No building is ever constructed without a set of building plan drawings, also known as "blueprints".  These are literally the instructions of what is to be built, where everything goes, what materials to be used, and even a timeline as to when each stage of construction will commence and end.  There are many, MANY drawings, however typically the first set of drawings are often known as THE SITE PLAN.  The site plan is a comprehensive detailed drawing of the building representing the whole plan of a building that shows property boundaries and means of access to the site, and nearby structures if they are relevant to the design. For a construction project, the site plan also needs to show all the services connections like drainage and sewer lines, water supply, electrical and communications cables, exterior lighting etc.  It's a first design that is made for any project before going into detailing process (such as elevation, electrical, reflective ceiling, etc).  Drawing up a site plan is a tool for deciding both the site layout and the size and orientation of proposed new buildings. These drawings should comply with the local development codes, including restrictions on historical sites. It acts as a legal agreement for the permission of construction from the government body. For this, it is required that the site plan is made by a licensed professional like architect, engineer, landscape architect or land surveyor.  From the AVL design point of view, the site plan is critically important to specify things such conduits to be installed for pulling of various cabling, electrical requirements for the equipment, etc.   For this reason, some local building codes require these specification from the AVL design engineer to be included in the master plans before permits may be obtained or construction is set to begin.  It's important to know that often the AVL design plans are technically separate from any and all building plans, they are often delivered on-site to be included with the master set of drawings for the general and specialized contractors to follow.  These plans will be provided ahead of time to the AVL integration contractor.  Just as the master building plans have many sets of individual plans, a well-designed AVL system should also have many sets of individual plans.  What they are and how many will depend entirely on the project's scope of work and detail required.