But is it better to buy a house?

Yes, it would be at least 321,459 then. But floors, wallpaper, kitchen, outdoor facilities, carport, etc. still have to be added. But if the bank gives €350,000, I would call it all in. You will need it.

It's no longer necessary.. it was already taken quickly before I could say yes!

Thank you very much for your answers and lively discussions! I have read everything. But they are already taken. There are still a few available, e.g. in Zülpich, Vettweiß, Elsdorf and so on... but I wouldn't want to live there.