The firm is being parachuted in to replace Kier, which has been carrying out enabling works after signing a pre-construction services agreement over a year ago.
Kier will now complete site preparation works for the 180,000 sq ft complex, which is to be built on a sports pitch on the western edge of the Broomhill campus.
The project was delayed by nearly a year after a University spending review. Following the delay, Kier has failed to agree on a final contract price with the University.
Initially, the scheme was expected to cost around £50m but that has soared to £65m.
The two-year project will unite three departments – economics, politics and sociology – as a ‘hub’ under one roof.
Currently the Social Sciences estate is spread across 19 different buildings across campus.