Main Building, Kew Bridge Pumping Station

The Main Building of Kew Bridge Pumping Station is an engine house built between 1836 and 1838 by William Anderson, who was the engineer for the Grand Junction Water Works Company. There were later alterations and a small addition made around 1900. The building is two storeys high and consists of seven by four bays, with a small single-storey addition on the east side that measures two by three bays. It is constructed of silver grey brick, featuring silver Aberdeen granite for the window sills, plinth, doorcase, cornice, and other details. The facade is arranged in a 3:1:3 bay pattern, with a bold central doorcase that has a rusticated surround, a cornice, and a blocking course. The door is panelled and has an overlight with glazing bars. The ground floor has round-headed windows, while the upper floor has square-headed windows, all of which are small-paned with pivoting casements. The building is topped with a cornice and blocking course. To the left of the entrance is a compression cylinder. The right side of the building is similar but partially obscured by an addition made of cream brick, which includes a door, a blind round-arched window, and three round-arched windows. The left side is also obscured by an addition that is listed with the boiler houses.

Inside, the building houses a Boulton and Watt pumping engine from 1820, which was moved here in 1838 from the Grand Junction Water Works at Chelsea, as well as a Cornish Bull Engine from 1859 and other objects from different locations. The extension was built to accommodate an economiser, which is used to preheat water for the boilers.