Commercial solar is a smart move for cutting energy costs, but many businesses aren’t sure if planning permission is needed before getting started. The good news? Most rooftop systems fall under permitted development, meaning no formal application is required. That said, there are exceptions, especially for listed buildings, conservation areas, or systems that alter the look or structure of a property. In this guide, we break down the rules, the red flags to watch for, and how working with an experienced installer makes the process much simpler.