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There is a 20% risk that Crossrail will bust its newly approved 拢17.6bn budget, an independent review of the project by KPMG has found.

In December it was announced that KPMG鈥檚 review had found that between 拢1.6bn and 拢2bn was needed to complete work on the project.

But the report, which was commissioned by the project鈥檚 joint sponsors Transport for London and the Department for Transport last September and  (25 January), has now revealed that there is only an 80% likelihood that the project will be completed within the top end of that price range.

KPMG said that the 20% chance of a budget blow out would be increased if there was further timeline slippages.

The review said: 鈥淚n the event the stage three [the central section of the line] opening date were to slip materially later than [date redacted] there is a significantly reduced likelihood that costs will be contained.鈥�

The review also revealed that the scheme is currently spending 拢30m a week as contractors race to finish.

KPMG said while software testing was the critical timeline to opening the railway, the main cost was the ongoing construction of infrastructure, particularly the fit-out of the late-running stations.

Earlier this month Crossrail chief executive Mark Wild revealed none of the stations would have been ready to open in December.

The review said: 鈥淒emobilisation of main contractor and supply chain resources must be achieved to reduce significantly the current expenditure rate of approaching 拢30m per week.

鈥淒ates for contractor demobilisation are identified as key dates in the RAP [remedial action plan] but are not contractual requirements.鈥�

It said that achievable progress by contractors and their supply chains in completing the key activities 鈥渞emains a key uncertainty鈥� when forecasting actual construction costs.