The invention relates to a method for mounting a prefabricated deck (31) on a boat deck (36), said prefabricated deck comprising one or more deck elements (02) and the method comprising the following steps: setting a target height profile (11) for the upper face of the prefabricated deck (01); generating a mounting height profile (22), which is spaced apart from, in particular spatially parallel to, the target height profile (11) in the direction of the boat deck (36) by the thickness of the deck element (02); measuring the upper face of the boat deck (36) as the actual height profile (21); determining the height difference (23) between the actual height profile (21) and the mounting height profile (22); producing at least one leveling means (38) per deck element (02), said leveling means having a material thickness that corresponds to the height difference (23); mounting, in particular gluing, the leveling means (38) and the deck element (02) to the boat deck (36), the surface of the mounted prefabricated deck (31) substantially corresponding to the target height profile (11).