Moving shower plumbing

More info needed---where are you--if it freezes in your area --very bad plan.

Are you on a slab or frame construction?

Pictures are nice but not essential.----Mike-----

In northern VA. Not sure if freezing would be a problem. And it's on the second floor (frame construction).

If freezing weather never reaches your house --then using an outside wall is O.K.

I'd probably route the new pipes under the floor to reach the new location---tuck the insulation behind the pipes so the pipes are warmed by the inside wall covering.

Up here we get to many cold spells to ever think about installing any pipe into an outside wall.

Yikes --scary to even think about.---Have fun---Mike---

No freezing in Northern Virginia? You must've just moved there. I'm not far from you in WV, and we routinely have temperatures near or below zero in the winter.