Senior OPW figures say the construction works will be completed by the end of this year and then work will commence on a new visitor building at the site in West Tipperary.
The Rock is the second most visitor OPW site after Kilmainham Jail and almost 69 thousand people have visited this site so far this year.
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Spokesperson Frank Shalvey says there's exciting times ahead for the historic attraction.
The Rock is part of the new tourism initiative Ireland’s Ancient East.