Warning arrives as it emerges top 10 firms from mainland Europe won £7.3bn worth of UK contracts in opening third of 2016

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A potential Brexit could deter EU contractors from working in the UK, economists have warned, after it emerged firms from mainland Europe are bidding for British projects worth over £9bn.

According to data provided by Barbour ABI, the 10 biggest contractors in the UK with headquarters elsewhere in the EU won a combined £7.3bn worth of contracts in the UK over the first four months of this year alone.

Seven of these firms - including Amey, part of Spain’s Ferrovial, France’s Bouygues and Sweden’s Skanska - are currently bidding for a combined 71 projects as main contractor, including five packages on HS2 each worth over £1bn.

Michael Dall, lead economist at Barbour ABI, said: “If the referendum is in favour of Brexit, there could be possible ramifications for these 10 companies, alongside other EU-based construction firms who work in the UK.â€

Dall said overseas firms might be more cautious about investing in the UK following Brexit and added: “It could also cause potential issues for big ticket projects such as HS2, who have EU-based companies launching million-pound bids to work on the development.â€

The news comes after engineer Cundall and Tony Giddings, former Argent construction director and now an independent director at T Clarke, became the latest high-profile signatories to Ðǿմ«Ã½â€™s remain in the EU campaign, Ðǿմ«Ã½ Says In, ahead of this month’s referendum.

Ðǿմ«Ã½ has come out in support of staying in the EU, after results of a survey of 1,300 construction professionals last month showed two-thirds’ support for staying in.

Further analysis of our results by turnover and profession found that larger firms were more likely to back remain than SMEs, although 53% of respondents from firms with a turnover under £5m still wanted to remain, compared with 21% in favour of Brexit.

But a survey of 100 members from SME builders’ trade federation the National Federation of Builders has shown that more want to leave the EU than remain.

Some 47% said their business would benefit more from being outside the EU, with only 33% stating remaining would be of greater benefit.