Boundary distance building plot / forest

That is exactly not what I think is meant. After all, the forest grows back, and a forest owner will hardly forgo planting trees on the area for 100 years and on top of that still take care to keep everything nice and flat all the time. The strip would subsequently become overgrown with grass, which is ecologically nonsense as well. Forest areas are valuable; you don't just swap them for grass for fun.

At most, one can probably demand that the 1m distance to the boundary be maintained, although that is pretty nonsense in practice.

Honestly, I also don't understand what the building authority actually wants here – there is a building window and a development plan that was drawn up by the building authority or a planner and is legally binding. Then I build my house there according to the development plan inside the building window and that's it.

Of course, it could be that the development plan has a mistake and now the owners/parties are supposed to bear the consequences. But that doesn't work so easily if the development plan is legally binding; otherwise, the affected owners wouldn’t be the ones to suffer.

Regards
Dirk Grafe

We also purchased a forest together with our property in S-H and have to maintain a protective distance of 30m with our building. Whether this is also the case for you will surely be known by the responsible forestry authority.

Hello,

in S-H a 30m forest distance applies.
However, through negotiation / on-site appointment with the forestry office, one can, for example, reduce it to 25m with appropriate arguments.

Regards

A house construction is legally possible under planning law according to the Building Code Paragraph 34!!! And as Dirk Grafe already says, the problem is now being shifted to the landowner.

Nothing is being shifted onto anyone here. Depending on the federal state, distances to a forest in the legal sense are regulated by laws and/or regulations or administrative guidelines. As a rule, a distance of 25-35m must be maintained from the forest edge. Anyone who wants something different must simply sue against the rejection of the building permit....... The forest owner will hardly be confronted. Anyone acquiring a property must find out beforehand about its buildability.

I honestly don’t understand what the building authority actually wants – there is a building envelope and a development plan that was created by the building authority or a planner and is legally binding. Then I build my house in the building envelope according to the development plan and that’s it.

The OP doesn’t have a development plan and therefore no fixed building envelope.......

.. under the given conditions, it would be difficult for the OP to be allowed to build on the property within a reasonable period.

I would try to reverse the purchase due to deception.