Director Declaration

Costain Group PLC
("Costain" or the "Company")

Board Notification - External Directorship

Costain has been informed that Jacqueline de Rojas CBE, Non-Executive Director of the Company, has been appointed to the Board of FDM Group (Holdings) plc as a Non-Executive Director with effect from 1 October 2019.

                                                                                                               25 September 2019