A site consultation is an essential part of designing and quoting a solar PV system to avoid delays and potential cost overruns. The information gathered helps the design engineer to refine the quote as much as possible. It is necessary to have an experienced solar installer or design engineer on-site to identify critical points of interest, such as: shading, site dimensions and layout, existing electrical infrastructure, and identifying the required scope of work specific to each project. Fees are dependent on certain criteria, such as: site location, distance, and the time spent on-site.