A blueprint is a set of construction or working drawings that define all the construction specifications of a residential house such as dimensions, materials, layouts, installation methods and techniques. Site plans are drawn to show the location of a home on the property in its context. It is an overhead view of the construction site and the home as it sits in reference to the boundaries of the lot. Site plans should outline location of utility services, setback requirements, easements, location of driveways and walkways, and sometimes even topographical data that specifies the slope of the terrain. A floor plan is an overhead view of the completed house. You'll see parallel lines that scale at whatever width the walls are required to be. Dimensions are usually drawn between the walls to specify room sizes and wall lengths. Floor plans will also indicate rooms, all the doors and windows and any built-in elements, such as plumbing fixtures and cabinets, water heaters and furnaces, etc. Floor plans will include notes to specify finishes, construction methods, or symbols for electrical items.