Describing reach by method rather than by measurement
The most durable way to write this is not a number but a description: reachable from floor level or from a low step, without a ladder or platform. That phrase applies identically in a showroom, a warehouse and an office, and a cleaner does not need to measure anything to apply it. A number sounds precise and then falls apart the moment somebody stands on a mezzanine or a raised platform.
It also removes the grey area where an ambitious cleaner reaches something today and cannot reach it next week. Consistency matters more than height. If a surface is above the line, it should be visibly above the line every visit, so the client sees a stable result and the periodic conversation happens on schedule rather than after somebody notices dust on a beam.
