Abstract: A safety barrier system for use in constructing multi-storey buildings has elongated safety barrier panels extending upwards from a first floor level a sufficient height to serve as effective safety barriers during the work for the subsequent floor. The panels are supported at their side edges in rails along which the safety barrier panels can slide. The rails are duplexed (siamesed) so as to link the respective safety barrier panels into a continuous peripheral barrier. The respective panels and rails are braced and independently supported, permitting the system elements to be ‘walked’ piecemeal up the face of a structure as required during its erection. Auxiliary barriers supplement the displaced panels, on lower levels, while toe-boards protect the floor-to-panel gap.