How the work usually goes
Most commercial calls start with a phone conversation about what stopped working, when it started, and whether anything changed in the building recently. That last question matters more than it sounds. A new tenant appliance, a recent roof job, or a sprinkler activation two months ago often explains a fault that otherwise looks random.
On site, troubleshooting comes before quoting. Until the fault is found, any price is a guess, and a guess in a commercial building is usually wrong in an expensive direction. Once the cause is confirmed, you get a plain description of what failed, what it takes to repair it, and whether there is anything adjacent that is going to fail next. If parts have to be ordered, you will be told what the lead time looks like rather than left waiting.
Scheduling is the other half of commercial work. Retail and office spaces usually cannot lose power during business hours, so shutdowns get planned for early mornings, evenings or a day the suite is closed. After-hours work is available at an additional charge and the timing is confirmed by phone. This is a one-electrician operation with service vehicles, a trailer and lift access, which is well suited to service work, lighting and small projects, and not suited to large crewed builds.
Practical note: if you manage a building with tenants, the single cheapest thing you can do is get the distribution accurately labelled while nothing is broken. Every future service call, tenant shutdown and equipment install starts faster, and the labelling itself can be done during normal hours without disrupting anyone.