A report from Quebec's auditor general indicates the decision to build Montreal's two superhospitals as public-private partnerships will cost taxpayers more money.

Renaud Lachance said the government's decision to build the institutions as PPPs was based on false information.

"First the auditor general and his staff say the analysis of the projects at the very beginning contains inaccuracies and when he says that, he is being very polite because one of those inaccuracies is a report on a study that they say showed that public-private partnerships were in fact a better option," said CTV Montreal's Quebec City Bureau Chief John Grant.

"That study was never done. So the government was working on information that didn't even exist when they made their decision."

Lachance said if that study had been done, it would have shown the conventional method financed by the government alone would have been at least $10.4 million cheaper.

According to Lachance's report, the estimated cost overrun of the CHUM and MUHC projects is already at $108.4 million.

The budget for the two hospitals is $5.2 billon.

Treasury Board President Monique Gagnon-Tremblay insisted the government made the right decision.