12×24. This storage shed is our best seller. And now this 12×24 portable storage shed is calling your name. It’s a side gable (wider than it is long). It has two windows on the front side with a 48″ door in between them. And because it has an 8′ sidewall, we also included an 8×80 roll door on the right wall. Lastly, we have equipped it with a freestanding light beside the swing door, so that you may do some late night browsing. $4460. $186/mo.