The long-awaited redevelopment of a major WA hospital is facing a $400 million cost blowout and potential delays, a leaked document reveals.

A project status update for the Peel Health Campus, seen by the ABC, estimates the redevelopment of the Mandurah hospital will cost $558 million, stating the "cost far exceeds the $152 million initially estimated in 2020".

That is more than three times the original price tag, sparking fears the project will hoover up most of the $500 million funding boost for health infrastructure announced on Wednesday.

Shadow Health spokeswoman Libby Mettam described the blowout as "astounding".

"The Peel Health Campus will suck up most of the $500 million the Cook government announced with so much fanfare earlier this week," she said.

"These massive blowouts

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