Hello!

I'm going to install a click-floor, Marmoleum. Now that I've torn out the old kitchen, which is built as a rectangle, the entire room approximately 260 x 650 cm, I notice that the floor starts to slope sharply after two meters and after three meters it has sunk two centimeters before leveling off.

What do I do? It would be a bit odd if the base cabinets are 90 cm on one end and 92 on the other?

It’s difficult to raise the whole floor by two centimeters since I have a balcony door on the other side of the kitchen, and then the floor would come up way too high.

??????
 
2 cm on 3 m is not very dangerous.. Set the base cabinets at 89 cm at the highest point. Otherwise, you have to lower the floor where it is highest.
 
Thank you Kimpo for the response, but I was unclear. The room is very elongated and after 2 meters the slope begins, and already at 3 meters there is a 2 cm drop, meaning the floor drops significantly over one meter (between the 2nd and 3rd meter into the room).

But maybe I should try to get a leveling slope over 3 meters where the floor drops 2 cm.

?
 
I come up with 2 possibilities. Start from the lowest point at the balcony door and raise the floor as much as possible there, then level out from that point up to where the floor is highest. Alternative 2 is to start 3 meters out from the opposite wall and remove the higher part, so the floor continues flat from the lower point to the wall. The methods for doing this depend on what type of floor you have today. For joists and wood/board flooring, I would raise by joisting up and adjust the balcony door if needed, or alternatively plane down the joists if it's too high. For concrete flooring, I would raise by self-leveling the lower part or chisel away the higher if I didn't want to work with the balcony door. Chiseling away 2 cm of concrete floor is not a difficult job and as you describe it, the self-leveling should be even easier.
 
Hopefully, the balcony door opens outward "as seen from the room." Then you might raise the floor and also raise the threshold to the balcony door by 2 cm. It's always easier to raise a floor than to lower it!!
 
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