Costain has bought professional services consultancy Rhead Group for £36M.
The contractor said the acquisition would boost its programme management and advisory capability.
Coventry-based Rhead Group has more than 550 employees and posted revenue of £63.5M for the 12 months to 31 July 2014.
Costain chief executive Andrew Wyllie (pictured) said: “We are delighted to announce the acquisition of Rhead Group, which has a well-established reputation for its collaborative approach, focus on innovation and service delivery excellence.
“This transaction accelerates the development of Costain and further broadens our range of capabilities to meet the requirements of major blue chip customers, providing greater ability to deliver integrated solutions across the full lifecycle of a project.”
Rhead Group’s customers include National Grid, Wales & West Utilities and BAE Systems.
Costain said the consultancy would be fully integrated by the end of this financial year. It will join Costain’s power sector, reporting into its natural resources division.
Rhead Group chief executive Nigel Curry and his senior management team will remain with the business.
In a separate development, Costain is combining all its nuclear activities into one unit that will report into its infrastructure division.