"We are already in a construction crisis with a severe shortage of skilled labour," Barattieri di San Pietro told CNBC Friday, adding that a vote to leave the EU would limit the number of workers joining the industry further.
His comments echo those of Chris Blythe, chief executive of industry trade body the Chartered Institute of Building, who wrote in a 2015 report: "Construction has always relied on migration to fill in gaps in the labour market – suddenly cutting off the supply of migrant workers risks seriously damaging the U.K.'s economic prospects."
Migrant workers currently fill around 12 percent of the approximately 2.9 million U.K. construction sector jobs, according to government figures and research by the London School of Economics.
Barattieri di San Pietro predicts a post-Brexit skills shortage that would drive up industry overheads, adding: "Affordable housing margins would be hit worst as labor scarcity causes construction costs to spike, making it much less compelling to build affordable homes - not to mention feasible."
On the other side of the argument, there are many who believe a vote to leave the EU could benefit U.K. builders.
Speaking to CNBC on May 11th Kevin Byrne, founder of Checkatrade.com, said: "We did a survey of our members and asked 'has being a part of the European Union hindered the growth of your business? 20 percent said it's hindered business – that's quite a serious percentage."