Just 27 rooms at the National Children's Hospital have been completed, out of a target of 3,000.
The board of the hospital has told the Oireachtas Health Committee that the contractor for the build, BAM, has failed to provide a progress report since February.
The National Paediatric Hospital Development Board has added BAM achieved 67% of its planned output levels in the last 12 months.
CEO of the board, David Gunning, says there has been additional cost claims made by BAM:
"2,175 claims have been raised up to the end of June, 2023.
"The substantiated value as claimed by BAM is €756 million.
"The employer's representative has determined 1,487 claims at a value of €14 million, which is less than 2% of the overall contract value".