All of the solar systems we install are required to go through a building permitting process administered by the local permitting office. An engineer reviews each system design to make sure the roofing system will support the installation according to proper structural engineering requirements and local building codes. Once the system is installed, the system is then inspected by the local permitting inspector to ensure it was installed according to the original design and can support the system's weight. If you have further questions, please feel free to call in to our Client Resources department at (732) 780-3779 X6138.