Elsewhere on this site you will find a short video about the death watch beetle.   That is a severe problem if you get and it needs to be taken seriously.   However, more frequently found is the common furniture beetle (anobium punctatum).  This is sometimes called ‘wood worm’.  You will see tiny holes in the wood, and if it is live you will find fresh saw dust.   In severe situations this beetle can cause structural damage to roof structures and floors.   It is more likely to simply be an annoyance.   The life-cycle of the beetle can be broken by chemical sprays and these are a cheap and effective treatment option that can be ‘DIY’.   Aerosols can be purchased inexpensive ly from hardware shops.