It is true that a building needs to dry properly, but that can also be achieved if it is heated correctly. In the first winter, a lot of moisture escapes from the walls and the plaster. You need to heat well and ventilate a lot, then there will be no mold.
We moved into our house in May and had to heat and ventilate very well during the first year. And that despite the construction drying out over the winter, I don’t think you can avoid it. But the moisture has to come out, you are right about that.
I can only advise you to start building as soon as possible, because everything gets delayed during construction, that is normal. We had already given notice on the old apartment, and yet the craftsmen still took a lot of time. Better to start earlier, because you won’t move in any sooner otherwise.
Hi, it doesn't really matter when you start, because whether in April or June, the house definitely needs to be finished before winter. It's always very nice to be in your own house by Christmas, that makes it a very special celebration.