How many employees work at Costain Group?

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

About Costain Group

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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Employee Headcount

Interactive chart of Costain Group annual worldwide employee count from 2023 to 2025.

  • Costain Group total number of employees in 2025 was 5,157.888, a 1.3% increase from 2024.
  • Costain Group total number of employees in 2024 was 4,938.72, a 1.0% decline from 2023.
  • Costain Group total number of employees in 2023 was 5,012.383, a 3.3% decline from 2022.

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Employee Geographic Breakdown

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Employee Role Breakdown

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Employee Compensation

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Active Job Postings

Interactive chart of Costain Group annual active job postings from 2023 to 2025.

  • Costain Group active job postings in 2025 was 755, a 7.4% decline from 2024.
  • Costain Group active job postings in 2024 was 710, a 1.0% increase from 2023.
  • Costain Group active job postings in 2023 was 703, a 9.5% decline from 2022.

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Employee Sentiment

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