The cost of the report into Mayor Len Brown's extramarital affair with Bevan Chuang has reportedly risen to $250,000.
The Auckland Council is refusing to confirm the figure, but a source has told the Herald that the $250,000 figure is correct.
Former council chief executive Doug McKay said in December the EY (Ernst & Young) report and associated costs would exceed $100,000.
It is understood new chief executive Stephen Town briefed a committee of five counsellors who are negotiating a settlement with Mr Brown towards the bill, about the full costs last week.