The percentage of women in top jobs at the biggest architecture firms has doubled over the past five years – but men still occupy four out of five key roles, according to research conducted by Dezeen to mark International Women's Day.

Women now make up 21 per cent of the highest-ranking jobs at the 100 largest architecture firms around the globe.

The figure was just 10 per cent in 2017, when Dezeen published a landmark survey of the gender balance at the world's 100 biggest practices, meaning the proportion has doubled.