Commercial doors are available as a standard up to 24 in width.
Pole barn door height.
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.
Residential doors are available in most heights to 18 wide.
Narrower doors can be made special but are more expensive than the 8 width.
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.
If you need a 10 foot high opening you can know that 12 foot tall walls will work well for this.
10 12 14 etc.
If you re building a pole barn garage the average garage door height is 7 to 8 tall.
In some cases usually 7 or 8 heights 20 width residential doors are available.
If you want to store tractor and trailer go with a 40 x 80 x 16 pole barn.
If you need to store an rv motorhome or camper most models require a minimum of 12 clearance to get inside a door.