Fletcher Building has delivered grim news of a $180 million dollar hit to accounts on two big projects.

Costs for Auckland's International Convention Centre are up another $165 million, and a Wellington car park's tally has risen $15 million.

The company's half-year results are due out next Wednesday.

Jarden's Grant Swanepoel says this is the fourth concerning financial 'surprise' from Fletcher in the last 13 months.

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