External trade, damage repair, warranty?

Hello,

here is the following hypothetical question: a tiler lays the floor of a bathroom incorrectly. In the meantime, the plumber has come and installed the toilet and sink.

Now the tiler would like to redo the floor, but the toilet and sink would have to be removed again for this. Which company is allowed/required to perform these tasks without losing the warranty on the toilet and sink? Can the tiler commission any random plumber or must the company that did the initial installation be commissioned?

Thanks in advance,

greetz Ecko

Fictitious answer: He does not have to use the plumber who installed it.

Who then assumes the warranty for the dismantled and installed elements? The new plumber? Also 5 years like the one from the [GU]? What about the other trades? The painters would surely have to come again? What about the door frame?

Why fictitious?

Because this incident could possibly be an issue.

but what could the tiler have done wrong?