Savings potential in turnkey prefabricated houses - assessment?

Just for your information: Viebrockhaus does not build prefabricated houses, nor with Ytong.

And yes: even cheap house builders have such a standard house in their repertoire.

Can you name a few "Billighausanbieter" that do not build using timber frame construction?

Can you name a few "cheap house providers" who do not build timber frame construction?

The sentence contains a contradiction: in the single-family house sector or also semi-detached houses, prefabricated houses in timber frame construction are still more expensive than solid construction. But nevertheless, a prefabricated house in timber frame construction can still fall into the lower price segment if the timber frame construction is executed cheaply and services are not included.

I am nevertheless surprised by your question, since the headline only talks about prefabricated construction and where did the timber frame construction appear in the thread?

Be that as it may: take 1800-2000 per sqm of living space, then you are well within standard. Also for timber frame construction. For all offers below that, a poorly detailed construction service description or a simple standard in the finishing trades awaits you.
With solid construction, you can clearly see it at Heinz von Heiden: hipped roof in the bungalow not walkable, thinner rafters than more expensive houses. Painter-ready also applies to roof eaves and you have to order the container yourself.
I would see timber frame construction in cheap quality as last place (upwards) at Danwood. Any change costs a good amount of euros more.

Otherwise: what are you getting at? What do you want? I think you confuse some terms so that you are talking past each other here.

It shall be Ytong. Like the prefabricated house from Viebrockhaus would be

As already said: nonsense

We have an architect who will first take care of the building permit etc.

Building application leads to building permit. Your architect is doing a preliminary building inquiry.

This will not end well, because I don’t think Viebrockhaus deals with such "problem cases" or pours their heart into pushing through such special cases

A builder or general contractor builds you a house on your plot. The plot will always be _your_ problem. On the construction side this is called that. Additional construction costs also come at _your_ expense.
You are well served with an architect.

Thank you very much for your reply.

I think we are really talking past each other a bit... For me, a prefab house is a house that I can basically choose from the catalog and assemble like a car, without it being freely planned by an architect.

Then I probably had a wrong understanding of the terms, sorry.

The house we want to build should definitely be a solid construction (it probably has to be, since we have our architect...).

Our architect simply takes care of all the paperwork with the building authority and always has the building code at hand in case any problems should arise... And precisely because he is passionately involved as an "expert," we cannot go to a company like Viebrockhaus etc., because the building application (or the preliminary building inquiry) is not as simple for us as it is in a new housing development.

I think then people are really talking past each other a bit... For me, a prefabricated house is a house that I can basically choose from a catalog and configure like a car, without it being custom-designed by an architect.

That is then called turnkey.

The sentence contains a contradiction: in the single-family house sector or also semi-detached houses, prefabricated houses in timber frame construction are still more expensive than solid construction.

That is exactly my observation as well, but as can be read here , this apparently no longer always applies.