Key areas of business include buildings, building services, land development and regeneration, traffic and transportation, highways and bridges, railways, environment and process technology, water and wastewater, power, fire engineering and IT and telecommunications.

Until the late 1960s, the Group's activities centred on structural engineering and mechanical and electrical building services.

Major subsidiaries include Frischmann Prabhu founded by Sudhakar Prabhu and based in Mumbai providing expertise in the Asia-Pacific region and Conseco International which focuses on projects in the Middle East and was awarded the Queen's Award for Enterprise in 2006 for work in the reconstruction of Iraq.

It is a 32-storey office building above Tottenham Court Road tube station with 292,563 sq ft (27,180.0 m2) of floor space.

The external columns, load-bearing façade and floors are prefabricated off-site from concrete which was highly polished to give it the appearance of marble or granite.