We've just re-done our peachy nightmare 90's main bathroom and en-suite. Ripped out the fully tiled walls, and redone in half tile. So much brighter and cleaner. I will try to upload some photo's in a bit.
Cost was £25k for both, plus tiles and paint, but including new boiler, tank, pump, flooring, stand alone bath, walk in showers, electric pumped showers, designer cabinets, 2 new and one extra rad, electrics etc etc.
I think that was a pretty good price in things considered.
We never never had mould problems, even without extractor, so don't think it will be a problem now, plus we have installed new up to date extractors which don't let cold air in, unlike our old ones, which we blocked off.