United Kingdom


The Aon Centre, Aon's global operational headquarters, hovers above London's historic streets, housed in the iconic Leadenhall Building.

The glass and steel structure of the Leadenhall Building stands 224m high and has 45 floors. The Aon Centre is situated across ten floors, from the 4th to the 13th plus a dedicated reception on the 1st floor, occupying 190,000 square feet.

The Leadenhall Building is supported by a steel frame rather than the conventional concrete core found in most skyscrapers. 18,000 tonnes of steel has been used in the construction - much more than a concrete core skyscraper.

80% of the building was constructed off-site, using Laing O’Rourke’s Design for Manufacturing and Assemble methodology.

Over 200 designers have worked on the Leadenhall Building. The off-site construction approach meant that meticulous design and millimetre perfect fabrication was essential if the components were to slot into place easily when they arrived on site.

2,475 square metres of landscaped public space has been created at the base of the Leadenhall Building, the biggest open space in the immediate area.

300 miles of cable has been laid in the building – that’s about the same distance as London to Dublin.

At 24 metres, the longest single piece of steel in the megaframe is also the longest load that can be brought into the City of London – lorries were given a police escort and had to arrive between 1am and 5am.

The building holds a Bronze award for Considerate Site Management, ranking among the top 10% of construction sites in the UK for criteria including safety performance, protecting the environment and minimising impact on the public

Aon Centre London