I Have an internal damp problem

ive recently had cavity wall insulation, since then I have had damp in my fitted wardrobes which has effected the clothes the worst area was my wifes area the wall paper in her end was saturated and black with damp but three months later abou two meteres away my area has been effected in the center of the wall our house next door is being renevated could this be a problem as no heating is on in that house

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