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Thanks - really helpful. I'm asking for more details of what is needed but think they were suggesting insulation under the concrete (which I have googled and is apparently a thing); maybe that is what makes it more expensive but not sure how much benefit it gives? Anyway I should probably stop spamming this thread as this isn't plant-based enough....
andyfallsoff
ColinTheBald
Yep, if the old slab isn't massively deep and/or reinforced.