The fourth plenary meeting took place at the Cardiff City Council in Cardiff, Wales. The duration of the meeting was three days, from the 20th to the 22nd of November 2018. The first day of the meeting a visit was paid to the Cardiff pilot site. The two days left were dedicated to the progress made so far on tenders, the façade design details, the façade technologies selected, as well as the details concerning the sensors / equipment picked in all four pilot sites. Finally, discussions were made among the participating consortium members about requirements analysis and the PLUG-N-HARVEST ADBE System.