Only one record exists to reveal to us if the interior walls of the court house were covered in any way, or if the stone was allowed to show. In the 18th Century, interior walls were often covered with either a coating of plaster or at least a heavy coating of limestone-based whitewash. Less of a decorator concern than a means to prevent insect infestations, the plaster or whitewash would have given the interior walls a crisp, clean look, and would have lightened the generally dark space.
A proposal for the carpentry work included an item listed as 'lathing.' That would have referred to thin strips of wood applied to the walls onto which plaster would then be daubed. It is reasonable to assume that if lathing was used, the walls were plastered. But there are no records to inform us if the walls of the courtroom and jury rooms sported wooden wainscoting or any other decoration.