On Thursday 30th April 2026, Knauf Energy Solutions and Healthy Homes Hub hosted the inaugural SMETER Roundtable in London, bringing together leaders from government, academia and social housing to discuss how measured performance is reshaping retrofit decision-making. This white paper captures the key findings from that discussion, from the scale of the gap between assumed and actual home performance, to the policy shift already underway at DESNZ. Readers will come away with factual evidence, practical case studies, and a clear set of recommendations for housing providers and policymakers looking to move from guesswork to measured, evidence-based retrofit delivery.