A system and method for automatically manufacturing custom parts for use in a prefabricated construction site includes scanning a room under construction. The method also includes determining, based on the scan of the room, an image of an installation location in the room. The method also includes calculating, based on the image of the installation location, alteration dimensions for a prefab part. The alteration dimensions comprise alterations to the prefab part to match spatial dimensions of the installation location in the room. The method additionally includes transmitting, via a network, the alteration dimensions to a factory. The factory fabricates a custom prefab part according to the alteration dimensions.