A favorite among schools and public works facilities, these have rapidly gained popularity with auto dealers as well. They are more complex commercial solar installation projects that may take 8 to 12 weeks to complete. Additional inspections are often required to satisfy state and federal regulations. (It may be prudent to hire your own architect to monitor holes drilled, rebar & concrete use, and steel fabrication throughout the process.) Pre-construction demolition and post-construction patching and painting may also be necessary. While a lack of parking may be inconvenient during construction, employees will appreciate the covered spaces once the project is complete.