These various large black or violet beetles that occasionally wander in from the garden or emerge from under doormats or not a pest and control is rarely necessary.
The larger Ground Beetles can grow up to 25mm long and tend to wander into properties to shelter from the cold.
They are harmless and no treatment is necessary. However, unless you are experiencing a high volume of these in your house then we would suggest doing nothing.
For persistent problems, we would recommend you contact professional pest control company, preferably a member of the IPCA to administer a treatment. A trained professional will have the technical knowledge and access to a range of professional use products and equipment which are not available to the public.