Woodworm usually consists of holes in all forms of timber, with live infestations showing powder (frass) around the holes. The size of the holes varies, but are typically 1mm to 1.5mm in diameter for the most common household species. Adult beetles which emerged from the wood may also be found in the summer months.Read More
For an infestation to develop it typically requires that timber or wooden items contain a higher moisture content than is normally found in timber or wooden items in a typical home.
A building with a woodworm problem in the structure or furniture probably/possibly also has a problem with excess damp. The issue could be lack of ventilation in a roof space or floor void, penetrating damp, rising damp, condensation or pipe leaks.