Costain Group

Costain Group plc is a UK infrastructure engineering and construction company founded in 1865 and listed on the London Stock Exchange. It employs more than 3,500 people and reported annual revenue of £1,251.1 million. The company operates exclusively in the United Kingdom, delivering connected and sustainable infrastructure solutions across critical markets, combining engineering expertise with digital innovation.

Costain's work spans the roads, rail, integrated transport, energy, water, defence and nuclear energy sectors. Notable projects include the construction of the Channel Tunnel, the baggage infrastructure for Heathrow Terminal 2 and the Strategic Pipeline Alliance delivered for Anglian Water. Its activities sit within heavily regulated UK markets, encompassing long-term alliance contracting, major public and private procurement, and infrastructure programmes tied to the country's net zero and climate resilience ambitions.

As a listed plc, Costain is subject to the corporate governance, disclosure and reporting obligations that apply to companies quoted on the London Stock Exchange. The company states a purpose of improving people's lives through infrastructure and protecting the planet for future generations, with a social value target of improving a million lives by 2030 alongside commitments to sustainability, net zero emissions and climate resilience.