Arifas, many things can happen in parallel or the order does not matter. However, inside the pipes, whether water or electricity, must go in first, then plaster and screed. This is time-consuming because of drying times. The interior construction usually rests for about a month. Only when it is sufficiently dry can tiles and doors be installed, then the technology plus the sanitary elements be installed. In the end, the painter and floor layer come, which also often takes 14 days. Meanwhile, the exterior plaster, gutters, etc. can be done independently at any time. A common delay is often connecting the supply lines, gas, water, electricity, telephone. The utility companies are very overloaded and it often takes a long time, and no matter how much you beg and complain, it changes nothing. You wait until your turn comes. Since the supply and disposal involve civil engineering, paving, etc., this happens only afterwards. Three weeks can easily go by there as well. Your construction manager knows the construction schedule planned for you. Just ask him. Karsten