The bathroom in the apartment needed the most work. There was plaster damage. The floor was what a friend of mine calls "peel and suck tile" and there were gaps between the tile. The sink was an old wall-hung model with no storage. In a former life, we might have torn the whole thing out.
A more thoughtful assesment showed that, though the floor did need replacing (those gaps would eventually allow water damage to the subfloor), the tub and toilet were sound. Alan did some plaster repair and we painted the whole thing.
We did get a new sink. If our skills were up to it, I'd have opted for building a new cabinet under the existing sink. But we're not that good, yet.
All in all, a "new" bathroom for about half the environmental cost of replacing everything. And, while it's still small, I think it works.