Replacing vinyl wetroom floor with tiles

ldk_69

Hi,
We have a wetroom that was built for the previous owner four years ago. They used vinyl with a non-slip surface to cover the floor. (I assume it was because the previous owner was a wheelchair user, and the floor had to meet such regulations.) Anyway, this rough, non-slip vinyl surface is a nightmare to clean! So, we'd like to get rid of it and have the floor tiled. The floor is approximately 2x3.5 meters. One of the quotes we got was £4,400, not including tiles, trims and grout. Is this reasonable?
Is this a job that really requires a total replacement of the floor (new wetroom shower tray, new wastes, new pipework, plywood floor, removing toilet, radiatior, etc.)? Or is it much simpler than that, and a tiler could do it?
Thank you for any thoughts in adavance.

andyhop

Yes, full floor removal, walls should also be tanked and all joints overlapped

Vinyl wetroom don’t generally use any tanking since the vinyl is rolled up the wall and the edges welded