Abstract: The invention relates to apparatus for collating and stacking building components, such as roof tiles. The apparatus comprises pairs of shelves for receiving and supporting tiles which are fed into the shelves continuously by means of a conveyor arrangement. The shelves are moved downwards towards a stack support positioned beneath the shelves. As a pair of shelves becomes the lowermost pair, the two shelves move apart releasing the tile carried thereon onto the stack support to form part of a stack. When the stack is complete, the stack support is removed and the number of shelves between the uppermost and lowermost shelf increased to enable a predetermined number of tiles to be stored in the shelves while the stack support is being replaced.