New Ensuite Layout Idea Problems

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3 Jan 2026
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Hi all

I've been lurking for a while and using various existing threads to help me rip out my existing ensuite and for other minor DIY tasks. Previous ensuite had rotten floor due to leaks and the entire floor squeaked due to chipboard being nailed to joists - the squeaking even went to the hall as the chipboard floor went from the hall to the ensuite. So thanks for the knowledge found on this forum as I've fixed the squeaking floor and managed to remove the entire bathroom myself which has obviously saved a lot of cost!

Anyway...

I'm now down to just to just a shell of a room, and rather than put everything back in the same place, I want to rearrange things so I can have a bigger (and walk-in) shower! I've measured everything out and used wooden batons and floor protectors to template everything and it all seems like it'll work.

My only problem now appears to be whether I can reroute the plumbing properly.

Below is a diagram of what I'm planning, and a picture of how the room currently looks.

1767455717741.png


ensuite-sink-waste-pipe.png


The biggest problem I can see is: How can I run the new sink waste pipe to the existing soil stack? Ideally I don't want to run it along the left-hand and back wall as I think I'd lose room space by having to box-in the walls slightly to allow room for the 32mm sink waste pipe. But I also can't see how I can run it under the floor especially with the copper pipes running directly thru the room (circled in red)

Any ideas gratefully received, also if there's any other potential problems or advice anyone could give me I would be very grateful.
thanks in advance!
 

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