Cash, who writes and stars in the BBC One comedy with Caroline Aherne, said that the sitcom will be back for another festive one-off.
"We're going to do another episode at Christmas. We think that the characters still have lots of mileage. They are very popular. And my wife wants a new kitchen," he said.
When asked whether they would ever consider writing another full series, he added: "It takes it out of you doing six weeks. And then there's the time it takes to write and edit. I think the public like it as a one-off at Christmas and it seems to work.
"But who knows, we may do a series one time... again."
Recent Royle Family specials 'The New Sofa', 'The Golden Eggcup' and 'Joe's Crackers' have been ratings hits.
Cash and fellow Royle Family star Ralf Little recently reunited for new Sky1 comedy series The Cafe, which will air in the autumn.
Watch Craig Cash talking about The Royle Family below: