Resolve damp issue - leaking pipe? - Plumbing job in Farnham, Surrey

Job description

A damp patch has formed above the window and at first it was thought this was to do with a leaking roof but this has now been resolved and the damp patch is getting worse. Now I suspect that there may be a problem with a waste pipe from the upstairs sink which is causing this. What do I need? A plumber I suspect but maybe a general builder?

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