PRECEPT aims to enable the “smooth” and at almost zero operational costs transformation of conventional residential buildings into highly efficient proactive residential buildings reaching an ambitious goal of 15% cost savings yearly improving in parallel the occupants’ well-being. The ultimate goal is to develop and deploy emerging user-centred and cognitive-driven techniques and fog- computing (Edge-Enable Proactiveness-EEP) devices for the transformation of residential buildings into proactive ones, while improving not only their energy-efficiency, but also the User Comfort, Safety and Health (EE&CSH) in a highly intelligent and delicate manner all different energy and well-being influencing devices of the building (PP-BMS). Special attention in the deployment of cutting-edge systems (EEP device and PP-BMS) will be given towards embed “plug-n-play”, self-learning, self- adaptive and self-cognition attributes.