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The construction modifications alone could be cost prohibitive. We remodeled our home several years ago (2007) and in the process we had our master closet made into a safe room with reinforced concrete walls and ceiling and steel secondary door. The room is 8'x10' and these added about 22k to the renovation cost. I say this to give you an example of the projected cost involved in converting your garage. This doesn't even begin to address the range ventilation that would be required.