New single-family house on sloping plot

Sure, just wanted to give you an indicator. You can make something nice out of hillside houses. If in doubt, have an experienced architect work up to and including service phase 4 and only go to the general contractor later. Then you'll also have comparative offers. That's what we did, for example.

Is the orientation a binding term in the development plan for the ridge direction? I thought that was only mentioned by the TE to establish the reference to the street / driveway.

The development plan specifies a ridge direction of North/South. However, neighbors have also been granted approval for a different orientation. Therefore, I assume that will also be the case for us.

Is the [Bebauungsplan] specifying a ridge height or only the eaves height?

Is the orientation a binding term in the development plan for the ridge direction? I thought that was only mentioned by the OP to establish the reference to the street / driveway.

The ridge orientation is defined by an arrow (with two arrowheads) in the legend/drawing. I assumed that it was only put into words like that by the OP. There is quite a bit there that was rather interpreted. But if you can discuss it with the office anyway... oops:

The development plan specifies the ridge direction as north/south. However, neighbors were also granted a different orientation. Therefore, I assume this will be the case for us as well.

Yes, but the ridge direction in the draft is east-west, or am I mistaken?