planning permission log store/ unit /work shop

[bradshaw groundcare]

hi i am needing more store space and have been looking into this type of building

 

Omega Steel Building | eBay

 

it would be used to keep my machines in tractor digger trailer etc, log store and a place to store a small amount of animal feed. i am looking to build this on a green belt land were i trade from. has any one else built similar and what problems did you come across with planning. thanks