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It's a difficult thing to do. The bathroom can open the window, which will be considered when designing the drawings. The addition of a row of windows may affect the aesthetics and solidity of the building's façade. Most developers won't agree.
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Generally, no, opening a window requires a beam support from above. Holes are made directly in the wall without support.
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This should not be able to apply to the developer, how can this be applied for?
Try the waterproofing effect made by the developer before renovating, if there is no water seepage, then there is no need to redo it.
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Before the wall tiles are pasted, quickly treat the waterproofing facilities before laying the underfloor heating and water pipes.
In this case, you should consult the developer for your opinion - it is impossible for you to encounter such a situation yourself, there should be a unified arrangement!
It's okay, just ask the decoration company to do it again when the time comes, and you generally have to do it again.