Since this person will probably need to be licensed so you get a STAMPED drawing, I suggest you just go to one of the local engineering firms. If you can find out who did the original design of your home, i would use them as they would have the original drawings. i had a similar need, and the Sumter County Building department had a list of suitable firms for the project I was working on, the 17 page report was around $250.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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