In the framework of the EU BUILD UP portal activities, the Sympraxis Team has undertaken the support of the portal’s webinars. The first webinar titled “Building and Ductwork Airtightness – Legislative Drivers, New Concerns and New Approaches”, which was held on July 1, 2013, was attended by over 90 people with keen interest, as shown by the numerous questions and comments posted to the speakers. The webinars are recorded and are made available through the BUILD UP portal. The next webinar is scheduled for September 10, 2013, at 17:00 – 18:00 CET, and will cover the topic “Energy-efficient retrofitting of residential buildings – A holistic approach is required”.