About 35 Birmingham glass workers have been left without pay for a month after national firm Greenberg collapsed, threatening hundreds of jobs.

The futures of workers at the Greenberg Glass Group’s Birmingham branch at Small Heath Business Park were plunged into uncertainty following the group’s crash into administration.

Around 35 Birmingham employees, including 10 who had been transferred to the Nottingham branch just a month ago, have not been paid for four weeks.

One worker, who asked not to be named, said: “Many employees have been left in limbo awaiting news from the administrators. We have been left unpaid and are yet to be officially informed that we have been made redundant.

“Several people were informed on October 9 that their jobs were safe, only to be later told that administration was imminent.

“All the workers in Birmingham are very dissatisfied with the handling of this by the directors and of the sad closure of the branch at Small Heath.”

The worker said up to 600 employees across 20 offices nationwide had been hit by the group’s collapse.

David Whitehouse, partner at Manchester-based administrators MCR, said: “Increasingly difficult financial and market conditions have contributed to the company’s present situation.

“We will undertake a full analysis of the business to establish how returns to creditors can be maximised.”

Marketing director Beryl Greenberg said: “The directors fought to keep the contracts business going and did everything in their power to save the jobs of loyal and hard-working staff.”

The contracts group supplied external and internal glazing to major commercial and retail developments around the UK.

The Birmingham worker added: “We are not getting paid, and I know of staff in other branches elsewhere who are not getting any money. We are just being kept in the dark, it’s very frustrating.”