Dumfries-based R&D went under in April making around 200 staff redundant.
Construction union Ucatt took the firm to an employment tribunal which found against R&D.
Ucatt official Harry Frew said the money would come from the Insolvency Service and was likely to run into a few thousand pounds for each of the workers involved.
He told the BBC: “It was a good decision and I think it was a fair decision.”
Frew added that the money secured would be in addition to redundancy payments made earlier this year.