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Lets see, I just looked it up in the city I lived in and no. No permit to replace in the same location, but a license is required for people who don't live in the house where the work is being performed. I wasn't remotely qualified to do that especially in less than 18 hours, though. My realtor ended up finding a plumber who could come the next morning.

In my city you can't diy electric without a license if you intend to sell soon. It's a reasonable precaution to prevent shoddy flips. I assume plumbing works the same way. Just installing a toilet might be fine though, it's pretty straightforward.