I have had a small wetroom for some time to help with arthritic problems. The room used to be a coke store, and was changed - underfloor heating and proper tiling and heating installed. tt has made a fantastic difference. I now have a shower chair and sit under the hot water, enjoying it. Sorry, I can’t help with prices etc. I contacted a local plumber rather than a specialist wetroom installer. He did exactly what I wanted and I love it.