Final inspection before contract signing Water damage found

If aging is present and/or necessary repairs are omitted, the insurance will refuse.

that would be a so-called "Sanierungsstau"
I also had the opportunity to learn this little word (house approx. 270 years old )

A problem could also be that the water damage occurred while the property was unoccupied. Because if someone had lived there, the damage would have been noticed much sooner. No idea how fussy the insurance is and how they want to talk their way out of it.

But how severe is the damage now? I see slightly damp walls in the picture. Can't they just be dried and everything will be fine again?

Yep, unoccupied is the keyword. If the seller did not report the vacancy to the insurance (and I bet she didn’t), they are free from liability.

Apart from that, I don’t really see the actual damage in a house that is going to be completely renovated anyway. If the floor can be removed anyway, the screed can also be dried without any problems, depending on how urgent you are it even dries by itself. I would either try to get the price down again because of the damage (the more the better) or make an agreement that additional costs caused by the damage are to be borne by the seller. She will be reluctant to do the latter, so she’ll just knock off a few thousand and that’s it.

Maybe one could even go so far that the saleswoman covers the costs of the construction dryers and then it’s fine. As I said, it depends on how much you want the property, how many other interested parties there are, and so on.

that would be a so-called "renovation backlog" I also got to know that little word (house approx. 270 years old )

Yes, but not after 30 years, I think something was renewed as it looks, besides, it is not always due to age, a slipped seal during pressing or forgetting to press also causes leaks.

If aging is present and/or necessary repairs are omitted, the insurance will refuse.

Hello

That is not correct.
The insurance will settle the damage. Replacing the damaged section of the pipe as well as drying and restoring wall and floor coverings including all necessary work is covered by insurance.
Any additional and necessary work on the water, sewage, or heating pipes is the owner's responsibility.

If there is screed installed, it will be dried or, depending on the floor structure, also dismantled.
After completion of the drying measures, the condition is as it was before the damage.

Olli