Replacing a single cracked floor tile without redoing the whole floor?

This. I had one replaced last year — took the tiler about an hour. Matching was the only hassle; luckily the developer had left spares in the storeroom.

Different scale of job, but related for anyone deciding what to do with a tired floor: if you're thinking of redoing the WHOLE floor rather than swapping one tile, the question becomes tile-over-the-existing vs strip-back-first. There's a thread on whether you can tile over existing tiles — it only works if the old tiles are genuinely sound and you prep the glazed surface, and never in a wet area where the waterproofing needs renewing. Worth reading before you commit to overlay vs strip.

Worth flagging for anyone weighing this up: a single cracked-tile swap and a full tiling job are priced completely differently, and it helps to know what actually drives tiling cost before you compare quotes. A one-tile repair is mostly labour + matching the tile; a whole room is driven by substrate prep, layout complexity, wastage, adhesive/waterproofing spec and cuts — which is why the same room comes back at wildly different numbers. There's a fuller thread on what makes tiling quotes vary and how to compare them fairly. For a single tile, the main gotcha is still matching the exact tile — keep spares.