7, Hanover Street

7 Hanover Street is a shop, showroom, and workshop/office building designed by Treadwell and Martin in 1907, as indicated by the inscription on the first floor. The structure is made of rendered brick with a roof concealed behind lead flashings. It stands five storeys tall with a basement and is one bay wide, topped by a broad broken pediment featuring keystones above a Diocletian window. A projecting cornice is located below, while the second and third floors present a unified design that includes an oriel window set between Corinthian pilasters. The area between the two windows is adorned with swags of fruit and putti, with the inscription "Treadwell and Martin 1907" positioned to the right.

The first floor showroom features a segmental arched timber window, with a timber window in the shopfront below and a side entrance door. The panelling from the side entrance is echoed internally in the staircase hall, where a timber stair with thick square newels ascends from the ground to the fifth floor. Some cornices remain in the principal rooms.

Henry John Treadwell and Leonard Martin were notable designers of offices and public houses in London around 1900. Alastair Service describes their work as having "inventive brilliance" derived from the Gothic style, blended with other influences and marked by originality. This building exemplifies their classical approach and showcases their talent for designing narrow, tall structures, particularly in the garment district near Oxford Circus. It represents a successful effort to introduce a fresh, light-hearted architectural style to central London, suitable for the rapidly growing retail industry, and is a complete example of the distinctive work produced by one of the leading commercial practices of the time.