Sometimes only trust helps. You can write down so much in advance, but in the end there is always a reason for a construction delay notice if the contractor wants to make an issue out of it. Since we are in Germany, there are naturally regulations for the conditions caused by environmental influences. "At temperatures above 5 degrees Celsius, only a few precautions are required to be able to continue operating the construction site." For shell construction work, the DIN standards 1045 (concrete work) and 1053 (masonry work) regulate the processing temperatures of building materials in winter. The requirements of the standards DIN 18550 (plaster and plaster systems), DIN 18560 (screeds in construction) as well as DIN 18181 (gypsum plasterboards in building construction) are derived from the aforementioned regulations. Additionally, scaffolding must, of course, not be iced over. Therefore, the safety of the workers must also be ensured. So it seems that much is regulated, but as mentioned, a reason for a construction delay notice is quickly found.