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Google Sketchup is a decent and free drafting program that can do 2D and simple 3D. The 2D reminds me a lot of AutoCAD.
Make sure you talk early and often with your local city/county zoning and inspection authority. I added a 3rd car garage a while back and had to jump through a LOT of hoops, I can imagine a house is far more complicated. Fortunately they were very helpful and used to dealing with homeowners that don't do it every day.
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‘07 Mazda RX8
Past: 911T, 911SC, Carrera, 951s, 955, 996s, 987s, 986s, 997s, BMW 5x, C36, C63, XJR, S8, Maserati Coupe, GT500, etc
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