From when does "building" count?

You have started several threads here with similar impetus – instead of beating around the bush here any longer, please tell us exactly what you are planning for the outdoor area. It certainly won’t be a treehouse, nor a dissertation on building law, right?

I have been researching many hours daily for a week and still do not understand much. What I plan: I want to build a small vacation house – really just a small wooden cabin – and over the years add a few things: a toilet shed (composting toilet), sauna, shower, etc. (All in a closed cycle without connection to public utilities)

Holiday homes in the open countryside are not considered privileged uses, so no.

In case of doubt, you can also inquire in writing at the building authority.

One or two mobile homes, gladly also with a sauna and shower, would be possible. These would not be structurally connected.

Construction trailer

I just want to briefly point out that various forest kindergartens using construction trailers as emergency weather protection still have problems with building regulations.

I want to build a small holiday home

There is no legal way to realize your project in the outer area. If you park your caravan there five times a year for two to three weeks, no one will probably take action against it. However, besides building regulations, there are countless other regulations you can violate, ranging from federal and state nature conservation laws to local drainage statutes.

Here in Brandenburg, someone once got into trouble because of a stack of firewood, as it is "permanently connected to the ground due to its own weight" and therefore considered a structure... The objection that the employee of the building authority is also permanently connected to her office chair due to her own weight, and therefore considered a structure, did not ease the situation...

You have started some threads here with similar impetus – instead of beating around the bush here all the time, please tell us exactly what you intend to do outdoors. It certainly won’t be a treehouse, nor a dissertation on building law, right?

It is disrespectful to call my requests for information "beating around the bush." I also do not call your answer "babbling."