There's no one answer to how often you need to replace your extension cords. It depends on a number of factors, such as how often you use them, what kind of environment they're in, and how well you take care of them. If you have a Best Extension Lead that you use regularly, you'll probably need to replace it sooner than one that you only use occasionally. nnThe same is true if you have an outdoor extension cord that's exposed to the elements. In general, though, most people will need to replace their extension cords every few years. With proper care, you should be able to get a few years of use out of them. But if you start to see signs of wear and tear, such as fraying or cracks in the insulation, it's time to get a new one.