A mismatch between permitted development rights and available finance products has created challenges for landlords seeking to convert commercial properties into residential units, according to industry observers.
Class MA permitted development rights allow landlords to convert shops, offices, and other commercial units into residential flats without a full planning application. The policy has gained relevance as national retail vacancy stood at 13.5 per cent in the third quarter of 2025, leaving tens of thousands of units empty or underused across the country.
Finance market adaption lags policy
The issue centres on how development finance lenders assess these conversion projects. Professional developers with track records and established lender relationships typically face fewer obstacles when seeking finance for larger schemes. However, landlords converting smaller numbers of units above commercial premises often lack the documentation and profile that development finance underwriters expect.
The situation is compounded by inconsistent lender policies. Some development finance providers price permitted development conversions close to standard refurbishment terms, recognising that the absence of planning application requirements reduces project risk. Others continue to underwrite as though planning risk exists, regardless of the permitted development route.
Existing mortgage complications
Additional complexity arises when properties already carry commercial mortgages. Converting a property with an existing charge requires coordinating the unwinding of that charge, arranging development finance, and then refinancing completed flats onto buy-to-let terms. This three-stage process requires planning before work begins.
The financing challenges come as the landlord sector faces broader regulatory pressures, with limited company structures now accounting for 45% of buy-to-let ownership as investors adapt to changing tax and regulatory environments.
Market implications
While individual permitted development conversions typically involve smaller unit numbers than major residential developments, the cumulative impact across high streets with vacancy problems could be significant for housing supply. However, accessing appropriate finance remains a barrier for landlords without specialist mortgage broker support.
Key questions facing landlords include acceptable loan-to-GDV ratios for conversions versus new-builds, requirements for clearing existing commercial mortgages before drawdown, and contingency planning if projects overrun and exits shift from sales to buy-to-let refinancing.
The permitted development conversion market appears to require greater alignment between policy frameworks and available finance products to fully realise its potential contribution to residential supply.
