Osborne chief executive David Fison is to retire next month.
The contractor – which works across several civils and non-civils sectors – said Fison would step down at the end of March after more than six years in charge.
He will be replaced by the firm’s construction managing director Andy Steele.
Chairman Andrew Osborne said: “It has been a very great pleasure to have worked with David – his integrity, openness and passion for the business have been an inspiration.
“On behalf of the board and the Osborne team, I would like to thank him for his leadership. He is leaving a much stronger and more vibrant business for us to take forward.”
Osborne added: “Andy’s focus on putting the customer at the heart of our business is at the core of our strategy for the next phase of Osborne’s development.”
Fison said it had been a “privilege” to be chief executive of Osborne.
“Getting through the recession was tough,” he said. “The great thing though is that the company has come through it with a refreshed and stronger commitment to customer service that is delivered by all of our people.”
Steele said: “Osborne is a great business and well positioned for the future, it’s a real honour to be appointed as chief executive and to take over from David who has led the company so well over the last six years.”
John Craig, currently director of education for Osborne Construction, will succeed Steele as managing director of the division.