Dean O’Sullivan has stepped into the role of CEO at multinational construction materials manufacturer, Saint-Gobain UK & Ireland, taking over from Mike Chaldecott after more than four decades of service.
O’Sullivan’s appointment coincides with the launch of Lead & Grow, the company’s new five-year strategy aimed at positioning Saint-Gobain as a solutions-focused business across residential, commercial, and infrastructure sectors.
With 25 years’ experience in the construction industry, O’Sullivan has held several senior leadership roles within the Saint-Gobain Group.
He joined in 2007 as a sales manager for Gyproc in Ireland, later becoming sales and marketing director for the combined Gyproc and Isover Ireland businesses.
He went on to lead Saint-Gobain’s UK operations at Okarno (formerly Artex), and then its insulation businesses including Isover.
Since 2021, he has served as managing director of Saint-Gobain’s UK interior solutions division, overseeing brands such as British Gypsum and Isover, where he led a transformation in how the businesses support customers across housing, infrastructure, and retrofit markets.
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He succeeds Chaldecott who retires after 42 years with the group, having progressed from graduate entry to CEO of the UK & Ireland business.
O’Sullivan said: “It’s a great privilege to lead Saint-Gobain’s businesses in the UK & Ireland at a time when we release a new strategy that positions Saint-Gobain as a true solutions provider for customers.
“As the construction sector finds its way of responding to huge challenges such as climate change, protecting natural resources and unprecedented demand for construction – housing, infrastructure, retrofit and repurposing Saint-Gobain has a strong vision for being a catalyst for a transformed construction sector.”
The appointment follows a strong first half of 2025 for the group, which reported record sales of €23.9 billion and operating income of €2.8 billion, with a solid UK performance helping offset weaker results elsewhere in Europe.
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