How to plan commercial electrical work in a building that stays open, so staff and customers are barely affected.

Quick answer: Plan shutdowns in advance, phase the work area by area, use out of hours slots for anything disruptive, and agree clear communication with the people using the building.
Before any work starts, it's worth mapping out how the building is used. Which areas are busiest and when? Are there comms rooms, fridges or equipment that can't lose power? Knowing this early shapes the whole plan.
Breaking the job into zones or floors means only part of the building is affected at any time. People can be moved around the work rather than the work being squeezed around people.
In an occupied building, housekeeping matters as much as the electrics. Work areas should be clearly segregated, tools and cables kept out of walkways, and each area left safe and clean at the end of every shift.
Having one person to call if plans change makes a big difference. It keeps decisions quick and stops small issues turning into bigger ones.
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Related service: Electrical Works