Drawings 24-28 show that extensive alterations were made to the interior of the property on Bridge Street in order to convert it into a bank. Drawing 24 shows the conversion of the basement into storage and domestic rooms, with wine and coal cellars, a porter's room, kitchen (previously on the ground floor viz. drawing 19), scullery and strong room. A new geometrical staircase, extending from the basement to the one pair floor, was built, as well as a staircase leading from the back of the ground floor banking room to the strong room in the basement. The large open warehouse on the ground floor (drawing 25) was transformed into a waiting room and agent's room, whilst the demolition of the partition between the warehouse and counting house created a large banking hall with three counters. A conspicuous exterior addition was the columned porch to the front of the building. The upper floors were converted for domestic use (drawings 26-28).
On all five drawings, sepia wash is used for existing walls, pink wash for alterations and additions, blue wash for outside areas belonging to the premises and yellow wash for wooden fixtures (dresser and counters).