LAING O'Rourke is planning to make up to 300 people redundant in a massive shake-up of its regional operations.
Chairman Ray O'Rourke is believed to have ordered the cuts following a nationwide tour of the firm's offices.
A company source said: 'After O'Rourke bought Laing it became clear there were overlapping operations in different parts of the country.
'Up to 300 people could be made redundant and they will mainly be backroom staff.'
Changes being considered include merging the northern and Scottish operations.
Staff are believed to have been told of the plans. Exact details of the changes will be spelt out in the coming weeks.
Laing O'Rourke declined to comment.