Last reviewed: June 2026
TL;DR- Development finance is short-term lending for property construction or conversion, repaid by sale or refinancing onto a standard mortgage at practical completion.
- Lenders assess loans against the Gross Development Value (GDV) - the estimated value of the completed development - typically lending up to 65-70% of GDV.
- Funds are released in stages as construction progresses, monitored by a lender-appointed monitoring surveyor.
- Development finance is significantly more expensive than standard mortgages - it is a short-term tool, not a permanent finance solution.
What Is Development Finance?
Development finance is a short-term loan used to fund the construction of new properties or the conversion of existing buildings into a different use (for example, converting a commercial building into residential flats). It differs from a standard mortgage in that: the security is a property under construction rather than a completed habitable building; funds are released in stages rather than in full at the outset; and the loan is repaid at practical completion from the sale proceeds of the completed units or by refinancing onto a standard mortgage.
Development finance is an unregulated commercial lending product. FCA residential mortgage conduct rules do not apply.
GDV and How Lenders Assess It
Gross Development Value (GDV) is the estimated aggregate market value of all the units in a development when completed and sold. Lenders use GDV as the primary reference point for development finance lending:
- Maximum loan as a percentage of GDV: typically 60-70% of GDV. If the GDV is £1,000,000, the maximum loan is £600,000-£700,000.
- Loan to cost (LTC): some lenders also assess the loan as a percentage of total development costs (land, build costs, professional fees, finance costs). Maximum LTC is typically 80-90%.
- Day one land advance: the initial advance to fund the land purchase, typically assessed at 65-70% of land value.
- Build cost facility: the remaining facility drawn down in stages as construction progresses.
GDV is assessed by a RICS valuer instructed by the lender. The lender typically takes a conservative view of the GDV, and the developer should expect the lender's valuer to assess at a lower level than the developer's own estimate.
Monitoring Surveyors
Lenders appoint a monitoring surveyor (also called a project monitor) to oversee the development on behalf of the lender. The monitoring surveyor approves draw requests from the developer, inspects work completed at each stage, certifies that works have been executed in accordance with the approved drawings and specification, and alerts the lender to cost overruns, programme delays or quality issues. The cost of the monitoring surveyor is typically charged to the developer.
Exit Strategies
Development finance lenders require a clear exit strategy at the outset: how the loan will be repaid. Common exits include: sale of completed units on the open market; refinancing onto a standard buy-to-let mortgage (for residential investment properties); and refinancing onto a commercial mortgage (for commercial developments). The credibility of the exit strategy is a key part of the lending assessment.
Frequently Asked Questions
What experience do lenders require for development finance?
Most development finance lenders require the borrower (or their project team) to have prior experience of delivering comparable developments. A first-time developer seeking to build a 20-unit residential scheme will face significant challenges in accessing standard development finance. Some lenders have specific first-time developer products with stricter criteria, lower GDV percentages and additional monitoring requirements. Joint ventures with experienced developers are one route for first-time developers to access development finance.
What is the typical interest rate on development finance?
Development finance interest rates are quoted as monthly rates (similar to bridging loans), typically ranging from 0.5% to 1.5% per month depending on the LTV, GDV percentage, scheme complexity and borrower experience. Interest is typically rolled up during the construction period and repaid at exit. Arrangement fees of 1-2% of the loan are standard, plus valuation, monitoring surveyor and legal costs.
Can development finance be used for a single residential property?
Yes. Development finance is not limited to large multi-unit schemes. Single residential property development - building one new home or converting one property - can be financed using development finance. Smaller loan sizes may limit lender choice, as some development finance lenders have minimum loan thresholds. Self build mortgages are an alternative for individuals building a single home for their own occupation.
What happens if the development overruns the loan term?
If the development takes longer than the loan term, the borrower must apply for an extension. Lenders typically grant extensions where the project is progressing and the exit remains viable, but additional fees apply and the interest continues to accrue. Significant overruns can materially erode the project profit margin and may require additional equity from the developer.
