A Byford man died after he fell from the second floor of the dilapidated old South Fremantle Power Station.

It is believed the 24-year-old man was with a woman when he fell 15 metres through a hole in the floor just before 6pm on Saturday night.

Man dies after falling from second floor of the old South Fremantle Power Station. Credit:ABC News Perth

Emergency Services workers provided the man with medical assistance, but he died a short time later at the scene.

Police will prepare a report for the coroner.

The heritage-listed old power station in North Coogee, which has been closed since 1985, is set to be part of a massive commercial and residential development on the Cockburn coast.