The €150m contract, which has been awarded to a consortium of Züblin and Hochtief, covers the construction of the 2km underground section of the branch, which will run in twin-bore tunnels, and the construction and fitting out of the station at Nordhavn.
Construction is due to start at the end of this year and the completed tunnels will be handed over to Metroselskabet in 2019.
Metroselskabet says Ansaldo STS will be responsible for installation of railway equipment on the extension.
The Nordhavn branch will operate as part of the future Line M4.
