29, Sackville Street W1

29 Sackville Street is a terrace house built around 1731 for William East, with some early to mid-19th century alterations. The building features brown brick and a slate roof, standing three storeys tall with a basement and a dormered mansard. It has three windows across the front. To the right, there is an architraved doorway topped with a cornice supported by consoles. The windows are recessed sash types within architraves and do not have glazing bars. A moulded cornice is present above the second floor, and there is a parapet with coping. Wrought iron balconettes adorn the windows, and there are wrought iron railings around the area.

Inside, the hall is panelled and features an early 19th-century Grecian cornice along with black and white paving. The timber staircase has an open string design with a parallel flight and a handrail that ramps up to columnar newels, accompanied by a marching dado. The rear closet wing includes doorcases and other details. A notable feature on the first floor is the plaster ceiling in the front room, designed by Robert Adam in 1770. This ceiling has a radial pattern but has suffered fire damage, resulting in the loss of much of its filigree work and painting. The original design can be found in the Soane Museum.