https://www.advancedroofsafety.com.au/services/ladders-compliance-inspection/

There are also many ladders that have been installed well prior to the recent changes to AS 1657. Ladders are commonly implicated in a fall from height and although AS 1657 is not retrospective; a compliance audit and risk assessment should be undertaken to assess whether a ladder installed prior to 1st May 2014 is at risk of causing a fall.