Apparently this is a carport, but I think it would do nicely as a storage spot for tractor and hay, etc.
High quality timber buildings, wooden carports, shelters, fences, gazebos and garages
lean to shed corrugated plastic roof - Bing images More
Plan 006G-0017 - Garage Plans and Garage Blue Prints from The Garage Plan Shop
Door Canopy Plans | Flat Roof Canopy
Building a wooden carport in 2 days - easy DIY
http://www.mobilehomerepairtips.com/mobilehomecarports.php has some information on to choose a carport for your home.
Radnor Oak Buildings built by Cheshire Oak Structures.
Introducing the South Downs Boot Room by deVOL
Attached carports | Attached Carport Plans | Free Garden Plans - How to build garden ...