The firm reported its order book now stands at £2.6bn, helped by the £400m London Bridge Station rebuilding job awarded last week.
As well as including in excess of £600m revenue for next year, the order book also provides good long-term visibility with over £1.8bn of revenue secured for 2013 and beyond, Costain said in a trading statement this morning.
The engineering and construction contractor said it continued to have strong preferred bidder positions, which has been maintained at around £400m.
Integration of recently-bought contracting businesses Promanex and Clerk Maxwell is going ahead to plan as part of a strategy to establish a stronger position in the power, pretrochemicals and nuclear sectors.
Andrew Wyllie, Costain chief executive, said: “While challenging market conditions are set to continue for the foreseeable future, the board expects to report results for the year in line with its expectations.”