The Wembley stadium legal row with Multiplex has blown a £18.3m hole in the accounts of steelwork contractor Cleveland Bridge UK.

In the year ended 31 December 2007, the company wrote down the value of the contract by £11m and took a hit of £7.3m in legal costs.

The dispute drove the company £17.7m into the red compared with a pre-tax profit of £155,000 in 2006.

Turnover was £26m after the exceptional £11m contract writedown.

The Wembley dispute centred on Cleveland Bridge UK’s (CBUK) £60m subcontract for steelwork, including the stadium’s arch. The company was found to be in breach of contract for walking off the project in 2004 following a dispute over payment.

In September, at a hearing that had been expected to conclude the four-year battle, Judge Jackson ruled that CBUK owed Multiplex £6.15m in damages for breach of contract, overpayments and interest. Multiplex had been seeking up to £25m.

Despite a warning from Jackson that the parties had “cycled over the edge of a precipice into an abyss” by continuing to fight each other in the courts, it is understood that CBUK is appealing up to five points in the judgment.

The photocopying bill for the trial was revealed to be £1m earlier this year.