Certainly it will be necessary to determine where the moisture's coming from, the floor's construction and whether or not it has a damp proof membrane fitted.
It is not necessarily the case these days that the floor has to be dug up. As long as you can get back to sound concrete,˙modern resin coatings can be used to resolve the dampness problem, although you may have to sacrifice the existing floor screed and re-lay a new one on top of the resin layer.˙˙˙
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