Realistic costs for a single-family house?

Yes, I got some offers and samples from Holzprofi24. They even had an offer of €1750 for 155 sqm of design vinyl, but we didn’t like the sample that much. We liked the sample of the cork flooring all the more. Ebay is of course only sensible for smaller quantities. Our tiles for the utility room, for example, 9 sqm for a total of 15 euros. I don’t need the high-quality design tiles for that.

Yes, I got some offers and samples from Holzprofi24. They even had an offer for 1750€ for 155 sqm of design vinyl, but we didn't like the sample that much. We liked the cork flooring sample all the more. Ebay is, of course, only useful for smaller quantities. For example, our tiles for the utility room, 9 sqm in total for 15 euros. I don't need the high-quality design tiles for that.

Obviously, the tiles for the entire basement don't have to cost 50€/sqm, but I still don't want different ones in every room.
Apparently, I have a troubled relationship with vinyl.
Isn't there a hole if a knife falls with the tip down?

Yes, there would probably be a tiny hole in it - neither deep nor wide. For that, the (sharp) knife has to fall just right first

Do you have everything in tile?

Doesn't cork flooring insulate too much with underfloor heating?

I have dealt with the topic for a long time and was initially put off because cork naturally insulates very well. I read a lot and then spoke with several experts in stores.

--> If the manufacturer has approved the cork flooring (yes, even floating cork click parquet) for warm water underfloor heating, then it works. The insulation under the screed is even higher. If the thermal resistance of the floor is not higher than 0.16 m2K/W, then it works perfectly.
The floor covering then reacts noticeably slower (compared to, for example, a tile), but the room warms just as well. No higher flow temperature is necessary.

We will also go for cork click parquet (floating installation) in the bedroom and children's rooms. If you invest a little money there (not excessively much), you get a great, ecological, warm-underfoot, and robust floor.

If you invest a little money (not an excessive amount), you get a great, ecological, foot-warm, and robust floor

yes, that was also decisive for us; the decor we have is also quite appealing, whitewashed oak. and the floor is antistatic, we found that particularly good as well. We also lay it floating

Logically, the tiles for the entire basement don't have to cost 50.-/m², but still I don't want to have different ones in every room
Apparently, I have a troubled relationship with vinyl
Isn't there a hole if a knife falls with the tip down?

As I said, we only have 3 rooms with tiles. In a whole house I probably wouldn't do it either, but just tiles was out of the question for us. Today's design vinyl floors are extremely durable. You can even find these floors in dance schools.