Replacing Car Keys It wasn't too difficult to lose your car keys few years ago. You could visit a hardware store or locksmith to purchase a new key. As cars got more sophisticated, keys became difficult to replace and expensive. Depending on what type of key you own replacing them can range from $150 to $1000. 1. Get the VIN Number https://www.lottiewilcox.uk/the-how-much-does-a-replacement-car-key-cost-uk-awards-the-most-sexiest-worst-and-the-most-bizarre-things-weve-seen/