The Scottish Parliament's most senior official has admitted that he considered resigning over the building cost controversy.
Paul Grice said the cost was "devastating"
The chief executive, Paul Grice, told MSPs that he had considered his position on a number of occasions.
He told the parliament's finance committee that there had been a "devastating" increase in the cost of the building.
Mr Grice said that after reflecting on the controversy he concluded he had done nothing to warrant resignation and his departure would not have helped the controversial project.
The end of the year represents a slip of one month overall on the projection given in January
He said: "Of course I consider my position when such bad pieces of news come up but I honestly don't think we did or failed to do something of such magnitude."
"The other point to consider is, going forward from this, would my stepping aside help or hinder matters and again I think it is actually for the corporate body and others to judge.
"Nobody's indispensable but I honestly believe that stepping aside at this stage would actually hamper the project."
The finance committee also heard that the building may not be ready until at least the end of the year - a month later than the last estimated completion date.
The disclosure came from Lib Dem MSP Robert Brown, a member of the Scottish Parliament Corporate Body.
Mr Brown was appearing before the committee along with Mr Grice and the director of the Holyrood project, Sarah Davidson.
The meeting follows uproar over the revelation of a further price hike in the project - up by £37m to £375m.
Mr Brown said construction firm Bovis informed him that another delay was likely.
He said: "Bovis currently predict with 95% confidence that the building will be completed by the end of the year.
"The end of the year represents a slip of one month overall on the projection given in January, although November 2003 remains both the target and a possibility."
The project has been beset by delays and spiralling costs
He told MSPs: "Finally there remain two key questions - when will the building be finished and what will the final cost be?
"We have said at every meeting of the finance committee that we cannot give guarantees. I am afraid the complexity of the building means this is still the case."
Holyrood project director Sarah Davidson said fears were raised in April that the final cost could rise again.
She said it "became clear" that because of further delays, Bovis would have to produce a new programme for contractors.
Fergus Ewing, SNP MSP for Inverness East, Nairn and Lochaber, said: "Was it not obvious to the members of the progress group then that there would be an increase beyond £338m?"
John Home Robertson, convener of the progress group, said it did not feel "alarm bells were being sounded".
Meanwhile, a spokesman for First Minister Jack McConnell said he did not know about the rising costs prior to this year's election.
The spokesman said: "The first that he knew about it was the day before it became public."
John Swinburne, of Scotland's Senior Citizens' Unity Party, told the companies involved that taxpayers had been "ripped-off".
He said: "This is the best money making scheme that's ever been devolved."