The house designed by the architectural historian Charles Jencks with some of the leading architects and artists of the second half of the 20th century will open to the public in September, it has been confirmed.

The Cosmic House in Holland Park is considered a post-modern masterpiece. It was the UK’s only grade I-listed post-war home before John Outram’s 1980s The New House at Wadhurst, East Sussex, was added to Historic England’s register last year.

The conversion of the Victorian stucco villa into what was originally known as Thematic House, was a collaboration begun in 1978 by Jencks and his late wife Maggie Jencks, co-founders of the Maggie’s cancer centres.

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