The extension would lead to Lewisham, via New Cross Gate and Old Kent Road, with the aim of improving transport links to the south east.
Now the plans have been given a boost after receiving a project funding package last month.
Currently the furthest station on the Bakerloo line is Elephant and Castle, but development could allow passengers to reach Lewisham by tube.
With more exciting news from TfL sharing they are now eyeing a potential second phase, seeing the service expand its reach beyond Lewisham.
See further extension from Lewisham to Ladywell, Catfordbridge, Lower Sydenham, New Beckenham, Beckenham Junction, Clock House, Elmers End, Eden Park, West Wickham and Hayes.
And with stations at New Beckenham, Beckenham Junction, Clock House, Elmers End, Eden Park, West Wickham and Hayes, that means the line would reach Bromley.
Although a borough of London, Bromley has Kentish postcodes and is within historic Kent, but was drawn into suburban London after the growth of the capital.
TfL said: ‘The route would have a frequent Tube service, improving journey times for customers and providing better connections in south east London and central London,’ according to Kent Live.
Should the line extension be given the green light, a new ticket office would be built at Elephant and Castle Station and New Cross Gate.
In 2019, TfL created a report reacting to the extension, with 82% of respondents (73% strongly, 9% moderately) approving of the Hayes extension.