My shop is 30x40 with 10' sidewalls. Yes, it filled up quickly, but I still don't think I would have gone bigger if I had it to do over again. I might have gone with 12' sidewalls so I could put in a lift. If you put in two big doors, it will be easier to get stuff in and out, but you will lose a lot of wall space. Because of where my shop is located, I could only put in one door. It's sometimes a problem to get stuff in and out, but it's not that big of a deal. How high are your sidewalls, and how high will your doors be? Overhead doors normally need at least a foot of overhead, plus another foot for the opener. Which means 8 feet is about it in a 10' sidewall building. A sliding door needs no overhead, so you can have a 10' tall door in the end of a 10' sidewall building. (You can't get a full height slider in the side of pole barn because you lose a foot to the headers.) I put my entry door in the end of the building so I don't get soaked when it's raining. (No gutters to clean.) I put it on to the right of the overhead door (as you face the building) so if I'm pulling a vehicle in I don't have to walk to the other side of the vehicle to get to the entry door. Coincidentally the door is at the corner closest to the house. I put in a 16' wide by 8' tall overhead door exactly in the center of the end of the building. I definitely would not go with a narrower door. You want to be able to get in and out when there's a disabled vehicle in the building. Good luck.
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