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Becoming a supplier

We have a well established structure and operating model for our supply chain management. Our controls ensure we select and appoint the best suppliers who are both responsible and capable of delivering our business needs.

To maintain the right calibre of suppliers within our supply chain, potential suppliers must follow one of two assessment routes.

  • Via the Achilles Building Confidence accreditation scheme. This is our preferred option; however we now accept all recognised Common Assessment Standard (CAS) bodies and their associated accreditation schemes (click here to learn more).
  • Alternatively, via the Costain materials, plant or subcontract pre-qualification questionnaire completed through our Supplier Relationship Management system (SRM).

If your company would like to be considered for inclusion on our supply chain, please contact one of the following people to establish if there is a requirement within our business for the product or service you provide. To assist with this initial assessment please provide some basic details about your company, including your turnover, brief and clear summary of your services, a few examples of projects you have been involved with and your trading location(s).


Subject Email contact
Rail [email protected]
Water [email protected]
Highways [email protected]
Energy [email protected]
Aviation, Defence [email protected]
Design related [email protected]
General plant hire or fleet [email protected]
General materials provision [email protected]
General subcontract [email protected]

Please note:  We kindly ask that you only send emails to the individual(s) that is relevant to your enquiry. If your enquiry has multiple recipients we ask that you send just one email to all individuals and not a separate email to each.