The farm has roof damage

Without reason, the part is not so cheap! Presumably, dozens of experts have already been on site and advised the potential buyer against it.

How does it look with monument protection for buildings from around 1800? You have entered Halle as the location in your profile - would the farmhouse be near Halle? Then 80,000 is also "normal" for the area, right?! Is there an ID on Immonet or IS24?

When the dads have the say :-) but I hope they're not crazy (because of the roof damage). Just kidding!

If you already know which trades obviously need to be done and you're unsure whether it's a "money pit," take a mason and roofer with you who can roughly tell you what the fun will cost.

The problem will probably also be the financing. Financing a farmhouse including renovation is not something every bank likes to do. Maybe it's normal in your region.

No, the farm is not located in Hallo but an hour away in a village. The farm is not under monument protection. We have now spoken with the owner again; he is having a carpenter take a look and is exposing the beams at the bottom. In my eyes, this does not suggest that he just wants to get rid of the farm no matter what. He has really put himself out. We have photos of how it looked before...
It is simply too big for him alone, just him and his little one, and he wants to put it in good hands.
Once he has reached a carpenter, we will go again to hear about it right away.
Financing is already secured.
IF the carpenter does not throw up his hands, we will dismantle the barn and stable down to the ground floor since we wouldn't use the dead space anyway and will have a slight pitched roof installed.
As I said, I am not an expert, but what I see on the roof beams doesn't look broken or rotten. However, it is of course an old beam that was certainly not installed just 50 years ago.
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A lot has already been done that speaks to us completely. =( We don’t want to fall into debt, but the farm would definitely be a dream.
What new electrical wiring costs is estimable, but not what is going on with the beams in the upper floor.
I read in another forum that a sagging of the beams by 5-6 cm is quite normal and does not necessarily pose a structural problem. Because 200 years ago it was different than today.
The low ceiling height only affects the children's rooms and the guest room, which we could live with.
We are both extremely unsure.

Precisely because it is a dream, one becomes blind and does not see the obvious! Invest a few euros in an expert and there will be no nasty awakening.

I would go through it with your own expert. Whether the bank will finance it for you is questionable, because the property in this location can never be worth the money you put into it. When it is finished, you will certainly have invested 180,000 plus property transfer tax, notary fees, etc., and you would never get this money back when selling. You can see this from the current seller. He can’t sell it and surely has to at least recoup what he has invested so far. That’s why he is now coming towards you. You have to be clear about that as well. If something were to happen, you would be deep in the red. So, it has to be a property where you want to stay, and nothing like a mishap (illness, death, divorce, etc.) should happen. I also find such properties incredibly great, but you have to weigh it very carefully. A lot has already been done, so at least you don’t have to plan for some trades in the next decades. So my tip: take an expert with you, look very closely, weigh everything carefully, etc. Just think very carefully about it. If it is your dream, the location suits you, etc.—then it can also be the right decision. We personally needed the security to be able to sell our house quickly and without loss at any time if necessary. Because it’s simply about so much money. But everyone’s mindset is different.

Friends of ours bought a small half-timbered house in a similarly poor location for around €20,000 and have been renovating it themselves for 8 years because they couldn’t take out that much credit. But they are happy with it, and that’s what counts. But even they would never have the chance to recover even a fraction of what they have invested if they sold. Rather, they would have to be happy if they could even get rid of it at all.