3-6, Chiswick Square including railings and paving stones in garden

The building at 3-6 Chiswick Square, including the garden railings and paving stones, dates from around 1740. It is constructed of brown brick with red dressings. The main facade has five windows with flush frames and brick flat arches. The front door features a six-panel design, an architrave, a Roman Doric fluted pilaster with recessed capitals, brackets, and a hood. A brick moulded cornice runs along the top, above a parapet, with three dormers set into the roof, which is slate. Modern additions have been made to the east side of the building. The door hood has been altered.

The interior retains 18th-century panelling and includes an Adam-style room with significant plasterwork on the walls and ceiling, thought to date from around 1775. A plaque claiming that the character Becky Sharp in Thackeray's "Vanity Fair" threw a dictionary from a carriage window in Chiswick Square is inaccurate.

The iron railings and paving stones in the garden are also listed. The listed buildings of Chiswick Square form a unified group.