An elevator arrangement includes an elevator hoistway, an elevator car, and a movable supporting platform for supporting the elevator components in the elevator hoistway. The supporting platform includes a supporting frame. The supporting frame includes a plurality of beams that are rigidly fixed to each other. The plurality of beams are arranged such that towards each of all four lateral directions of the supporting platform points at least one beam end of the supporting frame, at which beam end is a movable support element belonging to a plurality of movable support elements movable between a position extended from the platform towards the side and a position retracted towards the platform.