Complete Guide to Development Finance in the UK

Development finance is short-term, project-specific lending used to acquire a site and build out new property. It differs from bridging finance (which is asset-based and does not assume a build), and from commercial mortgages (which assume an income-producing, completed asset). Development finance is built around the build itself - the loan flexes with the construction programme and is repaid at practical completion.

Most UK development facilities run between £250k and £150m, with terms of 12-24 months and rates from 0.49% per month. The facility comes in two parts: a day-one tranche covering the site purchase and initial fees, and a staged construction tranche released monthly against the monitoring surveyor's site valuations. The loan is repaid at practical completion through unit sales, a refinance, or a development exit bridge.

Senior development finance is provided by a specialist panel of around 30-40 active UK lenders - including Octopus, United Trust Bank, Hampshire Trust, Shawbrook, LendInvest, Atelier, Cohort, Fiduciam and the larger senior debt funds. High street banks rarely lend on speculative development outside their core relationship clients.

Senior development lenders price two leverage metrics simultaneously. Loan-to-Gross-Development-Value (LTGDV) caps the loan as a percentage of the finished scheme's gross sale value or open-market valuation. Loan-to-Cost (LTC) caps the loan as a percentage of total project cost (land plus build plus fees plus rolled-up interest). The senior debt is sized at the lower of the two.

Typical caps on the standard senior debt market are 65% LTGDV and 80-85% LTC. Stretched-senior facilities offered by a small group of lenders push LTC to 90% in a single facility. Above 90% LTC the gap is filled by mezzanine debt or JV equity. With all three layers stacked, true 100% LTC structures are achievable on schemes with strong margins.

The leverage maths matters because senior debt is the cheapest layer. Mezzanine costs 12-20% per annum (vs 0.55-0.85% per month for senior). JV equity costs a 50/50 profit share. The cleanest, cheapest stack is one where senior debt covers as much as possible - which is why getting the senior structure right is the single most valuable thing a development broker does for you.

Development drawdowns happen monthly in arrears against the monitoring surveyor's certified valuation of work in place. The cycle: contractor invoices developer, developer's QS approves the application for payment, monitoring surveyor visits site, MS issues a report to the lender, lender releases that month's drawdown. On a properly run scheme the cycle takes 5-10 working days from site visit to funds in the account.

The monitoring surveyor (MS) acts for the lender. Their initial cost report - produced before the facility completes - assesses whether the build cost is realistic, the contractor is credible and the programme is achievable. Their monthly site reports thereafter certify that the work claimed for has actually been done. Without an MS sign-off, the lender does not release.

The MS is separate from the quantity surveyor (QS), who works for the developer and manages cost, programme and contractor payments. On larger schemes the two roles are always separate. On smaller schemes (under £500k) some lenders allow a single chartered surveyor to perform both functions. Doulton typically instructs the MS on behalf of the developer and manages the monthly cycle.

Around 30-40 lenders are genuinely active in UK development finance, split across three rough tiers. Tier one is the specialist banks: United Trust Bank, Shawbrook, Hampshire Trust Bank, Together. These typically cap around 60-65% LTGDV and price the keenest rates (0.49-0.65% per month) but are stricter on developer track record and asset class.

Tier two is the institutional specialist lenders: Octopus Real Estate, LendInvest, Atelier, Cohort, Avamore, Fiduciam. These cover the broader spread of schemes, with stretched senior and mezzanine alongside core senior. Rates 0.55-0.95% per month, slightly more flexible on track record. This is where most developers under £20m sit.

Tier three is the senior debt funds and family-office capital: Maslow Capital, Pluto, ASK Partners, OakNorth, and a network of HNW funds and family offices. Generally smaller cheque sizes per fund but more flexible on structure and willing to do mezzanine, stretched senior and JV-style positions. Rates 0.65-1.10% per month.

Doulton holds direct relationships across all three tiers and benchmarks every case against four to six lenders simultaneously. The best rate is not always the best lender - the right MS panel, the right legal team and the right credit appetite matter equally.

Every development facility is priced with an exit baked in. The lender's underwriting model assumes the loan is repaid at practical completion - if it is not, default interest kicks in (typically 3-5% per month above headline rate) and the relationship deteriorates fast. So the exit has to be credible at submission.

Three routes dominate. Sales-led: units sold off-plan during the build or on completion, with the lender taking a partial release on each sale. Refinance-led: the development facility is refinanced onto BTL portfolio loans or a commercial term loan at PC, with units retained as income-producing assets. Development exit bridge: a short-term bridge taken at PC to unwind the development facility and give the developer 12-18 months to complete sales without time pressure.

Most schemes use a mix. A 12-unit residential scheme might pre-sell three units, refinance another four onto BTL and bridge the final five for a 9-month sales window. Doulton models the exit at submission and arranges the exit facility through the same case file - which is why exits on Doulton cases settle on time at a much higher rate than the market average.

The cleanest, cheapest stack is senior debt plus developer equity. But there are three common situations where stacking mezzanine or JV equity behind senior is the right call. First: the developer is running two or three live schemes and wants to spread equity across the portfolio rather than tie it all into one site. Mezzanine at 12-20% pa is cheaper than borrowing the same money personally from elsewhere.

Second: the deal has strong margin (20%+ on cost) but the developer cannot fund the day-one equity. JV equity from a profit-share partner fills the gap. The developer trades half the profit for the ability to do the deal at all - much better than losing the site to a competitor with deeper pockets.

Third: stretched-senior at 90% LTC from a single lender avoids the inter-creditor complexity of layering senior + mezz. On smaller schemes (under £5m) this is often the cleanest route. Above £5m, layered senior + mezz usually prices keener overall because the senior layer is cheaper than stretched senior.

All three structures work, but each has a different cost of capital, control profile and exit dynamic. Doulton models all three side by side on every case where the developer cannot fund the full equity gap from cash.

A clean development finance application has six core documents. Site appraisal (purchase price, planning status, GDV calculation, comparable evidence). Build cost plan (preferably a QS-produced cost plan rather than a contractor estimate). Programme (Gantt chart showing 12-24 month build sequence). Developer CV (previous schemes, photos, sale evidence). SPV structure (Ltd Co company number, directors, shareholders). Contractor proposal (firm tender, contractor experience, JCT contract draft).

Lenders will then request a RICS valuation (instructed by the lender, paid by the developer) and the monitoring surveyor's initial cost report before issuing a credit-backed offer. Solicitors run security, title and planning diligence in parallel. The total process - from initial enquiry to drawdown of the day-one tranche - takes 8-12 weeks on a clean case.

The single biggest cause of delay is incomplete or inconsistent documentation. A build cost plan with a 15% contingency in one column and 5% in another, a programme that does not match the contractor proposal, a developer CV that omits the schemes that did not go well. Lenders find these inconsistencies and slow down. Doulton's pre-submission review catches them before the lender sees the case.

After thousands of cases the same mistakes show up repeatedly. The first is over-optimistic GDV. Developers benchmark to the best comparable in the area; lenders' valuers benchmark to the median. Build the appraisal around the median - if there is upside, that is profit, not budget. The second is the contingency. Five per cent contingency on a 12-month residential build is unrealistic. Lenders expect 7.5-10%. Plan for 10%, the lender will accept 7.5%, you have 2.5% in your back pocket.

Third: ignoring rolled-up interest. On a £5m facility at 0.75% per month over 18 months, rolled-up interest alone is around £700k. Many first-time developers forget this is drawn from the facility and counts against the LTC cap. Fourth: the exit. Selling 20 units in 6 months in a soft market is not a credible exit. Model a 12-18 month sales window and a development exit bridge - the cost of being prudent is around 0.5% per month for the extra months, the cost of being optimistic is default interest at 3-5% per month.

Fifth: choosing the lender on rate alone. A 0.55% pm lender with a 12-week legal cycle and a slow MS panel will cost you more than a 0.65% lender with a 4-week legal cycle and a tight MS. Total cost of capital, not headline rate, is what matters. We benchmark on total cost on every case.