18, Castle Street

No. 18 Castle Street is a building in Cirencester that likely started as a house and now serves as offices. The front of the building dates from the late 18th century, while the rear wing suggests possible origins in the 17th century. The exterior features stucco on the front and sides, with an ashlar cornice at the front. The roof of the front range is hipped and made of pantiles, while the rear has stone slates and Welsh slates on the rear wing. There are rebuilt brick stacks on the gablet at the rear and on the gable end of the rear wing.

The building has a three-storey, four-window range. On the first floor, there are four 6/6-pane sash windows with crown glass, set in plain reveals with projecting sills. The second floor features four 3/3-pane sashes with exposed sash-boxes in similar reveals. The ground floor has a wide 19th-century 8/1-pane horned sash window to the left, along with two late 18th-century sashes that have been altered to 6/1-pane with the glazing bars removed from the lower sashes. There is a pair of doors, each with three panels, set in a round-headed opening with a mock fanlight, likely from the 20th century, and plate glass in a moulded stone doorcase with Doric pilasters, a frieze, and a moulded cornice. The building also has a shallow plinth, a band course over the ground and first floors, a moulded stone eaves cornice, and a coped parapet.

The interior has not been inspected but is noted to have late 18th-century panelled shutters, a run cornice in the ground floor front left, and 20th-century internal doors in the ground floor front left.