Prefabricated house provider selection experiences?

Beeeecause, I repeat myself, we have a soooooouth-facing orientation of the terrace/living room/bedroom. And there are no trees or any other shading in front. And because I have read very often from various sources that most of the heat comes in through the windows, and you can only really reduce it by shading. Ergo, awnings. Additionally, there are also roller shutters, but you don't want to sit inside in the dark in the afternoon to make it bearable. A power-consuming air conditioner was not an option.

If the weather is nice, you don't sit inside in the afternoon, so not in the dark either. If you think you absolutely have to shade, you can also do that with roller shutters because you’re not inside the house anyway. And consider how many days that really applies in Germany. I'm currently sitting in the garden at almost 30 degrees and the large south-facing window of the open space is open. If it’s then almost 30 degrees inside as well, in the evening we ventilate well with a draft, and it gets cooler in the house again. The bedroom faces northwest, there the roller shutters go down in the afternoon, so it stays bearable to sleep there. You can still install an awning anytime; try first to see how it feels living in the finished house and how often the heat in the house really bothers you.

I can’t say anything about the wall constructions and prefabricated house builders. They were already out for us in the first round because all had a lead time of 1 to 1.5 years.

But I also don’t understand your situation with your balcony; can’t you make a room out of it? You’d have to see the floor plan, but I understand that you don’t want to present it here.

So that exactly YOU ask this most pointless question, even though I clearly wrote that we are now making a FINAL decision and have been in the selection process for months. Then I definitely will not engage in this fundamental discussion for the 1000th time now, really not!

Now you are being condescending and disrespectful. I didn’t want to start a discussion but asked a question. A normal answer might have led to more background understanding of what is important to you, where your priorities lie, and to tips on how you can hopefully get closer to your decision successfully. But now I’m not interested anymore either, you’ve already found a better place for your needs anyway, so all good.

Who asks whether a 25 cm wall is too thick or too thin (sorry) has no clue about the subject. I want to see the wall that achieves the KfW100 standard with that. That's just a fudge calculated with the heat pump.

And regarding the floor plan. They build everything that can be roughly sawed and glued/screwed together.

You don't want to mount 3..5 awnings on the south side, do you?! That's why I wrote blinds.

And keep in mind how many days this really applies to in Germany.

That strongly depends on where in Germany you are. This summer, almost every place is likely to have a double-digit number of days over 30 degrees, many much closer to 20 than to 10, and the trend is not getting better. On top of that, there are the days in the high 20s. Basically, we've now had three months straight with daytime temperatures well above 25 degrees. When the sun shines through large windows, you need shading. I consider the concept of shading windows with awnings to be only moderately useful; this is usually done with roller shutters or blinds. Ideally, you have windows facing in different directions and can, for example, shade only the south-facing ones while the east and west remain bright. But of course, that's not always possible. Another approach would be to reduce the window areas so that less heat gets inside in the first place and to plan the rooms so that you preferably don't spend time in the hottest rooms. Appropriate landscaping also helps; you don't have to sit on the terrace at midday heat but can create alternative seating areas in the shade. There are many options, but you really need to discuss the floor plan specifically ;)

It really depends a lot on where in Germany you are. This summer, pretty much every place is likely to have a double-digit number of days >30 degrees, many much closer to 20 than to 10 and the trend is not getting better. Plus the days in the high 20s. Basically, we’ve had three months now with daytime temperatures well above 25 degrees. When the sun shines through large windows, you have to shade them.

I think the concept of shading windows with awnings is moderately useful; this is usually done with roller shutters or blinds. Ideally, you have windows facing different directions so you can, for example, only shade the south while the east and west stay bright. But of course, that’s not always possible. Another approach would of course be to reduce the window areas so you don’t get so much heat inside in the first place, and also to design the rooms so that you preferably don’t spend time in the hottest rooms. Appropriate landscaping also helps; you don’t have to sit on the terrace in the midday heat but can create alternative seating places in the shade. There are many options, but the floor plan has to be discussed concretely ;)

Sure, it depends on the place of residence. Unfortunately, we didn’t have that many days over 25 degrees. But you don’t HAVE to shade at over 25 degrees, not even south-facing windows. You can just live with summer on warm days. Who stays inside the house at these temperatures except to sleep? The only important thing is that the bedroom is bearable.

Who stays in the house at these temperatures except for sleeping?

Home office, doing homework, cooking,... Besides, you have to get every heat that accumulates in the house later back out again. After several hot days in a row with correspondingly warm nights, this only works incompletely and it gets warmer and warmer. Then you can no longer keep the bedrooms cool. This does not mean that everyone necessarily has to install an air conditioner, but I wouldn't downplay the heat. That doesn't do anyone any favors.