You need to convert PDF or Sketch to CAD? Or you already have a 2D which you would like to have a full 3D model of the building? Or you have a set of 2D MEP-Documents which you need to visualize in the architectrural model? I could help you and accomplish the task as precise and quickly as you need. I use different CAD software such as AutoCAD, ArchiCAD, Autodesk Revit, Vectorworks and SketchUp. For each case I could advice you the solution to get maximum from the digital file you become.