Development Bridging Loans for Property Projects

A development bridging loan is a short-term secured loan designed to fund property development projects, covering everything from initial site acquisition through construction and on to a planned exit. Unlike a standard bridging loan, which typically finances the purchase or refinance of an existing property in its current condition, a development bridging loan is structured around the increased value a project will create once building work is complete.

These loans are most commonly used for smaller-scale developments: converting a single house into flats, building a small number of new-build units, or carrying out heavy structural refurbishment that a standard bridging lender would not support. Loan terms typically range from 6 to 24 months, with funds released in stages as the build progresses rather than as a single lump sum on day one.

Development bridging sits between standard bridging loans and full-scale development finance. Traditional development finance suits larger schemes, typically 10 or more units, and involves detailed cost schedules, professional quantity surveyor sign-off, and longer timescales. Development bridging is faster to arrange, usually with fewer conditions, making it better suited to projects where speed or simplicity matters more than borrowing the absolute maximum. It is a popular choice among experienced landlords, small-scale developers, and investors looking to add value through refurbishment or conversion.

Regulated vs unregulated development bridging

Most development bridging loans are unregulated because they are secured against non-owner-occupied property. If any part of the security is or will be your main residence, the loan falls under FCA regulation, which changes the lender panel and application process. This is a product classification rather than a reflection of quality or safety. For a full explanation of this distinction, see our bridging loans guide.

Development bridging loans work differently from standard bridging in several important ways. Understanding these mechanics will help you compare lender offers accurately and avoid unexpected costs during your project.

Loan-to-cost (LTC) vs loan-to-GDV lending

Lenders assess development bridging loans using three key metrics. Loan-to-value (LTV) measures the loan against the current market value of the property or site. Loan-to-cost (LTC) measures the loan against total project costs, including purchase price, build costs, and professional fees. Loan-to-gross development value (LTGDV) measures the loan against the projected end value once the development is complete.

Most development bridging lenders cap borrowing at 70% to 75% of GDV, or up to 85% of total project costs, whichever is lower. The GDV cap is almost always the binding constraint on smaller projects, so obtaining a realistic end-value appraisal before applying is essential for understanding how much you can actually borrow.

Staged drawdowns and monitoring surveyors

Rather than releasing the full loan amount on completion, development bridging lenders release funds in stages tied to construction milestones. A monitoring surveyor, appointed and paid for by the borrower but acting on behalf of the lender, visits the site at each stage to confirm the work has been completed to the required standard before the next tranche is released. This protects the lender but also means you need working capital or a contingency fund to cover costs between drawdowns. Typical inspection intervals are every four to six weeks during active building work.

Roll-up vs serviced interest

Most borrowers choose to roll up interest, meaning it accrues monthly and is added to the loan balance, then repaid in full when the loan is redeemed. This avoids monthly payments during the build, but the interest compounds, so the total cost increases the longer the loan runs. Some lenders offer serviced interest, where you make monthly payments throughout the term. Serviced interest is cheaper overall but requires reliable cash flow during the project, which many developers do not have while funds are tied up in the build. For more on how interest structures work across bridging products, see our guide to regulated bridging loans.

Development bridging loans are flexible and can fund a wide range of property projects. The most common use cases include the following.

Site acquisition ahead of planning permission

Buying land or property before planning consent is granted allows you to secure the site at a lower price while you apply for permission. Many development bridging lenders will lend on sites without planning, although LTV ratios will typically be lower to reflect the additional risk involved.

Funding construction and heavy refurbishment

Development bridging can cover the full cost of building work, from structural conversions and change-of-use projects to ground-up new builds on a small scale. This includes projects that standard bridging lenders would decline due to the extent of works involved, such as adding storeys, subdividing properties, or converting commercial premises to residential use.

Bridging between development finance and long-term exit

If your main development finance facility is expiring before units are sold or let, a short-term development bridging loan can bridge the gap and prevent a default on the original facility. This is sometimes referred to as exit finance or mezzanine bridging and is increasingly common on projects where the sales period runs longer than expected.

Auction purchases with development potential

Auction buyers who need to complete within 28 days often use development bridging to secure a property quickly, with build costs drawn down in stages after the initial purchase completes. This is particularly common for properties bought below market value that need significant work. If your project is a straightforward residential purchase or light refurbishment rather than a full development, a residential bridging loan may be more cost-effective.

The cost of a development bridging loan depends on the loan size, the LTGDV ratio, your experience as a developer, and the complexity of the project. All figures below are indicative ranges that will vary between lenders and over time.

Loan sizes and maximum borrowing

Most specialist lenders offer development bridging loans from around £150,000 up to £5 million, although some will consider larger schemes on a case-by-case basis. Maximum borrowing is typically capped at 70% to 75% of the gross development value (GDV), or 80% to 85% of total project costs. The lower of these two figures determines your maximum facility.

Worked example

Consider a small development with a GDV of £500,000. You purchase the site for £200,000 and estimate build costs of £150,000, giving total project costs of £350,000. A lender offering 75% LTGDV would provide up to £375,000, while 85% LTC would allow up to £297,500. The binding constraint here is the LTC figure, so your maximum facility would be around £297,500, meaning you need to contribute roughly £52,500 of your own funds to the project.

At an interest rate of 0.85% per month, rolled up over a 12-month term, total interest on the full facility would be approximately £30,345. Add a 2% arrangement fee of £5,950, monitoring surveyor costs of around £3,000 to £5,000, and legal fees of £2,000 to £4,000, and the total cost of finance for this project sits at roughly £41,000 to £45,000.

Interest rates

Development bridging rates typically range from 0.65% to 1.25% per month, depending on the LTGDV ratio, the developer's track record, and scheme complexity. Rates at the lower end are usually reserved for experienced developers with strong exit strategies and lower leverage.

Fees

Expect to pay an arrangement fee of 1% to 2% of the gross loan, a broker fee if you use an intermediary, monitoring surveyor fees of £300 to £750 per site visit, a valuation fee, and legal fees for both your own and the lender's solicitors. Some lenders also charge an exit fee of 1% to 1.5%, although this is increasingly being waived in a competitive market. For current rate comparisons, see our bridging loan rates page. You can also model your own project figures using our bridging loan calculator.

Choosing between development bridging and traditional development finance depends on the scale, timeline, and complexity of your project. Both products fund property development, but they differ significantly in speed, cost structure, and eligibility requirements.

The main advantage of development bridging is speed: most lenders can complete within 2 to 4 weeks, compared with 6 to 12 weeks for traditional development finance. Development bridging also tends to have simpler documentation requirements and more flexible eligibility criteria, making it accessible to first-time developers or those with a limited track record.

However, traditional development finance is usually cheaper for larger, longer projects. Interest rates on development finance typically range from 0.5% to 0.9% per month, compared with 0.65% to 1.25% for development bridging. Development finance facilities can also run for 18 to 36 months, giving more time for both the build phase and the subsequent sales or letting period.

Eligibility and experience

Traditional development finance lenders usually require evidence of at least two to three completed projects of a similar scale before they will lend. Development bridging lenders are generally more flexible on experience, with some willing to consider first-time developers where the project is straightforward and the exit strategy is credible. Adverse credit is not always a barrier to development bridging, although you should expect higher rates and lower leverage if you have recent county court judgments, defaults, or missed mortgage payments on your record.

Application process

Applying for a development bridging loan is faster than applying for traditional development finance, but you will still need to provide detailed information about your project. Most lenders require a completed application form, proof of identity and address, details of the property or site being purchased, a schedule of works with itemised build costs, a project timeline with key milestones, evidence of your exit strategy such as a mortgage agreement in principle or estate agent appraisal, and proof of your development experience where applicable.

From initial enquiry to the first drawdown of funds, the typical timeline is 2 to 4 weeks. Some lenders can complete in as little as 7 to 10 working days for straightforward cases with clean title and a strong application. The monitoring surveyor will carry out an initial site inspection before the first drawdown, with subsequent inspections at each agreed build stage.

Risks to consider

Development bridging loans carry specific risks that you should fully understand before proceeding. Cost overruns are common in property development, and if your build costs exceed the original estimate, you may need additional funding that your lender is not obliged to provide. Rolled-up interest compounds monthly, so any delay to your project directly increases the total cost of finance. If your exit strategy fails, for example if completed units do not sell or let within the loan term, you face the risk of default rates being applied. These penalty rates can be significantly higher than the standard rate. In the worst case, the lender has the right to repossess and sell the secured property to recover the outstanding debt.

Important: a development bridging loan is a form of secured lending. Your property is at risk if you do not repay the loan by the agreed date. The costs of borrowing can be substantial, particularly where a project overruns or the exit strategy does not proceed as planned. We strongly recommend that you seek independent financial and legal advice before committing to any development bridging facility. If your exit strategy involves refinancing onto a residential or buy-to-let mortgage, see our mortgages guide to understand your options.