As a leading smart infrastructure solutions company, Costain is focused on transforming the UK’s critical infrastructure through innovation, collaboration, and sustainability. In response to growing national demands around decarbonisation, digitalisation, and resilience, Costain’s annual report highlights a renewed commitment to integrating technology, consultancy, and complex delivery across the transport, energy, water, and defence sectors. With a strong emphasis on long-term value creation for clients and communities, Costain continues to prioritise safety, operational excellence, and environmental performance—delivering infrastructure that is not only efficient and future-ready, but also socially responsible.