AGM Results

Costain Group PLC
11 May 2007


Costain Group PLC

AGM Results

At the Company's Annual General Meeting held yesterday, each of the resolutions
set out in the Notice of Meeting circulated to shareholders on 12 March 2007 was
passed on a show of hands.  The proxy figures for the resolutions were as
follows:

                                        DISCRETIONARY  TOTAL VOTES       VOTES 
               VOTES FOR  VOTES AGAINST     VOTES         CAST         WITHHELD*

Resolution 1   89,143,554     16,797       504,321      89,664,672      64,467
Resolution 2   81,355,731  7,539,137       518,117      89,412,985     316,154
Resolution 3a  89,059,923     62,753       532,838      89,655,514      73,625
Resolution 3b  84,987,433    125,576       532,773      85,645,782   4,083,357
Resolution 3c  88,663,201    459,555       531,931      89,654,687      74,452
Resolution 4   89,010,959    101,593       563,629      89,676,181      52,958
Resolution 5   88,929,462     58,575       614,273      89,602,310     126,829
Resolution 6   88,791,857    281,774       571,145      89,644,776      84,363
Resolution 7   88,743,238    328,926       572,470      89,644,634      84,505

*Note: A vote withheld is not a vote in law and is not counted in the
calculation of the proportion of votes 'for' and 'against' a resolution.

Copies of the resolutions dealing with special business at the Annual General
Meeting have been submitted to the UK Listing Authority and will shortly be
available for inspection at the UK Listing Authority's Document Viewing Facility
which is situated at the Financial Services Authority, 25 The North Colonnade,
Canary Wharf, London E14 5HS (telephone number 020 7676 1000) during normal
business hours on any weekday (public holidays excepted).

                                                                     11 May 2007

Enquiries:
Costain                                                      Tel: [phone]
Andrew Wyllie, Chief Executive
Tony Bickerstaff, Finance Director
Graham Read, Public Relations

College Hill                                                 Tel: [phone]
Mark Garraway
Matthew Gregorowski



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