Balfour, which has previously warned that it faces major challenges from domestic contracts, said it had discovered problems that would result in an additional shortfall to 2015 pre-tax profit of up to 150 million pounds.
According to Reuters data, analysts had expected 2015 pre-tax profit of 77 million pounds.
Having been hit by wafer-thin margins in its hunt for business during the recession, Balfour had issued five profit warnings within two years, cancelled a 200 million pound share buyback and put its dividend under review in January.
(Reporting by Kate Holton; editing by Paul Sandle)
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