In our kitchen there used to be a wall. The wall was brick, in an L shape and formed a bathroom. There was a partition within too, for the toilet (old 2 door rule between toilet and kitchen). Next doors is still like this. Ours was removed about 20 years ago when the 2 storey extension was built, adding another bedroom upstairs and thus space for the bathroom.
Now the thing is, the bathroom had floorboards and the kitchen had concrete! Madness, I know. There's a height difference of about 5mm, which is barely noticeable, and was sort of disguised by putting cement where the wall was and forming a slope. However it has always been difficult to find a floor covering that had this tolerance without looking crap. How would you level it? The concrete is 5mm lower.
Now the thing is, the bathroom had floorboards and the kitchen had concrete! Madness, I know. There's a height difference of about 5mm, which is barely noticeable, and was sort of disguised by putting cement where the wall was and forming a slope. However it has always been difficult to find a floor covering that had this tolerance without looking crap. How would you level it? The concrete is 5mm lower.