A workshop is not a small warehouse. The eaves are low enough that mounting height stops being the dominant variable, the work happening in it needs good light at specific places rather than even light everywhere, and the person deciding is usually the person standing at the bench paying the electricity bill.
Usually the occupier, who frequently owns the unit and pays the bill directly.
In a warehouse you light aisles. In a workshop you light benches, machines and inspection areas, where people do close, sometimes hazardous work. Lighting the floor plate evenly is both more expensive and worse: it produces adequate general light and inadequate light exactly where it matters.
A specification worth paying for is set out against the layout of the work, with general lighting at a modest level and higher levels locally. That usually reduces total installed load rather than increasing it.
At four or five metres, the access equipment is a tower or a small lift rather than a MEWP, the fittings are ordinary rather than high bay, and much of the work can be done in a normal working day. That makes the cost per fitting lower than a shed and the job far quicker.
It also means the useful quote question changes. In a warehouse you ask about mounting height and access. Here you ask about fitting count against the bench layout and whether the existing circuits can be reused.
Someone welding, machining, spraying or inspecting a finish needs to see detail and colour accurately, and needs not to be dazzled by a fitting in their line of sight. The most efficient fitting on the sheet is not automatically the right one.
This is the building type where a cheap specification is most likely to be rejected by the people using it, and lighting that gets switched off or supplemented with task lamps has saved nothing.
In most of the building types on this site, the person holding the certificate and the person paying the electricity bill are different people, and that split is the main obstacle. In an owner-occupied workshop they are the same person, so the business case is simply payback.
That makes this one of the easiest building types to get a decision on, and one where the decision is usually made on running cost rather than on compliance.
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