Two numbers size the facility. Loan to gross development value caps the total advance against what the finished scheme is worth, typically at around 60% to 70%. Build cost cover sets how much of the construction the lender will fund, commonly up to around 90% to 100%. Whichever binds first is the one that matters, and on a scheme with a strong end value it is usually the build cost side.
Money is released in drawdowns, normally monthly in arrears, once a monitoring surveyor has valued the work in place. You fund each stage and are reimbursed, so cash flow through the programme is a live constraint rather than a detail. Interest is usually rolled up and settled at the end, which makes it part of total cost and therefore part of the appraisal from day one.
Development schemes are structured to the scheme rather than to a headline range. The £2 million ceiling that applies elsewhere on this site is not the limit here: where the appraisal supports it, the facility is built as a senior tranche and, where the equity has to stretch, mezzanine behind it.