Choosing a unit that describes retail work
Cost per square metre is the obvious unit and the least informative one for retail. Two stores of identical area can differ by half in cleaning time depending on fixture density, whether there is a fitting room block, how much back-of-house and stockroom sits behind the trading floor, and whether there are customer amenities. Open floor is quick; everything around it is not. An area figure treats all of that as equivalent, which is why two stores of the same size can produce very different quotes.
A better unit is cost per visit per store, supported by a short profile: trading floor area, fixture density described simply as light, medium or heavy, number of amenity fixtures, fitting rooms, and back-of-house area. With that profile attached, a higher per-visit figure at one store becomes explainable rather than suspicious, and a low one at another becomes a question worth asking. Seven or eight data points per store are enough to make the comparison meaningful.
