Less than 1% of rooms have been completed, out of the target so far.
Just 27 rooms at the National Children's Hospital are done.
The target was 3,000.
The board of the hospital is answering questions at the Oireachtas Health Committee today.
It's told politicians 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.
He said over 2,100 claims, and the "substantiated value as claimed by BAM is €756 million."
The contractor strongly rejected allegations of underperformance and under-resourcing on the project.
BAM says it will submit a revised programme of works for the final stage of building the facility next week.