bridging is a tool, not a strategy. The strategy is the deal. Bridging just funds it faster than the alternatives. If the deal works after absorbing the full bridging cost, it's a good use of the tool. If it only works by ignoring the bridging cost, it's not a deal.

This guide is for educational purposes only. Bridging finance carries significant risk including the possibility of repossession if you cannot repay. Always seek professional advice before taking out a bridging loan.