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Howard-
I did see somewhere that cut ugh channels into a concrete slab to keep the floor the sameish height, but not sure that assures structural strength with a block and beam floor.
I’ve not got a way of measuring the floor thiccccness at the moment to help with that.
Any idea how much height ufh + screed adds to a floor?
seager
It looks like it was screeded before the current tiles were put down if that's what you're asking? I was sort of hoping to avoid a step up to prevent for 'flow' and having to increase the height of the door as well, but I guess you can't win them all!
The FiL did wonder about replacing the floor as well, similar to your block replacement suggestion, but would probably be beyond our price scope. I'm hesitant to even start looking at quotes knowing I'll have to start compromising right out of the gate.
So loose idea would be to end up take the kitchen out, lift the floor and insulate to 150-170mm, increase the height of doors and start afresh with a new floor for the kitchen, and then go from there?