additional wall to the stairwell

Hello,

if one wants to build a wall towards the stairwell afterwards, which materials are suitable?

Our house itself is built from Poroton.

In my opinion, a subsequent wall of drywall or aerated concrete would be possible. The wall must, of course, hold a door frame + door, so I tend towards aerated concrete.
Is that possible? What worries me here is the ceiling connection, although you can cut aerated concrete to a millimeter accuracy. The wall would be about 2 meters wide and ceiling-high.

What is your opinion?

Inform yourself about stud walls. They are simple and can also be assembled by laymen. Usually not really expensive either. A good alternative to aerated concrete, etc.!

Regards

Dana