Hello,
thank you first for the detailed answers. Quite a lot has already come together and also many things have become clearer :)
Escroda seems to know the development plan very well ;-) The questions concern a plot in the section "WA1a", so the issue with the specified embankments does not apply.
The plots in this section "WA1a" consist of several plots running from east to west, all of which are partially significantly lower on the west side (especially in the rear area) than on the east side. The last plot at the end of the street alone has a height difference of > 5m (!), but it also represents an exception.
We have not yet been able to talk to the neighbor about anything (unfortunately we do not know him personally yet, as the plot was only just sold), only it is the case that he presumably will not embank his plot on the east side (our boundary), since his plot on the west side is about 3m lower than on the east side (why would he then want to raise it higher - I suspect he would rather dig down if he wanted to change something).
We have it similarly (compared to most other plots even relatively weakly expressed). On our property the west side in the rear area is about 2m lower than on the east side in the rear area. On the east side everything should stay as it is, since the next plot adjoins there and the neighbor there also does not want to change anything.
We want to make the garden behind the house as usable as possible, so for example children can play there or a small utility garden can be laid out, therefore at least part behind the house should be reasonably level - or only slightly sloped - and not too steep.
That we cannot achieve a completely flat plot to the boundary like in northern Germany is clear to us ;-) Hence also the questions about the development plan and what is permitted here.
What I have now understood is the following (please correct me if I am wrong):
According to the development plan, we may build a retaining wall at the neighbor’s boundary with a maximum height of 50 cm above the existing terrain, which apparently does not have to be a natural stone wall, since the development plan does not allow more except for ancillary structures (which we do not have on the side).
This means that on the plot itself (a sufficient distance from the boundary), walls may in principle also be >1m (and do not have to be natural stone) as I understand it, provided embankment is done. Correct?
If you want to dig down, the limit is 1m (this does not apply to us, since on the east side towards the neighbor we want to leave the terrain as it is and not dig or support anywhere).
What other options do we have on the west side to make the plot somewhat more level in this area? For example, how are embankments dealt with (which must of course be properly secured and lie on our plot - but also require corresponding space)?
From when is a retaining wall considered as such according to the development plan?
Thank you for your feedback.
Regards
Karl