Probably in the middle years of the 1800s, a substantial three storey extension was built to the south west of the street frontage. This is dated on stylistic grounds from the magnificent two storey stair hall, with its large first floor sash window and sweeping staircase incorporating a highly decorative cast iron balustrade featuring stylised lyres, anthemion or honeysuckle and laurel wreaths. The anthemion pattern is repeated on the dentils of the ceiling cornice with its egg and tongue moulding. The new stairs gave access to the first floor rooms in the north range on the street frontage, while a second set of back stairs further to the south in the extension served all three floors of it.
