The project concerns the energy upgrade of the school building 1 year of construction 1985 at 26 Tydeos Street, which houses the 24th Primary School of Thessaloniki More specifically, it concerns interventions in the shell of the building replacement of frames with new high energy efficiency and glass blocks with new energy placement of horizontal shades on the southeast side installation of an external thermal insulation system with rock wool thermal insulation of the roof as well as in EM installations replacement of lighting with LED The building included in the Energy Performance Plan of SEAK Buildings of the Municipality of Thessaloniki SEAK classification 31 is expected after the energy upgrade interventions to reach energy class B from Z which is currently upgraded by 4 energy classes