The firm has been involved in the electromechanical works within the eight-tower complex. The contract value for the work is estimated at SR500m ($133m).
The project is located within 1,500 metres of the Haram and will be connected with the courtyard through a tunnel.
Mecca is undergoing major redevelopment.
A number of major projects are being developed including the seven-tower $1.6bn Abraj al-Bait, being developed by Saudi Binladin Group and the $2.7bn Jabal Omar development, being developed by the Jabal Omar Development Company.