A commercial building advertised as having residential potential is a proposal to investigate, not proof that homes can be created as planned. Before relying on a conversion valuation, establish the lawful existing use, the intended use and the route through the planning system.
Start with the site
Gather the planning history, relevant decisions and information about the building. Ask a planning professional to examine the existing use and any restriction or condition. A previous occupier’s business name may not accurately describe the lawful planning position.
Check the current route
Government guidance explains when permission is required and the role of permitted-development rights and prior approval. These involve conditions and limitations, not a universal permission for every commercial building. Confirm the rules for the actual address rather than relying on an old consultation or a neighbouring conversion.
Separate other approvals
Planning is not the same as building-regulations approval, lease consent or every technical requirement. Identify which further assessments and permissions are needed. Ask advisers to explain dependencies so a favourable answer on one issue is not mistaken for approval of the entire project.
Examine the design
Use qualified professionals to assess access, layout, services and other relevant constraints. Identify work that could not be investigated initially and obtain a suitable next step. A sketch showing several units does not establish that the proposed accommodation is lawful, practical or suitable.
Connect findings to the budget
Update the scope and financial model as evidence arrives. Distinguish assumed unit numbers and sale values from approved plans and supported estimates. Consider the consequences of delay, further conditions or a decision that a different scheme is needed.
This editorial due-diligence guide concerns England and does not confirm permission, interpret a particular right or recommend a development. Other UK nations have different planning systems. Obtain property-specific professional advice before purchase, works or a commitment based on projected residential use. Reviewed 30 October 2026.
Source and further reading: https://www.gov.uk/guidance/when-is-permission-required