4, Harley Street

This is a four-storey-and-basement terrace house, built around 1817 with later 19th-century alterations. It is constructed of limestone ashlar to the front, with rubble and render to the rear. The roof is parapeted with Welsh slate, featuring two ashlar chimneys – one on the right party wall and another at the rear, which retains some early clay pots. A staircase is located at the rear.

The front has a single-window range. The first floor has a two-paned sash window in a plain reveal with a stone sill. The second floor has a similar sash window. The third floor has a three-paned sash window, similarly set, with a timber lintel on the right side. The ground floor features a six-panel door with reeded and fielded panels and a fanlight, recessed within a shallow, round-headed surround. A two-paned sash window is in a plain reveal, partially above ground level, on the right side of the basement. The building incorporates a plinth, a band course above the ground floor, a lintel, a moulded cornice above the second floor, and a coped parapet at the eaves. The rear elevation includes two-paned and four-paned sash windows, two three-paned sashes to the second floor, and a small ashlar extension.

The interior has not been inspected. The plot was conveyed in 1790 as part of the land on which St James's Square and surrounding streets were built. It remained undeveloped until 1817, when Manners' New and Correct Plan of Bath showed houses on the sites of numbers 3 to 6 and Portland Chapel opposite.