After many years of activity, history and folklore the castle became uninhabited in the 1960's, and fell into disuse and only housed countless pigeons, and other fowl. Over the next thirty years or so the Irish weather took its toll on the once great structure and caused untold damage. One day in 1985, a man named Peter Pearson, swung by a rope over the moat into the castle grounds. Having an interest in restoring old buildings, he set about trying to get the castle repaired to its former glory. He also discovered that the castle was potentially destined for destruction, which thankfully was prevented from happening. Many individuals and organisations were involved in the early stages including An Taisce, FAS, CYTP, and the Drimnagh and Crumlin community.
The restoration work started in June 1986 and over 200 workers were involved in the repair work, including stonemasons, woodcarvers, metal workers, plasterers, tilers and artists. The restoration of the the roof was inspired by Dunshoughly Castle in Fingal, and was built using Roscommon Oak which is renowned for its great durability and strength. The roof was constructed in the courtyard and was then raised onto the castle at a cost of 50,000 Punts. The floor of the great hall was re-tiled with tiles taken from St Andrews Church, Suffolk Street.
The restoration work was completed in 1991 and was opened to the public by the then President of Ireland Mary Robinson. Since then the castle has hosted banquets, weddings, book launches and many more events. The castle is now maintained by a small group of dedicated FAS workers who keep the castle looking great for future generations to come.