Exclusive: A third of suburbs in Sydney and Adelaide are already highly gentrified, and other capitals are on a similar trajectory

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More than a third of Sydney and Adelaide suburbs and a quarter in Brisbane are affordable only to the most wealthy, and Hobart and Melbourne are following a similar path, analysis of census data on income and housing costs has found. Almost half of Darwin suburbs are either at risk or already well on the way to being “gentrified”, with a similar figure in Perth.

Researchers at the Australian Urban Observatory, who created a gentrification index from the data, say many of the areas most at risk of being gentrified are relatively recent greenfield areas in what were once outer suburbs, where many lower income families were able to find affordable housing. These families now run the risk of being displaced even farther afield.