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At a guess, regs say new builds and new installations require active extraction.
Cheers, this is the bit that's not clear. Looks like it's definitely required for new builds but not clear whether just fitting a new bathroom requires it.
It's not my bathroom so the window will be open 24/7 regardless if there's a fan in there.
A fan would be better but with the electrics it's coming in pretty pricey.
aggi
At a guess, regs say new builds and new installations require active extraction.
Personally I’d put one in because a window lets in loads of shitty cold air cooling everything around it and this helps moisture to condense on surfaces rather than drift away.