Construction costs are currently skyrocketing

I would have said just take the panel off and unplug it so that the basement window can be closed? It won't cause any great enthusiasm among the plasterers if they have to tape the windows again for the topcoat, that's clear. But that's their job. The basement window can't stay open all the time at 4°C at night, can it?

Similar for us, it dragged on forever. If possible, I would have the plaster done before moving in. I then cut slots into some windows after the base plaster, because there is at least a 2-week break between the base and top plaster. And then another few days before painting. In case of doubt, the plasterers can simply roughly stick a foil over the slot.

For us (prefabricated house in timber frame construction), it was different. The subcontractor of the prefabricated house manufacturer was there for one day and masked everything and plastered. I don’t know how many layers, as I was not on site all day. The protective foil in front of the windows was only applied for that one day.

With us (prefabricated house in timber frame construction) it was different. The subcontractor of the prefabricated house manufacturer was there for one day and taped everything off and plastered it. I don’t know how many layers, as I was not on site all day. The protective film in front of the windows was therefore only applied for that one day.

You can't compare a prefabricated house, as you have a completely different starting point. It's more like the top coat plaster in solid construction. In solid construction, you first have to seal all the gaps in the masonry with the base plaster and even out irregularities.

You can't compare prefab houses, you have a completely different starting point there. It's more like the topcoat in solid construction. In solid construction, you first have to seal all the gaps in the masonry with the base plaster and even out unevenness.

Thank you for your answer, now I have learned something again. Maybe your hint is also helpful for others.

As if they heard me whining yesterday, the plastering crew came today and after a week’s break, work continues. I hope they finish soon and don’t really wait 2 weeks between the two coats :D We need to talk to the BU about the window, but I also think it can’t stay like this forever. I’ll take another look at it in October, but from November onwards I’d like it closed, because I’m heating out the window. But I can’t just remove it myself. The plug is too thick for the tilted window, and on the other side (inside) there is no plug, an electrician has to disconnect it.

Why no three-phase socket outside?

The drying time for exterior plaster is 1 day per millimeter of plaster thickness. So if 20 mm of plaster is applied, it should be allowed to dry for 20 days. In damp and cold weather, it can sometimes take a little longer.

I would definitely not have my finishing coat applied after just one week but wait at least 20 days.

You can also tape the tilted window with foil sometimes, so that all the heat from the house doesn’t escape.
I can certainly understand all the frustration with craftsmen at times. If you have customers like that, you don’t need enemies.