Following the electrification of the MDR's tracks north of Acton Town in 1903, services between Acton Town and central London were electrified on 1 July 1905. In 1910 the station was given its present name.
Between 1931 and 1932 the station was rebuilt, in preparation for the western extension of the Piccadilly Line from Hammersmith. Although the Piccadilly Line has never served the station, its trains run non-stop through the station and the reconstruction was required to enable the addition of two fast tracks for those services to be located between the District Line's stopping service tracks.
The new station was designed by Charles Holden in a modern European style using brick, reinforced concrete and glass. Holden's design was inspired by Alfred Grenander's underground station Krumme Lanke in Berlin. Similar to the station at Arnos Grove that Holden designed for the eastern Piccadilly Line extension, Chiswick Park station features a tall semi-circular ticket hall adjacent to the embankment carrying the tracks. Externally the brick walls of the ticket hall are punctuated with panels of clerestory windows and the structure is capped with a flat concrete slab roof which abuts the cantilevered concrete canopy of the westbound platform. A similar canopy shelters the eastbound platform accessed through the embankment. To make the station's location visible from Chiswick High Road the station was also provided with a square brick tower surmounted by the UNDERGROUND roundel and the station's name.
Immediately to the south of the station entrance, on the other side of the road junction, the tracks of the District Line's Richmond branch cross under the road and about 100 m to the east of the station, the eastbound track crosses under the four District and Piccadilly Line tracks on its way towards Turnham Green station.