Mezzanine finance for permitted development conversions

Permitted development rights let certain commercial buildings be converted to residential use without a full planning application, subject to a prior-approval process that checks specific matters such as flooding, contamination, transport and natural light. The best known route turns offices into flats, and the class has since widened to cover other commercial and light-industrial uses. The appeal is speed and certainty: a redundant building in a decent location can become homes faster and with less planning risk than a ground-up scheme.

The catch is that prior approval is not a rubber stamp, the standards conversions must meet have tightened, including minimum space standards, and not every building suits residential use. Senior lenders like the speed but underwrite the prior-approval position carefully and stop short of total cost. Mezzanine bridges the equity gap on the conversion. We look hardest at whether prior approval is secured or clearly achievable, the deliverability of the conversion within the building's constraints, and the residential exit values.

A typical permitted development conversions capital stack

PD conversions carry prior-approval and deliverability risk, so senior debt is held prudently and mezzanine bridges to a converted, saleable scheme. Illustrative only; every stack is sized case by case.

What permitted development does and does not allow

Permitted development rights allow certain commercial buildings to change to residential use without a full planning application, going instead through a prior-approval process. That process is narrower than full planning: the authority can only consider specified matters such as flooding, contamination, transport impact, noise and adequate natural light, rather than the principle of the development itself. That is what gives permitted development its speed, and it is why a redundant office in a sound location can become flats faster and with less planning risk than a ground-up scheme.

But prior approval is not automatic, the standards have tightened to include minimum space standards, and some buildings simply do not convert well into decent homes. Senior lenders value the speed but underwrite the prior-approval position carefully and lend prudently against cost. Mezzanine finance bridges the equity gap on the conversion works so a developer can complete the scheme and reach a residential exit.

How mezzanine changes the equity maths

Permitted development schemes turn on speed and volume: the margin often comes from converting quickly and moving on to the next building, so tying up 40 percent of cost in one conversion slows the whole model. Mezzanine keeps the equity slice thin and lets a developer run several conversions in parallel. The mezzanine leverage calculator shows how the leverage lifts the return, and because some conversions with no existing senior facility suit a first-charge bridge instead, our guide on mezzanine versus bridging is worth reading before you choose a structure.

Exit routes we underwrite to

Permitted development conversions exit like any residential scheme: the flats are sold on the open market, or the developer holds and refinances onto a buy-to-let or investment facility once the units are let. Because the buildings are existing structures, the works are usually shorter than a ground-up scheme, so the term is often shorter too. We size the term to the conversion programme plus a realistic sales or letting period, and stress the residential exit values against local comparables for converted stock, which can price differently from purpose-built homes.

What our underwriting focuses on

• The prior-approval position: secured, in progress or speculative
• Whether the units meet minimum space standards and make decent homes
• Deliverability of the conversion within the building's structural constraints
• Residential exit values against comparables for converted stock

Where a conversion has no senior facility and suits a single first-charge loan, we can arrange bridging finance whole of market instead, and tell you honestly which structure fits your scheme best.