-
just had my bathroom done (12m²) and the cost was about over £10.5k for labour and parts
That was for a full rip out, moving pipes, new waste, tiles 3/4 up the wall and new plaster above that. Timber frame to square off walls, hide pipes etc. Included new bath, shower, sink, tiles, toilet, radiator etc etc.
Disposal of all waste included and finished to a very high standard of work
Alarm bells. Get a bunch of proper bathroom fitters to look at it. Get on your local groups and ask around for fitters and recommendations.