A construction company has already indicated that this is not a problem. But if you sign something here and then it turns out that it is not possible to build such a house according to the building authority, you are stuck with the respective company – even though you might want to build another, approval-capable house better with another company.
*ahem* Nowadays every construction company builds a city villa, whether regional or nationwide; it’s not the construction method that matters, but the feeling you have with the construction company and the knowledge of the construction service description and the performance evaluation of the builder. If you have decided on a two-story body and also accordingly sign for a "city villa," it should not be a problem for a builder to change the roof or even something else, possibly with an extra charge, but that can be queried and negotiated beforehand. The builder instructs the carpenter to build either a gable roof (e.g., 30 degrees) or a hip roof (it’s called a tent roof if all roof sides are the same length). However, a gable roof on a city villa is not what a builder usually wants.
Imagine a shed roof (although there is nothing like that in the area).
... but unfortunately here there is the restriction of solar use.
A counter-running shed roof can be described as an offset gable roof – is the building authority lenient about that?
However, I have to contradict the last sentence, because if you align the roof surfaces in a north-south direction (if allowed), then you have the southern orientation for the solar thermal system?! In the case of a hip roof, the roof surface for an adequate solar thermal system looks rather poor, because the hip roof tapers sharply and the south roof only provides the minimum square meters for a solar thermal system.
Winsen... Aller or Luhe? Happy to share the street via private message... maybe I lived there once