How to handle hidden utility lines discovered during old house renovation

If you discover hidden utility lines after opening up walls during an old house renovation, never let the workers cut them first. Stop and take photos, identify whether they are electrical wires, water pipes, gas lines, drainage, or low-voltage cables, and check if they are still in use. When you can't find the source, use a detector or call in a technician to judge; don't guess. If it affects…