Existing educational buildings built with old normatives suffer a lack of technology, even though they are the frame of reference for our future society’s architects(/builders). These buildings, usually promoted by the public sector, don’t have significant economic investment, even if they are going to affect our children’s world perception. The object construction of this study is a building from 1978. It has an educational use located at the Pamplona campus of the Universidad de Navarra. The building is part of the Living Lab of the Campus, where technologies, solutions and strategies can be proved It is a protected building by the “Documentation and Conservation of buildings, sites, and neighborhoods of the Modern Movement” (Do. Co,Mo.Mo.), so all actions that can affect its aesthetic aspects need to be justified because of the value of the building. The methodology presented concerns the development of a replicable technical, constructive, and economical feasibility model to reach an off-grid disconnection of an existing building. The steps followed for this study are classified in seven main steps. This proposal aims to define a replicable solution that is going to be applied to other buildings of campus Universidad de Navarra in Pamplona. Even that the first solution is going to be limited by the aesthetic aspect, the final objective is to develop a Plug & Play solution following the methodology, answering the energetical deficiency and complexity of existing constructions.Read less <