Where's the best place to fit a fan + window problem

The tiled window ledge probably isn’t an issue as long as the tiling and grout is in good condition and sealed at the edges. However you do absolutely need a fan in there unless you have some other form of mechanical ventilation. It’s more of a pain to cut the tiles when they are on the wall - it’s easy to crack them - but it can still be done if there isn’t an ability to access the ceiling above. I’m not personally a fan of window extractors (pardon the pun!) - they aren’t terribly effective. It’s best to have a proper wall or ceiling fan that also prevents back-draughts.

That’s good and simple solution probably cheaper than others... You need only find window manufacturers and they can prepare glass panel with 100mm hole to put in extractor fan

Even if room is tiled a fan can still be fitted.a 4 -6 inch hole can be drilled to outside .

I’d always add a fan if unsure. They’ll help, especially a timer fan though won’t totally cure the issue I can’t imagine if it’s that bad. They can be either wall or ceiling mounted to leave via a roof vent or a soffit vent so there’s plenty of options if you have access above, but tiles can be core drilled through also, it may just be wise to use some form of surface mounting for the cable so as to avoid damaging tiles further to chase a cable in.

Hi if you getting lots of condensation better to install extract fan anywhere suitable location in bath either on wall or window, hope this will help thanks

I always advise putting a fan on the ceiling near the shower. As it seems to work the best. It's pretty simple if you have a loft above. Otherwise you can core drill a hole from the outside in and gentle pressure once getting close to the tile will cut you a clean hole. But ceiling fan 1st if possible. I'm pretty sure all new bathrooms ex fan is building regs. As condensation normally occurs in the winter when the tiles are colder and people don't open windows to allow the steam to escape because of the cold draft. Ex fan always in bathroom with a shower.