This webinar provides an introduction to radon, from what it is, why it poses a significant health risk, and where it is most commonly found. It will explore the key factors that influence radon ingress, outline current UK regulations, and explain protection measures required for new and existing buildings. There will be an opportunity to understand best practice approaches for testing and assessing radon risk in both pre‑development and built environments. Finally, the webinar outlines practical mitigation strategies, highlights common challenges, and reinforces how effective design, testing, and CQA can reduce radon exposure to safe levels.