This Plumbing Layout Plan depicts fixtures, water-supply and waste-disposal lines, equipment, and other sources of supply and disposal. This Plumbing Layout Plan is much easier to understand and is invaluable to those in charge of preparing material estimates and the craftspeople in charge of installing plumbing systems. The first stage of any project is the concept and design. The next step is to create construction drawings when everything is in place. When a floor plan is finished, it is given to the mechanical engineer, who will generate plumbing drawings. The illustrations are added to the construction-drawing set. A set of construction drawings' mechanical division will include, in addition to plumbing plans and details, drawings for any heating, ventilation, and air-conditioning systems that a building may have.