He also designed an extension for the British Museum which was also never realised.

The university commissioned Associated Architects who designed a further south extension which was constructed between 1992 and 1993.

He commissioned William Adam to design an extension, which was built in 1740-1741.

After some years the church had become too small and Jensen-Klint was asked to design an extension.

By the late 1980s the collection had outgrown its accommodation, and Norman Foster was asked to design an extension.

In 1908 Plumbe designed an extension to accommodate a further 600 patients.

Alfred Waterhouse was subsequently asked to design a further extension including a new concert hall, museum and library, but this was thought too expensive.

In 2007, David Chipperfield designed an extension, which was then built onto the older building.

He also designed an extension to the Thames clubhouse.

Manuelle Gautrand designed an extension, covering 2700 m2, of which the construction ended in 2010.