Sutton Station is to get a £1.3m renovation, including opening a currently disused side entrance.
The revamp would also extend the station building itself, installing new barriers, ticket machines, CCTV and lighting and improving other public transport, cycle and pedestrian facilities around the station.
The main part of the project, funded by Transport for London and Sutton Council, is due to start in July next year but work on opening the side access is due to start in December and be complete in March.
Councillor Simon Wales, chairman of the Sutton Gateway Board, which is co-ordinating the project, said: "This is an important scheme that should provide huge benefits to everyone who uses the station.
"The station and the surrounding area will look better and it will be quicker, easier and safer to get in and out, buy tickets and get on a train."
The disused side entrance to Sutton station
Work on the design for the new-look station is underway and the plans are set to go out to public consultation in February.
The station deals with almost six million passengers every year and has been named one of the 18 most congested in London.
A council spokesman said the project would benefit the whole town by creating a more attractive gateway to the town and providing support to local businesses.
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