The project concerns the energy upgrade of the building of the Chamber of Lesvos. In the building of the Chamber of Lesvos, interventions will take place in the building shell (replacement of frames, thermal insulation, external thermal insulation of two sides of building, etc.) and upgrade of the E/M installations (heating-air-lighting system, etc.), to improve the energy efficiency of the building and the drastic savings of the consumed primary energy of the building.