He was arrested and taken to Westmead Hospital with cuts to his hands and head.
Despite the significant damage, a NSW Justice spokeswoman said the court house will open “as normal” on Thursday and no sittings will be impacted.
“Damage to the building is currently being assessed and broken glass panels will be replaced as soon as possible,” she said in a statement.
Extra Sheriff’s officers will be guarding the front of the building due to the damage.
“However, the incident is not being treated as a provoked attack,” the spokeswoman said.