So, now it's my turn as well. I had the interior staircase removed and am now contracting it out myself. Because of this thread and since I now know my main contractor, I asked him how the construction staircase situation is. Of course – I have to provide it now, it was practically tacitly included with the interior stair supplier but now has been cut out. Since the construction services description does not explicitly include a construction staircase, I guess it's up to me anyway. But that's not really what it's about now whether I should or shouldn't, but thinking about the staircase and whether I just build it myself, I'm currently wondering how the other work actually works? So masons, carpenters, and roofers all come up via the scaffolding. But by the time the windows are installed, you actually want a staircase. Ok, I'll just build it then. But actually insulation and finally the screed come only after the windows. Is it then laid around the staircase and later filled in? Or does the construction staircase have to be taken away in the meantime and rebuilt after the screed has hardened? Or does the screed come in so late that the electrician and heating engineer have already finished their work enough to wait for the real interior staircase (according to the stair builder six weeks after screed, measurement only after screed)? Does anyone know? There is talk about sequences on the internet but I can't find exactly this interface...