The £250m turnover regional contractor, which employs around 250 staff across the group, has put 48 jobs at risk at its Birmingham office.
There will also be some job cuts among hourly paid operatives working for the civil engineering business G F Tomlinson and Sons based out of Derby as part of the shake-up.
A company spokesman said: “The G F Tomlinson Group is restructuring its operations and has unfortunately taken the decision to reduce the number of staff at its Birmingham office, which will remain open.
“G F Tomlinson Birmingham Ltd will continue to trade albeit at a reduced level to that previously achieved.”
The firm’s Birmingham office previously benefited from strong work flows from the Birmingham Construction Partnership, where it sat alongside Wates and Thomas Vale.
But this has been superseded by the Construction West Midlands Framework, where places were snapped up by national rivals Mansell, Morgan Sindall, Willmott Dixon and Thomas Vale, now part of Bouygues.