Victoria underground station is to undergo a £509m upgrade and redevelopment, the mayor of London has announced

London Underground has appointed Mott MacDonald to be lead consultant for the project, which is part of Transport for London’s £10bn investment programme.

The project is due to start in 2009 and reach completion in 2014.

When complete, the project will increase the size of the station by around 50% with a new ticket hall, lifts and escalators to ease congestion and provide step-free access from street level to Victoria, Circle and District line platforms.

The upgrade of Victoria station is one of several plans by London Underground to ease congestion at stations.

Land Securities is working on plans to regenerate the area around Victoria and will be assisting in delivering the station upgrade.

Underground infrastructure is a significant factor in deciding the location of the two residential towers that LandSecs wants to build in Victoria Street as part of its £1.8bn Victoria Transport Interchange scheme. A planning application is expected to be submitted in early summer.