> Enrich.chat gives AI agents verified work emails and mobiles. To use it from an agent, read https://enrich.chat/agents.md . This is the Markdown version of https://enrich.chat/company/costain-group/ # Costain Group A civil engineering organization with 10,000 to 25,000 employees. Where it sits among its peers, the technology it runs and how to reach its people. By Enrich.chat Editorial. Updated October 21, 2026. **Short answer:** Costain Group (costain.com) is a civil engineering organization with 10,000 to 25,000 employees. Its public technology footprint includes Microsoft Outlook, Cloudflare, Cloudflare DNS and Mimecast. ## How big is Costain Group? Costain Group has 10,000 to 25,000 employees. Among the civil engineering firms on this site it sits in the larger half. Each dot in the figure is one of its peers, placed by size; the orange dot is Costain Group. **Figure: Where Costain Group sits among civil engineering firms.** A strip of dots, one for each of 66 peers in civil engineering, spread from 2,000 to 2,000,000 employees on a log scale. Costain Group is highlighted and falls in the 10,000 to 25,000 employees range in the larger half. *Peers in civil engineering placed by employee count on a log scale. Sizes are rounded ranges from public profiles.* Headcount on public company profiles is rounded and moves as a company hires, so use the range as a guide, not as a payroll figure. ## Where is Costain Group headquartered? Costain Group is headquartered in London, United Kingdom. [Companies in the United Kingdom](https://enrich.chat/companies-in/united-kingdom/) ## What industry is Costain Group in? Costain Group works in [civil engineering](https://enrich.chat/industries/civil-engineering/). This group covers firms that design and oversee roads, bridges, water systems and other public and private infrastructure. Similar organizations on this site: [UEM Group Berhad](https://enrich.chat/company/uem-group-berhad/), [GHD](https://enrich.chat/company/ghd/), [MRV](https://enrich.chat/company/mrv/), [Murphy](https://enrich.chat/company/murphy/), [SACYR](https://enrich.chat/company/sacyr/) and [Epiroc](https://enrich.chat/company/epiroc/). ## What technology does Costain Group use? We detect 4 tools on Costain Group's public footprint across 2 categories, for example Microsoft Outlook for email and productivity and Cloudflare for cdn and security. The figure counts the tools in each category; the groups below name them and link to the companies that use each one. ### Email and productivity [Microsoft Outlook](https://enrich.chat/companies-using/microsoft-outlook/) ### CDN and security [Cloudflare](https://enrich.chat/companies-using/cloudflare/)[Cloudflare DNS](https://enrich.chat/companies-using/cloudflare-dns/)[Mimecast](https://enrich.chat/companies-using/mimecast/) Tools change as companies adopt and drop them. Check a single company at any time with the free [tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/). ## How do I find the right people at Costain Group? Start from the website, costain.com. Enter it in the free email finder with a name, or ask your AI agent for the people in the roles you sell to, such as principals, project directors and heads of business development. ```text Use www.enrich.chat to find the principals, project directors and heads of business development at costain.com, with titles and verified work emails ``` Staff addresses follow a known pattern: see the [Costain Group email format](https://enrich.chat/email-format/costain-group/). ## Which other companies use the same tools? See who else runs the tools Costain Group uses: [Microsoft Outlook](https://enrich.chat/companies-using/microsoft-outlook/)[Cloudflare](https://enrich.chat/companies-using/cloudflare/)[Cloudflare DNS](https://enrich.chat/companies-using/cloudflare-dns/)[Mimecast](https://enrich.chat/companies-using/mimecast/) ## Which industry code is Costain Group filed under? Public profiles list Costain Group under [NAICS 211120](https://enrich.chat/naics/211120/), Crude Petroleum Extraction. Open the code to see the other companies filed under it, where they are based and how big they are. ## Frequently asked questions ### How many employees does Costain Group have? Costain Group is in the 10,000 to 25,000 employees range on its public company profile. Headcounts are rounded and change as companies hire, so treat the range as a guide. ### What industry is Costain Group in? Costain Group works in civil engineering. This group covers firms that design and oversee roads, bridges, water systems and other public and private infrastructure. ### What technology does Costain Group use? Tools detected on its public footprint include Microsoft Outlook, Cloudflare, Cloudflare DNS and Mimecast, across 2 categories. A detected tool shows it was seen, not what Costain Group pays for it. ### Where is Costain Group headquartered? Costain Group is headquartered in London, United Kingdom. ### What is the website of Costain Group? Costain Group's website is costain.com. Staff email usually uses a domain like it, so check the pattern with the free email format finder before you write to anyone. ## Try this prompt Find people at Costain Group ```text Use www.enrich.chat to find the principals, project directors and heads of business development at costain.com, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [UEM Group Berhad](https://enrich.chat/company/uem-group-berhad/) - [GHD](https://enrich.chat/company/ghd/) - [MRV](https://enrich.chat/company/mrv/) - [Murphy](https://enrich.chat/company/murphy/) - [SACYR](https://enrich.chat/company/sacyr/) - [Epiroc](https://enrich.chat/company/epiroc/) - [Amey](https://enrich.chat/company/amey/) - [Ramboll](https://enrich.chat/company/ramboll/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)