Full basement hobby and office - underfloor heating, e-radiator or infrared heating?

perhaps an alternative,
have underfloor heating prepared up to the manifold and design a renovation system yourself

What is a hydraulic separator even for?
Sounds all weird.

Now I think to myself, I might as well do it properly with underfloor heating

One is not neater than the other; it’s simply a different system. Due to the negative association with night storage heater technology, people tend to glorify one and condemn the other. But as is often the case, it’s not that simple. We currently have underfloor heating everywhere, but our guest room is rarely used. We basically heat it all the time, even though we hardly need it, and when we do need it, we can’t warm up quickly because underfloor heating is far too sluggish. I miss individuality with this system. Since I had a normal radiator heating system in the old house, with which I was satisfied, I was looking forward to underfloor heating. Now I have to say that I find it quite nice but also recognize its drawbacks for me. We are now building a Kfw40Plus house and will heat the entire house with infrared heating, plus a central wood stove. Therefore, my decision would clearly be infrared heating in the basement, forward flow temperature. Not the floor in stone/tiles. If you want to use the room, you warm it up; otherwise, you don’t. I believe that this type of heating will be cheaper in daily use as well, since with underfloor heating you would always have to maintain room temperature or plan your TV enjoyment days in advance and still end up heating unnecessarily. In my opinion, your specific question here is precisely the perfect case against underfloor heating, not to mention the horrendous production costs. For example, you can also stylishly integrate modules into the ceiling, etc. Once you delve deeper into it and stop clicking through the carnival vendors, you will find something suitable.

Infrared heater? I'm curious about that.

Infrared heating? I'm curious about that

....and I even more so :D
Nah, I find it really exciting and have found good people for it, including the energy consultant who has implemented this many times.
But I know several architects who often implement it this way and will report myself.......but the digger is still waiting for the frost to disappear.

The costs include the actual heating system, an additional increase including higher screed, hydraulic separator, and the extension of the house ventilation to the basement rooms

and the question of ventilation does not arise with the other heating types? I dare to predict that the increase in the raw construction height of the basement is the biggest cost factor in this. Is the currently planned floor construction even suitable for different floor coverings and what is supposed to go in there? Tiles without underfloor heating in the basement are simply cold. For comparison: We have screed everywhere in the basement and controlled residential ventilation everywhere. Later, we retrofitted underfloor heating for a 40m² room in the basement. That cost us €1350 net including the additionally required distributor.