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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.
Do you have to have an extractor fan in a bathroom with a website? Bathroom has no issue with damp at the moment. Builder says we need one in there but it's quite pricey when you factor in the electrics.