Tool Sheds are buildings available on FarmVille. It will increase a farmer's storage limit by 2 items.
A tool shed is awarded to a farmer who obtains the red ribbon for A Pretty Penny.
As of January 8th, you can now upgrade tool sheds twice. Individually for both upgrades, you must send out a request and get 10 neighbors to help each time. The first upgrade results in 7 storage; the second upgrade results in 14 storage. You can also pay 10 FarmVille Cash for the next upgrade available and get it immediately. Upgrades can be performed on any storage buildings, chicken coops, and dairy farms, with the latter two coming soon.
A fully upgraded tool shed is actually the highest efficiency storage building that can be purchased without FarmVille Cash. It can hold 14 items while taking up 16 spaces. Contrast this with a fully-upgraded red barn which holds 32 items while taking up 48 spaces. Three fully-upgraded tool sheds will hold 42 items and take up exactly as much space as a red barn. However, the total cost of three sheds is 42,000 coins, which is 2,000 more than one red barn.