10 Cassillis Street, Ayr

8 Cassillis Street is a mid-19th century, two-storey and basement pair of mirrored houses that are part of a terrace. The building is constructed from painted coursed, squared sandstone and features a ground floor band course, eaves course, cornice, blocking course, and painted strip margins. The windows are architraved and corniced at the ground floor.

On the entrance elevation, there is a central stepped platt that oversails the basement. This includes a pilastered, corniced, and block-pedimented double doorpiece with glazed timber doors and letterbox fanlights. Below, there are glazed timber doors aligned with the basement, and above, two single windows are aligned at the first floor. The outer bays have single windows at the basement, ground, and first floors.

The windows are timber sash and case with 10-pane lying pane glazing. The roof is grey slate with rooflights, stone skews, corniced stacks, and both circular and polygonal cans.

The interiors were not seen in 1998. The property is also enhanced by ashlar copes topped with iron railings leading to the stepped platt and basement, along with iron gates on the outer left and right.