The women had their hours cut by an average of 4.5 hours a week by the firm, which took over the contract about four years ago.
Unison claimed the reductions were unlawful and set about challenging Chartwells' action in the court. Lynne Robson, Unison senior regional officer, said it been a lengthy fight which had ended in an out-of-court settlement.
She said: 'These things always take time. It must have seemed to our members they were not going to see a result. But happily they will now receive cash payments in time for Christmas.'
There was no one available at Chartwells to comment on the compensation.