Measuring coverage against exposed floor
If half a cellar floor is under stock, a clean that covers the other half has covered everything available. The difficulty is that nobody wrote that down, so the venue reasonably reads its invoice as buying a whole floor. Stating the exposed area as the unit of work removes the ambiguity and makes the rotation for the covered sections a visible, purchased item rather than an omission.
This also gives the venue a decision it can act on. Where stock is on the floor because there is nowhere else for it, that is a storage problem with a cleaning symptom. Where it is on the floor out of habit, a pallet or a low rack changes what is possible permanently. Either way the scope should describe the room as it is. A proposal that quietly assumes an empty cellar has described a different building.
