PL0 files are Building floor plans that have been created with the use of the 3D Home Architect Deluxe software. 3D Home Architect Deluxe is a commonly used home design program used for the creation of building layout and design. The PL0 file stores the layout of the foundation specifically. The PL0 layout may include physical objects, and also will include the buildings structural foundation. The first level floor plan is stored in a .PL1 file.