Household appliance rectangular support base (100) for supporting at least one household appliance comprising an upper surface (S1), a lower surface, a first lateral side (L1), a second lateral side (L2), a front side (L3) and a rear side (L4). The support base (100) comprises a first and a second support part (10, 20), each configured to support at least part of an opposite side of a base of the household appliance. In addition, the support base (100) is formed by a plastic conformable upper sheet (101) comprising the upper surface (S1) and a plastic conformable lower sheet (102) comprising the lower surface, and comprises a plurality of reinforcement columns (5) in each support part (10, 20) distributed along the corresponding lateral side (L1, L2) and surrounded by air, each extending between the upper surface (S1) and the lower surface.