Concrete floor without screed on the upper floor/attic, what to do?

A forum is not an executive treatment in a private room: I and many other advisors here never write answers solely for the individual acute questioner, but always also for the dozen silent readers who are almost "attached" to such a visible questioner (and to whom you can very well give a hint in good time).

Why should it be "too late" here to settle for a floor covering appropriate to the house?

Yes, I think most readers have already grasped the idea after a few posts, just not me as the questioner ;)

By late, I mean to look for something else. Of course, we are open to any other opinions. Previous variants;

Concrete+
- primer + adhesive + parquet
- leveling compound + primer + adhesive + parquet (the house is actually quite new; probably part of the leveling compound can also be dismantled here?)
- Low screed height? + primer + adhesive + parquet (although the total height is greatly affected here)…
- The construction with battens, which was recommended above + insulation + parquet (floating)

Here we simply have to get the best out of cost/benefit...

Yes, I believe most readers have already grasped the idea after a few posts, only I haven't as the question asker ;)

So by late I mean looking for something else. Of course, we are open to any other opinions. Previous variants;

Concrete+
- primer + adhesive + parquet
- leveling compound + primer + adhesive + parquet (since the house is basically new, you can probably partially remove the leveling compound?)
- low height screed? + primer + adhesive + parquet (although the total height is greatly affected here)..
- The construction with battens, as recommended above + insulation + parquet (floating)

Here we simply have to get the best out in terms of cost/benefit..

Maybe as a guide, the ceiling height (from concrete) is 2.5m. The doors are 198.5 cm high, and the top edge of the raw floor to the bottom edge of the door frame is about 11 mm. I hope that gives some idea. Unfortunately, we don't have more details yet.

I would not base the whole thing solely on the door height, but also on the staircase. How high can the floor construction be so that the last step has the same height as the other steps?

Overall, you will find few people here who have your setup. With very few exceptions, everyone has a screed, if only because of the underfloor heating.

I would not base the whole thing only on the door height, but also on the stairs. How high can the floor structure be so that the last step has the same height as the other steps?

Overall, you will find few people here who have your setup. Almost everyone has a screed, except for very few exceptions, mainly because of the underfloor heating.

here I have 2 pictures from their website (but with laminate instead of parquet), one looking down (there we don’t have a ‘last step that must be flush with the floor’), and one looking up (here there is roughly estimated 20-30 cm up to the metal edge). I hope this helps a bit.. Ps: In the upper floor/attic we do not have underfloor heating.

The staircase will already have been installed by your developer. Each step in a staircase has the same height. If you now choose a floor construction height that does not match the step height, you will get a great tripping hazard.

The staircase will have already been installed by your builder. Every step in a staircase has the same height. If you now choose a floor buildup height that does not match the step height, you will get a great tripping hazard.

I see.. can't something be placed under the steps so that all (really all) steps are slightly higher.. We wanted to close the lower opening of the steps anyway..