Any flooring experts?

[tunnie]

Thanks 

Tiles are ceramic 

Take a photo, as I doubt a developer would use anything other than standard, cheap flexible floor tiles.

Ain't flexible floor tiles, one has chipped

[Viral_Jim]

FWIW, assuming the tiles are ceramic, I would use a self levelling compound to give a smooth finish, then put the floor covering over that.

Similarly, if there is a patch of floor without tiles, you can get some high build floor leveller (max c15mm I think).

Of course by the time you've done that and added carpet and underlay, you're probably up 1" on your starting floor level. Not necessarily a problem, as long as you can live with an odd door bar. In our last place, we put reclaimed pine boards down on a concrete floor, which took us up about 1". I graded this out over 2-3" by planing and sanding the first board in the doorway and when it was done it wasn't noticeable.

Personally I wouldn't bother lifting the floor - did it in an old house and, as said it was messy and an unpleasant job.

[dave the builder]

Isn't sorting out the old kitchen electrical,plumbing, plaster ,decor and floor part of the quote anyway, "making good" ?
in which case ,it's the builders problem 
you need a list of what is included and what is p̶a̶y̶i̶n̶g̶ ̶f̶o̶r̶ ̶o̶n̶e̶ ̶o̶f̶ ̶t̶h̶e̶ ̶b̶u̶i̶l̶d̶e̶r̶'̶s̶ ̶h̶o̶l̶i̶d̶a̶y̶s̶ ̶i̶n̶ ̶t̶h̶e̶ ̶s̶u̶n̶ "extras"

[tunnie]

I do have such a list. Flooring is extra, hence question.