From a building physics perspective, it is not possible to build a solid house within 3 months. It simply does not work. And everyone complains about mold in the hermetically sealed huts.
And when I see how construction is done and especially at what price, it makes me sick. But very often this results from the fact that people have no idea about anything.
Sure, you can no longer compare the working world with that of 40 years ago. Nor the FRG or the GDR.
The problem is rather laziness. Nobody wants to mix concrete, carry stones or dig a construction pit anymore. But I cannot just throw 60€ an hour and more to an electrician for him to cut slots in the Poroton. In the end, it is done by an Eastern European temporary worker. So I can do that myself.
The question always remains. Do I bust my ass for 2 years or pay the bank for 30 years.