Why does moving a shower or relocating plumbing add so much to a bathroom remodel?

“Plumbing relocation is one of the biggest cost drivers in a bathroom remodel because it touches framing, subfloor, and sometimes the room below. Keeping fixtures in their existing footprint costs less than reconfiguring the layout. Sebring reviews this tradeoff with you early, before the proposal is finalized, so the decision is yours to make.”