I have a walk-in cupboard, in which the floor is an inch lower than the room it opens onto (because it used to open onto another room, and I knocked a doorway through into another room instead). Both the upper and lower levels are solid floors (ie concrete), in good nick, and level, and there's an inch-deep step down into the cupboard. The floor area of the cupboard is approx 1.4 sq metres (he says, mixing his units as usual).
What's the best/easiest way to tackle raising the level of the cupboard floor? Seems too much for a levelling compound job? Should I use concrete or cement instead? Advice on what mixture I should use would be much appreciated.
Thanks David