There are many situations where people want a toilet in their shed. Whether it be for that time when they are working in the shed and are caught short and need a toilet urgently, to the time when they use the shed for an office or accommodation.
Many sheds are on a slab and, in those instances, they can only use toilets that are self-contained, such as the Nature’s Head© or OGO™
There are other instances where the shed might have a raised floor. If there is a clearance under the floor of at least 650mm they can use a split system such as the Classic 650.