Abstract: The invention concerns a set of differing beverage production machines (10a, 10b) presenting different sizes, the machines having a housing comprising:—one left, one right and one back side core housing panels (1, 2, 3),—one bottom housing, said bottom housing being selected in a plurality of bottom housings (5a, 5b) differing by their width sizes,—none or at least one back side extending housing panel (4) for laterally extending the housing,—none or at least a set of one left, one right and one back side extending housing panel (6, 7, 8) for vertically extending the housing.