Development finance calculator UK — estimate project costs and source lenders
Coming soon

Development Finance Calculator

Estimate development costs, source live lender products and apply online.

Try live BTL calculator
Coming soonGround-up & conversionLTGDV & LTC
Development finance calculator UK Live lender-uploaded products Senior & mezzanine options Specialist brokerage support Free to calculate & source

Fund a ground-up build, a conversion or a heavy refurbishment with finance that releases in stages as the project progresses. Use the calculator to estimate your costs, then source the lenders who back property development.

Products are uploaded directly by lenders, so you're sourcing live, current development deals. Once you've run your figures, shortlist what fits and apply online. Your application is then handled by Dynamic Commercial Finance, our specialist brokerage team, who fact-find your case and submit it to the lender.

What is development finance?

Development finance is short-to-medium-term funding for building or substantially converting property. Unlike a standard mortgage, it's released in stages (drawdowns) as the build hits agreed milestones, with a lender's monitoring surveyor signing off progress. It's sized against the end value of the finished scheme, not just the current site value.

Two metrics drive the deal:

LTGDV (Loan to Gross Development Value)

The loan as a percentage of the projected finished value.

LTC (Loan to Cost)

The loan as a percentage of total project cost (land + build).

Structures include senior debt (the main facility), stretched senior (higher leverage), and mezzanine (a top-up layer above senior debt to reduce the developer's cash input). Interest is typically rolled up and repaid on exit — usually the sale of the completed units or a refinance onto a term/BTL mortgage.

How the calculator works

Enter your land cost, build cost, projected end value (GDV), rate and term, and the calculator estimates your interest and total funding cost, along with an indication of LTGDV and LTC. Model different leverage levels to see how much cash you'd need to put in.

The result is a guide, not a formal quote. Development lending is bespoke and experience-led — the live products you source reflect real lender appetite.

Development filters — real lender criteria

Every filter maps to how development lenders underwrite schemes and exits.

Land cost & GDV
Build cost / LTC
LTGDV
Planning status
Developer experience
Senior / mezzanine
Drawdown schedule
Monitoring surveyor
Exit (sale / refinance)
Scheme type
Term (months)
Site location

Explore related tools: bridging, commercial, buy-to-let.

From calculation to completed application — one platform

Estimate

Model your costs with the calculator above.

Source

Browse development finance products uploaded directly by lenders.

Shortlist

Save the deals that fit, with no obligation to proceed.

Apply online

Submit through the platform when ready.

We handle the rest

Dynamic Commercial Finance fact-finds and submits your case to the lender.

Development finance rates and criteria in 2026

With the base rate at 3.75%, indicative 2026 pricing for senior development finance:

  • Challenger-bank senior debt — typically 7.5% to 10% all-in for senior loans up to around 65–70% LTGDV, with several lenders back in the 70% bracket.
  • Specialist / non-bank lenders — typically 8.5% to 11.5% all-in for higher-leverage or non-vanilla schemes, and more flexible on track record and site type.
  • Mezzanine — priced above senior, used to stretch leverage and reduce cash input.

For site acquisition before development finance drawdown, developers often use bridging — around 0.7%–1.1%/month at 65–75% LTV for vanilla deals, higher (0.95%–1.25%/month) for pre-planning purchases.

Lenders assess your experience, the scheme's viability, planning status, build costs and exit. Beyond the rate, expect arrangement and exit fees plus monitoring surveyor costs.

Indicative rate ranges only — August 2026. Live lender-uploaded products are the source of truth.

Why use DyneSourcer for development finance?

Products uploaded by lenders

Live senior, stretched-senior and mezzanine options.

Calculate, source, shortlist and apply in one place

The full journey for development finance — not just a cost estimate.

Specialist brokerage support

Dynamic Commercial Finance packages your appraisal, cost schedule, planning and exit, which is what development lenders underwrite on.

Whole-of-market view

Challenger banks and specialist development lenders together.

Development finance FAQs

Common questions about drawdowns, LTGDV, LTC, mezzanine and developer experience.

How is development finance released?

In stages (drawdowns) as the build reaches agreed milestones, signed off by the lender's monitoring surveyor — not as a single lump sum.

What happens after I apply?

Your application goes to Dynamic Commercial Finance, our specialist brokerage team, who fact-find your case and submit it to the lender.

What's the difference between LTGDV and LTC?

LTGDV is the loan against the finished value of the scheme; LTC is the loan against total project cost (land plus build). Lenders use both to size and cap the facility.

What is mezzanine finance?

A top-up layer that sits above senior debt to increase leverage and reduce the cash a developer puts in, priced higher than senior because it carries more risk.

Do I need development experience?

It helps and improves pricing, but specialist lenders consider less-experienced developers, particularly on smaller or lower-risk schemes. The brokerage can help place first-time developer cases.

Calculate, source and apply — all in one place.

Model your development costs, source live products from UK lenders, shortlist and apply online. Dynamic Commercial Finance handles the rest.

Development blogs

Development finance is secured against property, which may be repossessed if you do not repay. It is not regulated by the Financial Conduct Authority. Lending is subject to status, valuation, planning and lender criteria.

Dynesourcer Ltd is an IAR of Dynamic Commercial Finance Ltd. Products updated August 2026.