If a technician gets hurt during your installation, or if your house gets damaged, you don’t want to be held liable. That’s why it’s important to work with a company that is properly insured. Ideally, your window replacement contractor should have workers’ compensation insurance and property damages insurance. That way, you won’t be held responsible for any accidents that take place during your installation. Make sure you ask for a copy of their certificate of insurance, so you can be 100% sure that you’re not taking on any risk.