Senior development finance is capped twice, and in 2026 both caps bite at once. A senior lender will lend to roughly 60 to 70 per cent of gross development value, and separately to around 80 to 85 per cent of total cost — and the facility is the lower of those two numbers, not the higher. When build costs were flat and exit values were rising, the loan-to-cost cap was usually the binding one, and a developer with 15 to 20 per cent cash could start. Now the loan-to-GDV cap binds first. Tender prices have risen faster than achievable sales values across much of the country, valuers are marking GDV conservatively, and the two percentages no longer overlap. The gap between what senior debt covers and what the scheme actually costs is the problem this article is about.
Why the two caps no longer meet
Work an example in round numbers. A scheme costs 8 million all-in — land, build, fees, finance, contingency. The valuer signs a GDV of 11 million. Senior at 65 per cent of GDV offers 7.15 million; senior at 85 per cent of cost offers 6.8 million. The lender advances 6.8 million, the lower figure, and you need 1.2 million of cash or other capital to complete. Push the same scheme into a softer market — GDV marked at 10.2 million instead of 11 — and the loan-to-GDV cap drops the senior facility to around 6.6 million while costs are unchanged. The gap widens precisely when sales are slowest and a developer's own cash is most stretched across other live sites.
This is the mechanism developers underestimate. The shortfall is not a fixed deposit you can budget once; it moves with the valuer's GDV opinion, and the valuer is more cautious in 2026 than they were two years ago. Lead your file with the build-cost breakdown and a defensible GDV evidenced by genuine comparables, because the senior facility — and therefore the size of your gap — is set by those two inputs before any other layer is priced.
The three ways to fill it
Three instruments close the gap, and they sit in a strict order of repayment. Senior debt is first charge and cheapest. Above it sits mezzanine, then equity or JV capital, each carrying more risk and pricing accordingly because each is repaid only after the layer beneath is satisfied.
Mezzanine is second-charge debt that tops the senior facility up the capital stack, commonly taking combined leverage to around 80 to 90 per cent of cost. It is materially more expensive than senior — pricing typically runs into the mid-teens per cent per annum and beyond, reflecting its position behind the first charge. Mezzanine lenders require an intercreditor deed with the senior lender that sets out who gets paid in what order if the scheme stalls, and they underwrite the residual profit margin hard: if mezzanine plus senior plus costs leave too thin a cushion against the GDV, they decline. Mezzanine works when the scheme has real margin and the developer simply lacks the cash to deploy it, not when it is used to rescue a deal that does not stack.
Stretched senior collapses senior and mezzanine into one facility from a single lender, typically reaching 70 to 75 per cent of GDV or 85 to 90 per cent of cost in one line. It removes the intercreditor negotiation and the second-charge complexity, and it has re-emerged as a distinct product class in 2026 after thinning out in 2023 and 2024. The trade-off is a blended rate sitting above pure senior, and a single lender holding the whole exposure who will scrutinise your track record harder. For an experienced developer on a clean site, stretched senior is usually cheaper and faster than stitching two facilities together.
Equity or JV capital fills the top of the stack when debt alone cannot reach. A JV partner — often a specialist funder or family office — puts cash in alongside or instead of the developer's, and takes a profit share rather than interest. Splits commonly run between 30/70 and 50/50 depending on who contributes the land, the planning, and the risk. The developer keeps less of the upside but can run a scheme — or several — with little or none of their own cash committed.
How the stack gets priced, and the trap
Price the stack from the bottom up, because that is how it gets repaid. Senior takes its margin first; mezzanine prices off the residual risk above the senior charge; equity prices off whatever profit survives the two debt layers. The trap is treating these as independent line items. They compound. A scheme that looks healthy at 20 per cent profit-on-cost can be marginal once mezzanine interest at mid-teens rates and a JV profit share are both stacked on — and it is the developer's slice at the very top that absorbs the squeeze, because everyone below is paid first.
So the question is not "can I fill the gap" but "what does my own return look like once it is filled". Mezzanine is right when the margin is genuinely there and you are short of deployable cash. Stretched senior is right when you want one lender, one set of terms, and you have the track record to command it. Equity is right when the scheme needs more cushion than any lender will advance, or when you would rather run more sites on less of your own money and accept a thinner share of each. Decide which before you approach the market — switching layer halfway through reprices the whole stack and burns weeks you may not have on a site with finance already running. We size and sequence the full stack across property finance and equity introductions for developers in the property and real-estate sector, and the separate question of how you then exit that debt when the market is soft is its own discipline.