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Bridging finance explained for property investors

Bridging finance is short-term, secured borrowing used to move fast or to buy something a normal mortgage will not touch. Investors use it to buy at auction, to fund a property too derelict to mortgage, or to bridge the gap between buying and refinancing in a BRRR. It is fast and flexible, and it is expensive, so it only makes sense when the speed or the access it buys you is worth the cost.

This guide covers how it works, what it really costs, and when to reach for it.

How bridging works

A bridge is a loan secured against property, usually for 1 to 18 months, with a defined exit: the way you will repay it. The two common exits are refinancing onto a normal mortgage once the property is improved and lettable, or selling the property. Lenders care more about the strength and credibility of that exit than almost anything else, because that is how they get paid back.

Interest is charged monthly, not annually, which is the first thing that catches people out. It is often "rolled up", meaning you do not pay it month to month but it accrues and is settled when the loan is repaid. That keeps your monthly outgoings low during the works but means the debt grows the longer you hold it.

What it actually costs

Pricing is quoted as a monthly rate. As of 2026, mainstream bridging deals price roughly between 0.65 and 0.95 percent a month, with the whole market spanning about 0.55 percent for prime, low loan-to-value cases up to 1.5 percent for higher-risk ones. A rate of 0.75 percent a month is roughly 9 percent a year, so a bridge held for six months at that rate costs about 4.5 percent of the loan in interest alone.

But the rate is only part of it. Budget for:

  • An arrangement fee, commonly around 2 percent of the loan.
  • A valuation fee.
  • Legal fees, often for both your side and the lender's.
  • Sometimes an exit fee.

Adding up the true cost

Add it up and a six-month bridge can easily cost 6 to 8 percent of the amount borrowed once fees are included. That is the number to weigh against the profit the deal makes, not the headline monthly rate.

When to use it, and when not to

Bridging earns its cost when:

  • You are buying at auction and must complete in 28 days.
  • The property is unmortgageable in its current state, for example no working kitchen or bathroom, and you intend to refurbish then refinance.
  • A below-value deal will not wait for a slow mortgage and the discount you secure is bigger than the cost of the bridge.

When bridging is the wrong tool

It is the wrong tool when you do not have a clear, realistic exit. A bridge with no firm refinance or sale lined up is how investors get caught paying rolled-up interest on a property they cannot offload. If a standard mortgage will do the job in time, it is far cheaper.

Worked example

You buy an unmortgageable property at auction for 150,000 pounds using a bridge, intending to refurbish and refinance in six months.

  • Loan: 150,000 (assume funded in full for simplicity)
  • Interest at 0.75 percent a month for 6 months, rolled up: about 6,750
  • Arrangement fee at 2 percent: 3,000
  • Valuation and legals: say 2,500
  • Total cost of the bridge: about 12,250 over six months

Worked example: is the bridge worth it

That 12,250 is a real line in the deal. If the discount you got by buying fast and the value you add by refurbishing comfortably exceed it, the bridge paid for itself. If the deal only just works on a normal mortgage, the bridge cost can wipe out the profit. Always model the finance cost explicitly before committing.

How PropDetect helps

PropDetect models the bridge for you as one of its strategies, including the rolled-up interest, the arrangement and exit fees, and the refinance that repays it, so you see the true cost of bridging inside the deal rather than guessing from a monthly rate. It sits alongside the cash and buy-to-let views, so you can compare financing approaches on the same property and pick the one that actually maximises return.

Frequently asked questions

How much does bridging finance cost?

It is quoted monthly. In 2026 mainstream rates are roughly 0.65 to 0.95 percent a month, with the wider market from about 0.55 up to 1.5 percent. On top of interest, expect an arrangement fee around 2 percent, plus valuation and legal fees.

Is bridging interest monthly or annual?

Monthly. A rate of 0.75 percent a month is about 9 percent a year. It is often rolled up and settled when the loan is repaid, so the longer you hold it the more it costs.

What is an exit in bridging?

It is how you repay the loan, usually refinancing onto a mortgage or selling the property. Lenders assess the strength of the exit closely, because a weak or missing exit is the main risk.

When should an investor use bridging?

When speed or access matters more than cost: auction purchases, unmortgageable properties you will refurbish then refinance, or below-value deals that will not wait. If a normal mortgage works in time, use that instead.

Is bridging cheaper than a mortgage?

No. Buy-to-let mortgage rates in 2026 are around 5 to 5.75 percent a year, far below bridging once you annualise the monthly rate and add fees. Bridging buys speed and access, not a low cost of money.

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