Costain Group PLC

(the "Company")

COSTAIN GROUP PLC SHARESAVE PLAN -

TRANSACTION IN SHARES BY PERSONS DISCHARGING MANAGERIAL RESPONSIBILITY ("PDMR")

This notification is made in accordance with DTR 3.1.4(1).

The Company announces that options to subscribe for ordinary shares with a nominal value of 50 pence each in the capital of the Company have been granted on 28 September 2015 to eligible employees, including the following Executive Directors (each being a "PDMR"), under the Costain Group PLC Sharesave Plan:

The Company was informed of the above transactions on 28 September 2015.

28 September 2015

Enquiries:

Costain Group PLC                                                                                               Tel: 01628 842444
Tracey Wood, Company Secretary