By counting the tiles it looks like the shower is approx 34"w. We have done 30"w and even narrower, but obviously wider would be preferable. The narrower the space, the more likely there will be some water leakage at the door joints, just from water bouncing off your body and through an open seam. This configuration, with the door on the short side, does help minimize leakage in a smaller space by maximizing distance from the shower head.