December 1977. The old platforms were demolished and was filled in, creating around 400 car parking spaces. The station today When the Piccadilly line was planned to be extended here, the station was to receive a new station building. Charles Holden, who was part of the Adams, Holden & Pearson architectural practice, designed the exteriors under the supervision of Stanley Heaps on-site. The new building is in a style reminiscent of Holden's designs for the 1926 Morden extension of the City and South London Railway (now part of the Northern line). Basil Ionides designed the interior of the ticket hall. Portland stone was used for the facade, strengthened by a reinforced concrete base. Its front is constructed of granite, while its rear is made of bricks. Glazed screens are fitted onto all sides of the tall heptagonal ticket hall, with an adjoined rectangular shopfront. In addition to its drum shape being heptagonal, its ceiling motif contains this pattern, with a chandelier featuring seven lamps of the same geometry. A wooden ticket booth (known as a passimeter) sits in the middle of the ticket hall, albeit now disused. The building is very similar to the reconstructed station at Ealing Common built at the same time, also by Heaps and Holden. The station is a Grade II listed building. The station has two platforms for the Piccadilly line, located below surface level. Platform 1 is for trains to Heathrow Airport, while Platform 2 is allocated to services bound for Cockfosters. These were built in 1975 together with the steel bridge connected to the ticket hall. As with other stations on the Heathrow extension, artwork was to be installed on the new platforms, with a station motif designed by Tom Eckersley. However the artwork was never installed. The platforms are reached by flights of stairs and a stairlift, which makes the station step-free for manual wheelchair users only. It is also the only London Underground station to be wheelchair accessible for manual wheelchair users only. Future In the late 2010s, the station car park at Hounslow West was proposed by Transport for London (TfL) for property development, as part of TfL's plans to increase the amount of income generated from land in their ownership. , over 400 new affordable homes are currently planned to be built on the current car park at the station by housing association A2Dominion. The proposals also include a