A croft is a particular type of land tenure, with or without a dwelling. It was only fairly recently that crofters were able to buy their crofts, but the sale of them is controlled. In GH I had Ennis's father buying a croft that adjoined the farm, merging the land with his own, selling his farmhouse and moving into the cottage that had come with the croft.
Well, that would have been next to impossible; for crofts to be decrofted there has to be a good reason for doing so. This isn't one!