Reroute pipework buried into other side of a wall...

[jayc89]

I have 22mm hot/cold pipes buried into the opposite side of the bathroom wall, which I now need to relocate, they penetrate through and connect into an old Ideal Trevi unit on the bathroom side of the wall. 

 

I want to extend the pipes by approx. 4m as part of relocating the bathroom, the side of the wall that they're buried into is a bedroom which I really don't want to disturb, and I can't access them from below either. 

 

The only option I can think of is to stick a couple of elbows into where they penetrate through the wall and chase them down the other side of it too, which feels... wrong.

 

Does anyone have any better solutions?

[jayc89]

Or do something like this;

 

 

Blue being the existing pipe, green being the proposed new pipework;

 

Elbow from the existing pipework, chased down the other side of the wall, teed into a length running to where I need it and back through a new hole into the bedroom (from whence it came), this end would be capped off, for now.

 

Once I have access to both sides of the wall below, which I will, eventually. Below the bedroom, I can remove the stop end and use a straight connector to connect the source into the new green pipe, instead of up and through the wall. Then below the bathroom, I can remove the tee for another straight connector, rendering the pipework chased through the wall dead.

 

Is that OTT? Is there a better method?