Costain has been confirmed as the main contractor for the £120m redevelopment of Gatwick Airport’s railway station.
Network Rail confirmed to Construction News Costain had been awarded the design-and-build contract.
Costain has begun work with Network Rail covering the Grip 3 and 4 development phases of the scheme.
Construction of the project is scheduled to start in 2017, with completion expected in 2020.
Costain is currently the lead contractor on the £400m redevelopment of London Bridge, which last month opened its platforms and new concourse.
The work will include doubling the size of the concourse area and the installation of escalators and lifts to improve platform access.
It comes as demand at the station is forecast to increase by a third to 20 million passengers a year by 2025.
A Network Rail spokesman said: “Given the early stages of the development, it’s not possible to put a cost on the scheme, or a value on Costain’s contract.”
In 2014, the value for the station redesign was listed as £120.5m, with the Department for Transport contributing £50m to the scheme, while Network Rail and Gatwick would pay £30m each.
Recent Costain contract wins have included the last of the major contracts to be awarded by Crossrail.
A joint venture between Costain, Alstom and TSO won the £26m contract for a maintenance facility at Plumstead, which will house the staff and the equipment required for the maintenance of the tracks and other infrastructure in the tunnels.