The choice between a gable window, a roof window and a dormer depends on room depth, orientation to the cardinal points and roof shape. Before ordering the roofing, it is worth checking whether light from one end of the attic will reach its centre, how the window will connect with the insulation and the moisture-control layer, and whether overheating protection has been planned. Furniture layout and work areas also affect how the interior is perceived. Leave the final selection to the designer, who will assess the specific rooms.

Tile-effect metal roofing and clay tiles are best compared before the structure is approved. They differ in weight, format and the way they are worked on the roof. The price of the basic material shows only part of the expense. The choice should also be decided by the shape of the roof slopes, the details, the desired appearance and the conditions for later servicing of the covering. Steel tile-effect metal roofing is considerably lighter than many clay coverings. For example, with a tile-effect metal roofing weight of 4.7 kg/m², a covering of 160 m² weighs around 752 kg. Plain tiles weighing 1.6 kg each at a consumption of 36 pieces per m² give 57.6 kg/m², that is 9216 kg over such an area. This is a comparison of two specific examples, without battens, insulation and accessories.