On a full refit, it’s usually about £1k extra all in. That’s for the former, installation and extra time to tile it.
That’s on a budget Wet Dec though. The likes of Orbrey/Marmox/Jacko etc.
I don’t think there’s any more money in it TBH. Just more headaches. I’ve done my fair share and now try to push people into a level access tray or low profile tray. They are so slim nowadays and colours have started to enter the market.
This is purely talking about the average domestic market on full refits between £7k to £20k