Supporting water needs across southern England

  • Service 1

Southern Water

  • Service 1

AMP4: 2005 to 2010
AMP5: 2010 to 2015

  • Service 1

Asset optimisation and support

Key Benefits

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A safety record at least twice as good as the UK construction average


apprentices and graduates have started their careers with us


nationally-recognised awards for our work in safety, design, construction, innovation, communications and training


raised for 135 charities and deserving causes


project output delivered on – or ahead of – time

Building Strong Relationships

Our strong delivery track record and excellent customer relationships within 4Delivery have enabled us to secure a key role providing continued support and efficiency improvements to Southern Water in Asset Management Period AMP6.

Costain worked as part of a fully integrated alliance with partners Veolia and MWH to prioritise, plan and implement this major programme of work for Southern Water. Our teams of skilled and experienced engineers have delivered 470 projects and £1.35 billion of capital expenditure. The successful delivery of these projects has provided over two million households across Kent, Sussex, Hampshire and the Isle of Wight with wastewater services, with one million people in the same region receiving clean water.

The joint venture will also provide design and build solutions for the development and delivery of Southern Water’s water and wastewater non-infrastructure programme as part of its £3 billion Business Plan for 2015-2020

The work is worth approximately an initial £200 million to the joint venture over the five year period and will see Costain MWH Delivery Partner [CMDP] working collaboratively with Southern Water and other delivery partners to bring together detailed design, construction and commissioning expertise.


Many outstanding people have been recruited and developed by 4Delivery… and this legacy is to the benefit of us all.

Andrew Wyllie, CEO, Costain

Contact and social


Maxine Mayhew, Sector director
01628 842444