Lilleshall Engine House, Kempton Park Pumping Station

Lilleshall Engine House at Kempton Park Pumping Station is a water pumping station built between 1902 and 1905 for the New River Water Company, later taken over by the Metropolitan Water Board. The building is constructed from yellow stock bricks with Portland stone dressings and features a slate roof. It has a rectangular plan and is a single-storey structure with a range of 12 windows. The long façade is divided into three sections by pilasters, topped with a frieze, cornice, and a balustrade that ends at the roofline.

The central porch is lower and similarly designed, featuring round-arched keyed windows, a central doorway with a bracketed segmental canopy, and panelled doors, along with blocked window surrounds. The engine house has tall round-arched windows linked by an impost band, with two-window returns. A notable chimney is attached to the Triple Expansion Engine House.

Inside, the engine house contains electric pumps and is fully tiled, featuring a gantry crane, a panelled entrance lobby with panelled double doors, and a steel truss roof. Historically, this engine house housed five Lilleshall vertical triple expansion engines, two of which pumped water from the River Thames to filter beds, while the other three supplied service reservoirs. At the time, it represented the greatest concentration of pumping power in the country and, along with the 1929 Triple Expansion House, was part of the largest concentration of steam power in Europe. It served as a sister station to Cricklewood, pumping water to its reservoir. The building is graded as part of this outstanding group.