Wow! thats high,is there floorboards in one of the rooms?
take the floorboards up and sit the floorboards on 10mm lenght pieces of
wood on each joist,a bit tedious but cheaper than covering the whole floor
with 10mm plywood sheeting to bring it level.
Jus my tuppence worth.
Both floors are concrete.
The dining room is lower by 10mm, the cowboy builder of the kitchen
extension (before my time) decided floor heights didn't matter.
I've had lino in the kitchen and carpet in the dining room, the top surfaces
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