The 75% expansion should be completed by early summer 2015, the firm claimed.
It currently provides over 450t of mushrooms a week to food manufacturers, retailers and foodservice customers.
‘Increase considerably’
Its workforce of 240 was set to “increase considerably” as the firm expanded its operations at the site near Bury St Edmunds, the firm said.
The first mushrooms have also just been picked from a £1M investment in six growing houses at the firm’s Suffolk Farm, which opened in 2010.
The development increased the production at the farm by 33%. The site is heated by a biomass boiler which has helped to significantly reduce carbon emissions, the firm said.
Alan Walsh, chairman, Walsh Mushroom Group, said 2015 would be a “significant year” for the growth of the business.
“Our mushroom growing farm in Suffolk has once again expanded to satisfy customer requirement for locally sourced product,” he said.
“This, coupled with the investment planned at Evesham, clearly demonstrates our commitment to customers, and to our own plans, for significant growth in the UK mushroom market.''
This investment was designed to further strengthen the family-run firm’s position in the UK market with a local produce offer to the major retail distribution centres in the region.
Within a year the site was producing over 50t of high quality mushrooms a week.
10% of UK mushroom market
The Irish firm currently has a group turnover in excess of €75M, accounting for over 10% of the total UK mushroom market.
The group would continue to invest in capital projects, employee training and welfare and the environment to ensure its continued growth was achieved in a rewarding and desirable manner, the firm claimed.
Earlier this year, wild mushroom was voted in the top 10 soups among British consumers as cash-strapped Brits looked to keep both costs and calories down.
Meanwhile, Cambridgeshire mushroom producer Littleport Mushroom Farm was fined £14k after an employee suffered crush injuries when his arm was caught in unguarded machinery.