Real estate agents please help! Should I build a Garage even though it would below standard in depth?

I would actually be closing in a carport and putting in a garage door. The roof of the carport is part of the roof of the house so it would be a really big job if I tried to make it deeper. It is 16 ft wide and 19 ft deep. I know it would not be ideal but I think we would at least be able to park a nissan pathfinder in there. Also, if we built a garage it would cover the part of our house that is an obvious add-on. Putting my needs to the side, would it make sense to add the garage from an investment standpoint. I can have it done for about five thousand dollars.