Balfour Beatty has combined its Balfour Kilpatrick and Haden Young businesses to create the UK's largest M&E firm.
Balfour Beatty Engineering Services will have a revenue of £600m and will offer national coverage.
Balfour Kilpatrick and Haden Young have been operating as separating businesses since they were aquired by Balfour Beatty.
Balfour Beatty managing director John Moore said the firm would focus on healthcare and education, power systems and power project markets.
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