The Back Porch is a type of limited storage for your farm. Workshops, animals, and decorations can be stored in the Back Porch. It is unlocked at Level 36 and can be found by tapping the farm house.
When first unlocked the Back Porch has 5 spaces. You can upgrade the Back Porch to increase its capacity. Upgrades will require a combination of Barn Padlocks, Barn Nails, Shovels, and Light Bulbs. Keys can be substituted for the other items to upgrade faster. The items required for upgrading are kept in your Barn and count against its available storage.
Barn Padlocks and Barn Nails have a value of 8 keys each; Shovels have a value of 9 Keys each; and Light Bulbs have a value of 20 Keys each. If you are missing 4 Barn Nails it will cost you 32 (4*8) keys to complete the upgrade.
Each upgrade gives you 3 more storage slots and costs more than the previous upgrade.
The table below shows the cost to upgrade each time. The maximum capacity the Back Porch may be upgraded to is 50.
Cost in only