Advice on floor tiling

[dantheram]

Hi all,

I'm looking to tile a kitchen floor myself and have recently ripped up the original floor tiles. I noticed that at the entrance to my living room the tiles were sitting on a good inch of adhesive in order for them to meet the level of the living room and also the bottom of the doors in that area.

Presumably the tiler had worked up to this level by adding more adhesive in order to avoid a step. My question is should I do the same? Bear in mind that where the elevation was needed the tiler used a dot an dab style with inch an a half dot on the tile underside.

I'm confused about to tackle meeting up with another room which is at a different level.

 

[dantheram]

Here is a floor plan of the room to be tiled. Door A is an under stairs cupboard, the door sits approx 2 inches above the untiled floor. Door B leads to the living room and sits approx 2 inches off the floor - the gap is filed by carpet in the living room.

My question is do i have to close the gap under door A by raising the tiles up - as i mentioned this is how it was done before but the tiles were on at least an inch of thinset which had been applied dot and dab style.