If unauthorised persons are able to access a building or individual rooms therein, this poses a variety of further threats. Unauthorised persons may cause damage through deliberate acts such as theft or manipulation of information or IT systems or components, but also through unintentional misconduct (e.g. due to a lack of expertise).

In this context, less obvious manipulations can cause far greater damage than direct acts of destruction. Property damage can also result from the very act of unauthorised intrusion, such as when windows and doors are forced open and damaged in the process. Repairing or replacing them usually takes financial resources and time, during which their protective function is limited or non-existent.