Who is responsible for the buildings of Parliament?  The Sergeant- at-Arms  is  the  person who is responsible  for  the  Parliament Buildings, their contents, maintenance and security. The Sergeant- at-Arms attends to the Speaker when he or she enters  or  leaves the Commons Chamber, and is responsible for the safekeeping of the Mace. The mace is  a  decorated  rod  carried  as  a  symbol   of Parliamentary authority. Carrying the Mace, the Sergeant-at-Arms escorts  the  Speaker and the Clerks upon their  entry  into  and departure from the Chamber.