How to Check Old Bathroom Walls Before Remodel Demo Starts

In older bathroom remodels, the wall almost never matches the neat sketch from the estimate. I learned this on a small job where the vanity wall had old supply lines, abandoned cable, and a patched vent path from a previous owner. If the crew had opened the whole wall quickly, we would have spent the afternoon cleaning up avoidable damage instead of doing planned demo. Now I treat the first hour…