The answer to 'when to replace rewiring' is that you should consider rewiring your home every 40-50 years, or sooner if you notice signs of electrical problems. Older homes with knob-and-tube or aluminum wiring should be inspected and may need to be rewired for safety. Rewiring is also recommended if you are planning major renovations or additions to your home.
Rewiring is an important home maintenance task that helps ensure the safety and reliability of your electrical system. Over time, wiring can become worn, damaged, or outdated, increasing the risk of electrical fires or other hazards. Replacing old wiring with modern materials and techniques can improve energy efficiency, add capacity for new appliances and electronics, and give you peace of mind about the condition of your home's electrical system.