As the urgency to decarbonise intensifies, existing buildings have emerged as one of the greatest challenges—and opportunities—in achieving net zero. With the vast majority of today’s building stock set to remain in use for decades, retrofit is critical to reducing emissions at scale. This panel explores the growing momentum behind what is increasingly described as a “radical retrofit revolution”, bringing together voices from design, engineering, policy and finance. It will consider how ambitious retrofit strategies, innovative technologies and new delivery models can transform existing assets, while addressing the practical challenges of cost, regulation, skills and coordination across the sector.