When was castle refurbished?

In 1826, major restoration

On 2nd May 1922 occupied by republican forces two days

" By the 1930's the Butlers found that they had to look closely at the viability of maintaining their seat at Kilkenny Castle. In 1935, they decided to leave and a great auction was held in the castle. For five days all the contents of the castle were auctioned off.

In 1967, Arthur Butler, sixth Marquess and twenty-third Earl of Ormonde handed Kilkenny Castle over to the Castle Restoration Committee for the nominal sum of 50.

After treating the fabric of the building for dry rot and wet rot, a phased programme of restoration started. The east wing was re-roofed and opened to the public in 1976. "

http://homepage.tinet.ie/~osrai/kilkenny_castle.htm

What about the destroyed tower? Cromwell

http://en.wikipedia.org/wiki/Kilkenny_Castle, Wikipedia