Around 90 jobs at Sir Robert McAlpine are under threat as the contractor undergoes a regional restructure.
A McAlpine spokesperson said the jobs at risk were “all administrative and managerial roles at head office and regional offices” and “the company was now in consultation with staff, after which the actual number of job cuts would be confirmed”.
The spokesperson added: “Approximately 90 roles are at risk as a result of the changes.
“It is impossible to predict the outcome of the process at this time.”
The changes are expected to be finalised before the end of next month.
As part of the restructuring, the contractor said it was “streamlining” its regional centres, reducing them from six to four.
The Wales and West centre will merge with the North-west, while the Scotland centre will be combined with the North-east.
The Southern and London centres will remain as they are.
McAlpine emphasised it was not pulling out of any regions and that the change would “increase consistency in service delivery and reduce duplication of operations to provide better client value”.
The announcement was made to staff by CEO Paul Hamer (pictured), who was appointed in June, and chairman Gavin McAlpine.
In a statement, the company said: “The changes will enhance both the resilience and agility of the business and create greater ongoing focus on delivering client value through operational and project excellence.
“The changes include the streamlining of the company’s regional operations and the reorganisation of head office and business support functions but do not affect any of its current site and project operations.”
In its last full-year, McAlpine posted a pre-tax loss of £43.2m after writing down the value of its pension scheme. Operating profit came in at £1.3m in the year to 31 October 2016, after suffering an operating loss of £44.4m in the prior year.