If there is a managing agent and you are an owner, they are best people to consult; or perhaps ask a neighbour.
A yearly inspection in my experience, unless someone has an alarm going off inadvertently. The sum mentioned seems modest if it covers four visits . Perhaps a typo? Or if fire compliance hasn’t been done for a while, the building may be undergoing a check for the local council as the result of a fire order in view. If you are an owner, it’ may be up to you to look into this more closely.