Why demolition needs planning judgement

The starting point for redevelopment should not be how quickly an existing building can be cleared from the site. Existing structures can be important planning assets. They may influence the scale of replacement development, support the case for intensification and, where the statutory tests are met, affect the Community Infrastructure Levy position. MHCLG’s March 2026 research into demolition, redevelopment and retrofit reinforces a point that is often underestimated: demolition is not just a construction choice. It is a planning decision with commercial consequences. 

The report does not introduce a new retrofit-first policy. It is evidence gathering, not a change in law. Its value is in showing where the planning system is currently unclear and where future policy pressure may emerge. MHCLG commissioned the research to understand whether national planning policy and guidance in England adequately supports decisions about whether buildings should be demolished and redeveloped, or retained and retrofitted. The research drew on 988 survey responses and 13 qualitative interviews across the built environment, including planning officers, planning consultants, developers, architects, engineers, surveyors, environmental consultants and community organisations. 

The central finding is that decision-making is not being supported by sufficiently clear policy. Only 10–21% of stakeholders agreed that policy is easy to understand and clearly indicates what action should be taken across different development types. Local policy performed only slightly better, with 32% agreeing that planning policies in their local planning authority clearly supported and informed decision-making. 

That lack of clarity matters because these decisions are often made early. The report found that demolition and retrofit choices commonly arise at feasibility or site due diligence stage. By that point, assumptions about land value,  development quantum, construction cost, programme, CIL and design may already be shaping the direction of the project. If those assumptions are wrong, or if demolition has been treated too narrowly, the planning risk can become more expensive to correct later. 

This does not mean demolition should be avoided in every case. Many sites will require redevelopment to optimise land use, deliver new homes, resolve structural constraints or meet modern operational requirements. Equally, retrofit is not always viable, practical or capable of delivering the planning benefits required. The important point is that the choice needs to be deliberate. Applicants should be able to explain why retention, partial retention, retrofit or demolition is the right planning outcome for that site. 

The report also confirms why this issue will become more prominent. Respondents identified financial viability and ease of delivery as key drivers for demolition, while local appreciation, sustainability and repurposing were stronger drivers for retrofit. More than 80% of respondents supported each of the policy options tested, including whole-life carbon assessments, clearer national guidance, consideration of retrofit within planning applications and VAT harmonisation between retrofit and new build. 

For developers and landowners, the practical lesson is not to wait until the planning application to explain the decision. Existing buildings should be assessed at the start of the strategy. Their planning value, carbon implications, CIL relevance, heritage or townscape contribution, structural condition and redevelopment potential should all be understood before the scheme becomes fixed. 

The strongest planning case will not simply say that demolition is necessary. It will show that the existing building has been properly considered and that the proposed approach is justified against realistic alternatives. That is where planning judgement adds value: not by resisting redevelopment, but by making sure the route chosen is commercially sound, policy-aware and capable of surviving scrutiny.