Massive house construction company in the Bamberg area and experience with Lignotren

Well, with a recessed top floor and if being lazy about stairs (2 floors are probably enough), I would turn necessity into a virtue: a two-story "Tuscan villa" and make the usually common hipped roof attic into a shed roof, which might be set back a bit so that the recessed top floor requirement is met. Up there would then be the basement replacement rooms (storage, connections, heating, guest room). A roof is needed anyway, and a shed roof is generally the most cost-effective version of such. And there remains enough space for these rather rarely used rooms, which are also better lit than in a relatively expensive basement. Win-win.

No, as I said. It should be a flat roof. But I would like to put our bedroom at the very top and thus enjoy the roof terrace. The question is rather whether we should build a basement ([weiße Wanne]), since the plot is under 250sqm and therefore tiny.

Well, EG and OG at 9x9.5 will already be around 140 m2 alone. Plus the penthouse floor, let's say 40 m2 on top, that would be 180 m2. Do you really still need a (noticeably more expensive per m2) bunker, uh basement?

And why does it absolutely have to be a flat roof? That is quite expensive and elaborate.

A shed roof can also rise from about 2 meters height to 3 meters, at 2/3 of the house depth, so about 6 m deep. That would still be relatively flat and well usable.

As stated, fixed regulations. I am attaching a picture of the project.

Well, the ground floor and upper floor at 9x9.5 will already be around 140 m2. Plus the attic floor, let's say 40 m2 on top, that would be 180 m2. Do you really still need a (noticeably more expensive per m2) bunker, uh, basement?

Yes, that's exactly the question, we are really undecided about this as well

The development area is called: Aufseesianische Wiesen, in Pödeldorf.

I couldn’t find this on the municipality’s website, of all places (?) :-(

I just meant that prefab house providers, unlike the solid construction providers, are much more “present,” whether on the internet

Industrial products generally have a much more extensive active marketing than craft products. In addition, prefab house providers are usually large companies, while many solid construction contractors, on the other hand, are owner-managed. This also applies to timber house builders operating as carpentry businesses. Solid house providers are much more often masons than panel prefabricators. All of this are reasons why you have to look for panel solid builders almost with a magnifying glass (at least regarding houses; basement builders are more present—which in turn is related to the fact that they often work nationwide for the “from OKKD” prefab builders).