Window vs extraction fan and vinyl vs tiles for wet room flooring

Hi The ventilation fan will not effect by skylight window. Just make sure the fan out of Zone 1 in the bathroom. And IPX6

Personally I’d put vinyl or Evan better altro flooring in a wet room apposed to tiles

If possible vent fan through wall as it may blow back through the roof light! As for flooring all depends on the finish you want. Vinyl if not fitted right can leak around waste and seams. Tiles are better for underfloor heating. Vinyl is easier to change when revamping the room.

Tiles vs Vinyl Tiles are probably 5 times the price as you don't just need to tile the floor, but you need to waterproof the room first. Vinyl is much easier to damage, but obviously easier to change. Vinyl will always feel a bit commercial and add no value to your home whereas installing a quality tiled floor wetroom will look fantastic and make your house more desirable / valuable. It's easy to get a vinyl floor laid by a professional competent installer and if the room is properly prepared from them they'll have it done in a day - catch them during term times as they tend to be flat out refurbishing schools etc when they are empty. A good quality tiled wetroom installer is much harder to find and if they are doing the job right, an average wetroom with shower, toilet, basin and radiator will cost you minimum £8-10k including all materials, fittings and labour and take at least two weeks to complete.