Feedback on the house construction offer

Yes, I searched online for Q2 / Q3 and therefore the question seems to be that prefab houses are better in more than one way.

With a "prefab" house, you deal with dry plaster in the form of planar boards, whereas with a "solid" house, it is wet plaster on a more lively substrate – logically, this affects the effort required to give the wall a "perfect complexion." Classifying the "prefab" house as having a higher quality structure would clearly be a case of "Googling instead of understanding" – you understand more when you think for yourself ;-)

is there a reason why solid construction might still make sense

Since it is a duplex, in my view it makes sense in any case to agree on fish or meat for both halves (even though there are always voices praising heterogeneity as pluralism – but we are not talking about philosophy here, but about building technology).

I definitely can't claim to be an expert. But I have read the construction service descriptions and they seem more or less the same. Yes, I searched online for Q2 / Q3 and therefore the question of prefabricated houses seems to be better than on the way. Is there something they could be hiding?

There are books that explain what to pay attention to in a construction service description. I have one here from Stiftung Warentest and one from the Verbraucherzentrale. Each costs 20€ and a few evenings of time. But currently everything that’s fun is closed anyway, so time shouldn't necessarily be the limiting factor. It’s not the easiest reading, but I found it very helpful to see what is not included in the respective construction service descriptions.

Highlight the word bauseits in each construction service description; all of that you have to organize yourself and pay for additionally.

Then take one of the construction service descriptions and make a list (basically: foundation slab included yes/no, what quality, excavation removal included, which tile size included, which wall coverings, which equipment, what kind of heating, what material front door, etc.). Then compare that with the other construction service description. Afterwards, check which items are included in the second construction service description but are missing in the first. Finally, take the list from the forum about additional costs and compare it with your lists. Then you have a rough overview.

It's not what is included in a construction specification that makes the price high, but what is not included.

Every prospective builder should brand this with a soldering iron onto a wooden board, hang it in the kitchen, and study it intensively for 3 minutes every day.

I definitely can’t claim to be an expert. But I have read the construction specifications, and they seem more or less the same.

The comparison doesn’t show you what is missing. Some things can be missing from both specifications.

There are books that explain what to consider in a construction specification. I have one here from Stiftung Warentest and one from the Verbraucherzentrale. Each costs 20€ and a few evenings of time.

Very good tip

Highlight the word "bauseits" in the construction specification; all that you have to organize yourself and pay for extra.

Also a very good tip

And if something missing is discovered: talk to the provider, have it included or priced, or make a conscious decision to calculate and coordinate it yourself. That can amount to five figures.

Thank you very much for some good advice. I will use next week to compare the two [Bauleistungsbeschreibung]. I will get back to you if in doubt.

Thanks again.

I will come back in case of doubt.

suspecting that you also notice your doubts ;-)