Costain is to occupy all 17,181 sq ft of the 7th floor of 70 St Mary Axe as it increases its presence in the City of London. The move is expected to complete in the second half of 2024.

The office will have capacity for approximately 125 desks, increasing Costain’s existing London capacity by around 400%. The space is being designed to support multiple user experiences, with permanent and hot desks, customer meeting rooms, training areas and informal meeting spaces, with integrated smart technology throughout.

Alex Vaughan, Costain’s chief executive, commented: "This is an exciting new chapter in Costain’s 159-year history and one that points to a bright future. I'm really looking forward to the tremendous opportunities that the new head office will provide to all our people and our customers.

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"Over the last few years, working requirements have changed, with increased co-location with our customers and dynamic working. We need an office that makes it easier for our people, customers and partners to connect, collaborate and create, and our new head office will do just that."

The new office was selected with sustainability in mind, with the building having the highest energy efficiency certification, including a BREEAM Excellent rating, and space for 328 bicycles. Easily accessible from mainline transport hubs, including the Elizabeth Line and London’s Liverpool Street Station, the location will encourage the use of public transport.

As part of the move, Costain will vacate its existing Maidenhead and London offices. The company will maintain a presence in Maidenhead for employees based there and is finalising a suitable location.