Dundas West Station is situated below Dundas Street West, north of Bloor Street West at Edna Avenue near the Roncesvalles neighbourhood. There is only one entrance to the station - a building located on the west side of Dundas north of Bloor. The station is an intermodal interchange point between streetcars, busses, and a short walking distance away, GO Trains and the UP Express at Bloor Station. Bloor Station sits to the east of the intersection of Dundas Street and Bloor Street, and is around 270 metres away from the subway station. A tunnel connecting the two stations has been proposed for a long time, but is a few years away due to the Crossways mall parking lot which sits directly in between the two. To the east (Lansdowne Station) the tracks run in twin bored tunnels. The Line 2 standard cut and cover method was changed to bored for this portion between Dundas West and Lansdowne in order to not disrupt service on GO Transit's Weston Subdivision and Newmarket Subdivision, two busy rail corridors. To the west, the tracks rise above ground to Keele Station passing over parking lots on an elevated guideway. To the south of this above ground portion is the TTC's Vincent Yard.
The station sits on the southeast corner of the Junction neighbourhood, next to a few highrise but mostly mid rise buildings along Bloor and Dundas. According to the 2018 TTC passenger numbers, Dundas West saw 27,540 daily passengers. This number comes mainly from the high number of transfers from the terminating streetcar and bus routes at the station.
Being opened in 1966 along with the rest of the original Bloor-Danforth line, the station shares the same design as the stations between Keele and Woodbine. The building is brick and concrete, connecting to the streetcar and bus terminal on ground level. A concrete overhang covers the streetcar and bus terminal providing a crude roof over the central platform (the platform for the 505 Dundas streetcar is separate from the central platform and not underneath the concrete roof as it was constructed after the original central bus and streetcar terminal). The interior of the station is built to the same design as most stations on Line 2, subway tiles matching a per-station unique colour scheme, for Dundas West, it's white and teal.
The layout of the station is very simple. On the ground level, the single entrance leads straight through into the fare-paid bus and streetcar terminal, with stairs down to the right leading one level down to the central concourse above the two side platforms. The central concourse leads to both the eastbound and westbound platforms marked "Eastbound to Kennedy" and "Westbound to Kipling". There is another set of stairs and an escalator leading up to the middle of the streetcar and bus terminal.
Dundas West is located next to the underground tunnels of Keele Yard, and because of this, the station is home to the Subway Track Maintenance Office, which is accessed through a door on the stairs to the Westbound platform. Keele Yard (formerly known as Vincent Yard) is usually used to house four subway trains each night, and workcars during the day. Activity at the yard is usually in the early morning when trains arrive and workcars leave.