How to Plan a Bathroom Remodel Demo Without Breaking Hidden Plumbing

On older bathroom remodels, demo can get expensive fast when the crew assumes the plumbing follows the drawing. I learned this on a small bath where a supply line had been rerouted through a soffit during a past repair. A helper started opening the wall too aggressively and nicked the line. The water was shut off quickly, but the cleanup stole hours. Now I treat demo planning like investigation…