Basement room not for apartment purposes? Hobby room possible?

Maybe someone knows this place.

I would like to buy a basement room with us in the multi-family house, in which TE stands "are declared as storerooms and can't be used for residential purposes."

That I use the net thing as an apartment or can rent is clear to me. But what does it look like when I turn it into a hobby room or put a sofa and watch a netflix series? I can do what I want in my basement, as long as I do not bother anyone or bother me or?

Can you do it, but you can't install a sanitary installation!

You can use any basement room as you please.

Only this will then neither a hobby room, nor living space.

What you can define as living space, you can find in the responsible for you state building code.

This must tell you the landlord, if you may use the room as a hobby room. Basement rooms, as well as storage rooms, belong to the so-called secondary use area. The building regulations say that no persons are allowed to stay in these rooms permanently (fire protection ordinance etc.).

Hobby rooms, like Atteliers, belong to the special areas of use. They have to be isolated differently against fire and noise emission.
In the planning permission was, to which use surface the space was assigned and approved.

Normally one builds a dwelling house so that special Nutzflächen and Nebennutzflächen are largely identical. This allows the owner to have a cellar, as in your case, sometimes become a hobby room without the need for construction measures and permits.

The Federal Court of Justice ruled that deviating use is only permissible if, in principle, it does not disturb more than the intended use;

Federal Supreme Court, Order of 16.06.2011, Ref.: V ZA 1/11

If any structural requirements are to be observed, you should ask the community;

I "buy it" So I'm not a landlord. I'm the owner myself. The building is about 2 years old (new building)

Then you can take a look at the plans that have been submitted to the building inspectorate. This can be seen, which usable area assigned to the room in question and as what it can be used, or as what he just can't be used. You can also ask the building insurance. That would be the authority that would come on stilts, if you were not allowed. Not asking questions is often more expensive than getting to the bottom of the question. Then there's clarity.