London’s Tate Modern has unveiled plans to transform the gallery with a £215m glass extension.

Designed by architect Herzog & de Meuron, which converted the Bankside power station into the Tate Modern in 1995, the 100 m high building will house several galleries and performance zones, as well as cafes, shops and offices. The consultant on the scheme will be Davis Langdon and the proposals will be subject to planning approval later in the year.