In general, if you are replacing a door or window without changing the structure of your home, you probably won’t need a permit. If you’re changing a window to a doorway or creating a new door opening, you probably will. Homeowners should check with their local jurisdiction before starting DIY home improvement projects. Infinity Exteriors has decades of experience installing and replacing patio doors across southeast Wisconsin. We’re happy to address any questions or concerns you have about permits for your Infinity Exteriors patio door installation.