Development finance calculator
Our development finance calculator is designed to help both those new to the industry, and developers who already understand the fundamentals of funding. You can use it as a fast, credible way to validate the structure of the finance you need, before starting an application with the help of our team.
This is not a generic tool — it’s a practical development loan calculator designed to help property developers assess the potential funding structure at an early stage. It is built around how UK lenders actually assess risk, leverage and viability.
As brokers operating daily in the specialist finance market, we know that developers don’t need theory — they need clarity. The calculator allows you to model funding in line with real‑world criteria such as total development cost, gross development value (GDV), loan‑to‑cost (LTC) and loan‑to‑value (LTGDV).
April 2026 development finance rate update
Despite the impact of the conflict in Iran, development finance rates have remained fairly stable. Pricing is not directly impacted by broader economic volatility in the same way mortgage rates are. In fact, there has recently been a reduction in the lowest available development finance rate available in the market.
If you are unsure what interest rate to use in the development calculator, development finance rates currently range from between 0.75% - 1.30% per month.
The outcome of the calculation is for illustrative purposes only, it is not a guarantee.
Ready to discuss a development finance application?
A practical development loan calculator for real‑world use
Our development loan calculator has been designed to reflect how finance is structured in practice. Loan size is typically driven by total development cost and gross development value (GDV), rather than simply the purchase price, and interest is assessed across the full development term.
Using a small number of inputs, the calculator provides an indicative view of:
- Loan size calculated against cost and GDV
- Typical leverage levels seen in the current market
- Estimated interest exposure over the development period
- The level of developer equity usually required
Positioned this way, it functions as a reliable property development finance calculator, supporting early decision‑making, without oversimplifying the funding process.
Suitable for residential and commercial development
The calculator is suitable for a wide range of projects and can be used as both a residential property development loan calculator and a commercial development loan calculator, including:
- Single‑unit and small residential developments
- Multi‑unit residential projects
- Mixed‑use and light commercial projects
Its flexibility allows you to stress‑test different assumptions as a project evolves, helping to identify potential funding constraints early.
Indicative outputs, professional context
This is not a consumer‑style development mortgage calculator, nor is it intended to replace a full funding assessment. Development finance remains highly project‑specific, with final terms dependent on factors such as planning status, valuation, build complexity, exit strategy and your experience.
However, as a development finance loan calculator, it provides a commercially credible benchmark — one that reflects lender logic rather than optimistic projections.
Newer developers can gain clarity on how development funding is structured, while more experienced developers can use it to validate assumptions and prioritise opportunities. It is intended to support informed discussions with our broker team, rather than produce automatic lending decisions.
From calculator to funding structure
Once you’ve used the calculator, completed your planning and are ready to secure funding tailored precisely to your project, our advising team are here to help.
Call our Freephone number to get through to an advisor for an immediate consultation during office hours.
Once we have a full understanding of the project and your circumstances we will get to work on finding you a cost effective borrowing solution.
Looking for something different? Check our resources.
We specialise in helping developers get the very best development finance rates from a wide range of lenders in the marketplace.
