The South Australian government's three costliest hospital projects, headlined by the $3.2 billion new Women's and Children's Hospital, have all had "delays in starting construction", the state's auditor-general says — but the government maintains all three projects are on schedule.

The two other projects — the Flinders Medical Centre expansion and new Mount Barker Hospital — have already reported cost blowouts of $96 million and $146 million respectively.

The blowouts take their total projected final costs to $496 million and $366 million.

Health Minister Chris Picton said the three projects "are all on track and there is no delay to their scheduled completion dates".

According to the auditor-general's annual report tabled in parliament earlier this month, SA Health underspent its inv

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