If you already have a 3D CAD file, you can generate 2D floor plans yourself from your design program:
SketchUp
- Open the .skp file in SketchUp.
- Using SketchUp's instructions here, use the slicing plane to slice through the model horizontally: https://help.sketchup.com/en/sketchup/slicing-model-peer-inside
- Go to Camera –> Standard Views –> Top
- Go to Camera –> check "Parallel Projection" instead of Perspective
- Go to Tools –> Dimensions, and then touch the points for which you want measurements displayed. Repeat until you have annotated all the important measurements.
- Take a screenshot or export as a 2D graphic.
Revit
- Open the .rvt file in Revit
- Go to Project Browser and expand the Views tab
- Expand the Floor Plan section under Views
- Double click on the floor plan level you want to display
Chief Architect
- Open the .plan file in Chief Architect.
- Position 2D plan the way you'd like to see it on the page
- Go to File –> Export –> Export Current View and save the drawing as a DWG
2020
- DesignOpen the .kit file in 2020 Design.
- Position 2D plan the way you'd like to see it on the page.
- Go to File –> Export –> Other Formats –> save the drawing as a DWG
- For 2D Plan choose in "Shape Selection" dialog – "Floor plan shapes"
AutoCAD
1. Open the .dwg file in AutoCAD.
2. Hit the top-down button in the top right corner.
3. Annotate the dimensions you need (there are multiple ways to do this in AutoCAD)
4. Go to File –> Export and save the drawing as a PDF.
You can learn more about Scan To CAD's compatibility with various architecture and design programs in general here: What file formats and programs does Scan To CAD export?