Costain Group Plc has 5,091 employees, according to Revelio Labs workforce intelligence data. The YoY growth rate is 1.3%.
Data source: Revelio Labs Coverage: Global workforce Latest update: September 2025
Costain helps to improve people’s lives by creating connected, sustainable infrastructure that enables people and the planet thrive. We shape, create and deliver pioneering solutions that transform the performance of the infrastructure ecosystem across the UK’s energy, water, transportation and defence markets. We are organised around our customers anticipating and solving their challenges and helping to improve performance. By bringing together our unique mix of construction, consulting and digital experts we engineer and deliver sustainable, efficient and practical solutions. Our ambition is to become a net zero business by 2035, while enhancing biodiversity and natural capital, and we have plans in place to deliver this. We are committed to procure responsibly and to be an inclusive and accessible business for all, enabling us to be our best while focusing on the outcomes that we deliver for people and planet. At Costain, we have a vibrant, challenging and growing business – an environment that provides tremendous opportunities for everybody. We're looking for curious, collaborative and courageous people who'll help transform the performance of the infrastructure ecosystem across the UK. For more information about our careers go to www.costain.com/careers Today, we employ around 3,500 people and are one of the nation’s Top 100 Most Admired companies and have been named in the Times Top Employers for Women 2021.
As of September 2025
Costain Group
workforce metrics
Headcount
5.1k
Avg. Salary
$85.3k
Tenure
4.8yr
Growth Rate
1.3%
Hiring Rate
Attrition Rate
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Interactive chart of Costain Group annual worldwide employee count from 2023 to 2025.
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Interactive chart of Costain Group annual active job postings from 2023 to 2025.
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