Up to 6,490 mm wide and 1,200 mm deep, each in 10 mm increments. The price is based on the next step in the price list (width 2,000, 2,500, 3,000 mm and so on; depth 800, 1,000, 1,200 mm). A porch roof 2,980 mm wide therefore costs the same as one measuring 3,000 mm.