Alan,
I asked the exact same question about a year ago, here is what I found:
If you go to the Architect that designed your home, they will ask for $250 or more for paper copies, they will NOT give or sell you digital copies.
If you are in Sumter county, you can call Sumter county, and they will send you(by e=mail) the plans that were registered with the county for FREE, NOTE these will be in PDF format.
Finally, you can get a PDF to vector conversion program (I found one) that allowed my to import the PDF into my CAD package. This allows me to play with designs for a future Birdcage on the computer.
I hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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