Laing O’Rourke is consulting with UK staff on proposals for 200 redundancies.
The job cuts will hit support functions and the firm’s regional office network.
The contractor said the cuts were part of a plan to establish a more competitive business structure and there would be no impact on client service levels.
A statement said: “Laing O’Rourke today announced it is consulting with UK-based employees on a proposal to establish a more competitive business structure across its UK operation, ensuring its project delivery teams are supported by a leaner and more operationally-focused functional overhead.”
In January the company announced it is to sell its Australian business to focus on growth in the UK and Europe.