When you reach level 36 or higher you will unlock the new feature, The Back Porch. You can store Workshops, Crops, animals, and decorations inside!
You can upgrade the capacity of the Back Porch. Tap on the White Farm House, and see what items are needed to increase the storage. You'll need nails, padlocks, shovels and a new item, Lightbulbs which can be found in the Mallard Mill.