Commercial doors are available as a standard up to 24 in width.
Pole barn door height.
Residential doors are available in most heights to 18 wide.
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If you need a 10 foot high opening you can know that 12 foot tall walls will work well for this.
If you need to store an rv motorhome or camper most models require a minimum of 12 clearance to get inside a door.
10 12 14 etc.
The average pickup truck or suv can fit inside an 8 door.
When considering the maximum door height that will be feasible for your building the 2 foot rule is a safe one to follow as well.
Narrower doors can be made special but are more expensive than the 8 width.
Stellar recommends a minimum of 14 x 14 for the door and a barn at least 40 x 60 x 16 for just trailer storage.
If you want to store tractor and trailer go with a 40 x 80 x 16 pole barn.