Minimum door height required for RV storage garage

You also say you want to build 1,000 square feet over garage. I would caution you to rethink that also. If you have someone who does not do steps well or has other health issues, a second floor living space can be a challenge. Sure you save a little money going up but is it worth it in the long run? Carrying groceries up all the time, up and down for this or that, no thanks.