CCTV footage showed the two men, both in their early thirties, grappling before one pushed the other against the site hoarding, which gave way, leading them to topple head first into the basement of a residential site near Euston Station back in October 2013.
Both men suffered catastrophic head and neck injuries, the Old Bailey was told.
The firm was fined £250,000 each for the deaths as well as £50,000 for the heath and safety breach. It was also ordered to pay £23,653 costs.
Safer Sphere advise, hoardings should alway be a part of your temporary works processes and designed by a competent person.