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Huh, interesting. That's not the case in Australia, in all the houses I've seen. I always thought it was smart, though.

It's very common (maybe even code?) in commercial bathrooms in the US as well.

Not sure if the residential code is lagging, or if it's just not a popular design here.

No floor drains are required in commercial ICC code, but they're a really good idea.

Where I am in Aus, you can either have floor drains (with a specified fall in the floor) or each basin/bath has to have built-in overflow prevention.