The Cromwell is an internationally renowned private hospital with a reputation for innovation. Opening in 1981 the hospital was purpose built state-of-the-art. However, the hospital prides itself on being at the forefront and so is continually investing in the worlds' most advanced diagnostic and treatment technologies. This has meant replanning the internal space, necessitating plant and equipment being re-sited on the roof of the building. To accommodate this a new structure was designed on the existing roof to support the new plant and equipment.