Solid house or prefabricated house? Semi-detached house, approx. 160 sqm, pros and cons

For example, 29 to 36.5 cm is of course not a huge difference. Whether 10 cm gypsum board or 12.5 cm lightweight construction or 11.5 cm sand-lime brick is also not much. Drywall or gypsum board does not save wall floor area, but time.

I’m not really familiar with drywall, we only have solid walls. That's why I briefly googled and found drywall walls starting from 5 cm. That is naturally a saving compared to 11.5 cm + plaster, if you have several such interior walls. Sound insulation and load-bearing capacity are then presumably rather moderate?

- Weberhaus builds more ecologically, i.e. wood fiber instead of styrofoam insulation, but has a worse insulation value for that. Danwood achieves a KfW 40 wall with just under 35 cm wall thickness. (Plaster already included)

These were just the examples we specifically looked at. With 17.5 cm sand-lime brick and EIFS you get a similar thickness depending on the materials used. Monolithic construction is of course another story, it requires a few centimeters more. But comparing monolithic with a styrofoam wall is not entirely fair either.
My main point was the statement that prefabricated houses would be so much thinner. That certainly used to be true; we were at my parents’ over Christmas and the walls there (Okal Haus from the 80s) seemed really strange to me. So ridiculously thin, basically ;) Today, however, it has become much closer, and the question of thickness is probably relevant for very few builders.

Found drywall partitions from 5cm.

The narrowest stud is 50mm. But then you still need cladding on both sides. That comes to at least 75mm. However, under a 100mm wall with 2 x 12.5mm, I wouldn't use anything.

Then I withdraw the statement that savings can be made on interior walls ;)

What would you say about the living atmosphere?

In solid houses, I always have the feeling of stuffy air. Even if the patio door is open all day, I have the impression that I feel more comfortable in the timber frame house.
Is it just imagination? Is it ultimately just because of the [Wohnraumlüftung]?
What are your experiences?

In solid houses, I always have the feeling of thick air. Even if the patio door is open all day, I have the impression of feeling more comfortable in the timber frame house. Is it just imagination? Or is it ultimately only due to the ventilation system? What are your experiences?

I have the experience that telling such nonsense will probably never die out :)

I can only speak from my experience, and from that I can confirm the above-mentioned feeling. Objectively, it is certainly an apples-to-oranges comparison. Subjectively, however, it is perceptible. New building (rental apartment) in solid construction (without any ventilation systems apart from windows, quickly and cheaply built): about 2.5 out of 3 years musty, damp, stuffy. In the family, there are almost only wooden buildings (timber frame, solid wood, log homes, partly with masonry basement, partly without). In all these houses, the air is more pleasant (subjectively). Even the difference between the basement (solid) and the ground floor is perceptible. Old houses without ventilation systems, the new ones all with controlled residential ventilation either central or decentralized. The fact is, of course, that besides the screed, much less moisture is introduced in wooden buildings than in solid buildings. That moisture has to go away somehow. If you manage that well in solid buildings (which is possible), I suspect much less "unpleasant air" than in my rental apartment used for 3 years.