A discounted property with a short completion deadline can look like an exceptional opportunity – until the funding costs are added to the appraisal. Bridging finance costs are not simply a monthly interest rate. They are the combined cost of securing, using and repaying short-term finance, and they need to be built into your deal before you commit.
For investors, developers and landlords, bridging can provide the speed and flexibility a conventional mortgage cannot. It can fund an auction purchase, a heavy refurbishment, a non-mortgageable property or a chain-breaking acquisition. But the right facility is one that supports your profit and exit strategy, not merely one that gets the purchase over the line.
What makes up bridging finance costs?
The total cost of a bridge usually includes interest, lender fees, valuation and legal costs, and potentially broker fees. The amount you pay depends on the loan size, term, loan-to-value, security property, borrower profile, property condition and strength of your proposed exit.
A lender may quote an attractive monthly interest rate, but that figure alone does not tell you what the facility will cost. Two loans with the same rate can have very different total costs if one has a larger arrangement fee, retained interest or more expensive legal requirements.
The most useful question is not, “What is the rate?” It is, “What will I receive on day one, what will I repay at exit, and does the project still work after every cost?”
Interest: serviced, retained or rolled up
Bridging interest is generally charged monthly and is often quoted as a monthly percentage rather than an annual mortgage rate. How it is paid has a material effect on cash flow.
With serviced interest, you make monthly payments during the term. This can reduce the balance due at redemption, but it requires proven income or sufficient monthly liquidity. It may suit a landlord with strong rental income or an investor whose capital is better deployed elsewhere.
Retained interest is deducted from the loan at completion to cover a defined number of months. For example, on a 12-month facility, the lender may retain the full projected interest upfront. You do not make monthly payments, but the net amount released to you is lower than the gross facility amount. This matters when calculating how much cash is actually available for the purchase and works.
Rolled-up interest is added to the loan balance each month and paid when the bridge is redeemed. This can be useful for projects with no immediate income, but the balance grows over time. The facility must have enough headroom for the expected interest, and the exit needs to repay the increased balance.
The right structure depends on your cash position, project timetable and lender criteria. There is no universal best option.
Arrangement, exit and other lender fees
An arrangement fee is commonly charged as a percentage of the gross loan. It is usually deducted on completion or, less commonly, paid separately. A 2% arrangement fee on a £500,000 loan is £10,000, so even a small difference in percentage terms deserves attention.
Some facilities also include an exit fee. This may be calculated as a percentage of the loan, a percentage of the gross development value or a fixed amount. Exit fees are not present on every bridge, but where they apply they can significantly affect the final repayment figure. They should be clear in the initial illustration, not discovered late in the process.
Other potential lender charges include drawdown fees, extension fees, asset manager fees and fees for amendments to the facility. Development and refurbishment-led finance can carry additional monitoring costs, particularly where funds are released in stages against completed works.
The costs beyond the lender’s quote
Lender charges are only one side of the equation. Property finance carries third-party costs that need to be allowed for in your appraisal from the outset.
A valuation is normally required by the lender, and the borrower usually pays for it. The cost will vary with property type, value and complexity. A mixed-use building, a large commercial asset or a development site may require a more detailed report than a straightforward residential investment.
You will also normally be responsible for your own legal fees and the lender’s legal fees. Where the security is complex – for example, a title issue, multiple units, a company purchase, a short lease or planning considerations – legal work can be more involved. Speed matters in bridging, but rushing past legal complexities can be expensive later.
Broker fees should be discussed openly as part of the overall cost. A specialist broker can add value by sourcing lenders that understand the asset and structuring a facility around the intended exit. The key is transparency: include the fee in the figures and assess the deal on its total commercial outcome.
How loan-to-value affects the price
Loan-to-value, or LTV, is a major driver of bridging pricing. In broad terms, lower leverage gives the lender more security and can lead to better rates and terms. Higher leverage can preserve more of your own cash for refurbishments or future acquisitions, but it will often come with higher interest costs, tighter criteria or a lower net advance once fees and retained interest are deducted.
This creates a real trade-off. Borrowing the maximum available may look attractive because it reduces your upfront contribution. Yet if the higher-cost facility erodes the margin, introduces a difficult valuation hurdle or leaves insufficient contingency, it may not be the most profitable route.
For refurbishment projects, lenders may assess the current value, purchase price, gross development value or a combination of these. Understanding which basis applies is essential. A high headline LTV against end value does not always mean the lender will fund a high proportion of the purchase and works costs on day one.
Your exit strategy is part of the cost calculation
A bridge is short-term finance, so the exit strategy is central to both lender confidence and cost control. Typical exits include sale of the property, refinance onto a buy-to-let or commercial mortgage, repayment from another asset sale, or repayment following development completion.
If you intend to refinance, stress-test the exit against realistic rental income, valuation assumptions and the likely criteria of the long-term lender. A property bought below market value and refurbished to a good standard may refinance well, but the valuation must support it and the works must be complete to the required standard.
If the plan is to sell, allow for marketing time, conveyancing delays and the possibility that the achieved price is below your target. A bridge that is cheap for six months can become expensive if a sale takes ten. Extensions are not guaranteed, and they are rarely free.
Build a time contingency into the original calculation. A credible deal should survive a delayed refinance, a slower sale or a modest increase in works costs without relying on a best-case outcome.
A simple way to assess the real cost
Before offering on a property, create a full sources-and-uses schedule. Your uses should include purchase price, Stamp Duty Land Tax where applicable, refurbishment budget, professional fees, finance fees, interest, legal costs, valuation, insurance, contingency and selling or refinance costs. Your sources should show your deposit, bridge net advance and any other available capital.
Then calculate the projected repayment at more than one point in time. Model the expected exit date, then test one or two later dates. If the bridge is retained-interest or rolled-up-interest, make sure you understand whether the quoted facility covers the full term and what happens if the project overruns.
For a flip, assess the expected sale proceeds after estate agency and legal costs, then deduct the full finance repayment and every project expense. For a BRRRR project, compare the anticipated refinance proceeds with the bridge redemption figure and establish how much capital will remain in the deal. The calculation should expose the margin, not flatter it.
Choosing a bridge that protects your margin
The cheapest monthly rate is not automatically the cheapest or most suitable bridge. A lender offering a slightly higher rate may provide a better net advance, fund works in a practical way, accept the property condition or offer terms that make your exit more achievable. Conversely, a low-rate offer with restrictive conditions can cost more through delays, additional capital requirements or a failed refinance.
The strongest approach is to assess finance alongside the property strategy. Consider the acquisition price, scope of works, likely end value, available cash, required completion date and exit route as one commercial decision. A specialist adviser can help compare the full cost of competing options and identify terms that may affect profit long before completion.
A bridge should give you the time and capital to create value, not force you into a pressured exit. Price the facility conservatively, keep contingency in reserve and make sure the numbers work before the opportunity becomes urgent.
