I want to give an update here again and ask for your help. With our development plan, we now had to go through the standard procedure after all, and unfortunately, the whole thing has been dragging on for quite some time. This was mainly because we needed a species protection report and the expert was not getting moving. The report is now available and we will go into the second public participation at the beginning of January. According to the report, an "ecological construction supervision" is required. At the moment, I am still trying to somehow mitigate this and at least include it as a recommended measure only in the development plan, but I fear that won’t work. For the probable case that we have to commission supervision: Are there any requirements for such supervision or can it also be a "regular" architect? Wikipedia only mentions a few loose prerequisites, but obviously, they do not need to be proven anywhere. Otherwise, I haven’t found anything conclusive about who is allowed to offer ecological construction supervision. In any case, it does not seem to be a protected designation?? /edit: I could take such a course online for €650. That would probably be cheaper for me than commissioning someone. I even have knowledge of environmental law from my studies?!