I was asking the same question the other day to see if my Commer (when I get it) will fit in my single garage.
I have an up and over door and not quite enough height, so I was going to buy a cover for the van to go outside, but I do not like this solution. So, after talking to my carpenter mate and asking him for a price for 2 side hinged doors to replace the up and over, he suggested trying someone like Howdens joinery as they knock them out 'cheap as chips'.
Like these : http://www.topclasscarpentry.com/category/Garage%20Doors/