The garden is due to be designed by Tony Woods, named RHS young designer of the year in 2013 and built by John Lewis’s own gardeners from its Longstock estate.
John Lewis has said the space "will be transformed into a tranquil space that boasts some of the best views in town".
The roof garden will join an interactive exhibition inside the shop with a mock-up of the Victorian draper's shop which started the John Lewis empire in 1864, the office of the founder of the John Lewis Partnership John Spedan Lewis and a WWII-themed installation, in celebrating the growth of the company into a £4 billion international business.Last year the company commissioned a rain garden to replace the concrete area in front of its headquarters in the Victoria area.
The 75sqm garden was designed by Sheffield University's Professor Nigel Dunnett with the Landscape Agency and built by Landform Consultants.
It is part of a concerted effort by Victoria BID to green up the area and act to prevent future flooding. The project attracted a £10,000 grant from the Greater London Authority's Drain London project.