A field services SLA is a promise with a stopwatch, and most of the negotiation happens in the definitions rather than the numbers. Two contracts can both say "four hours" and deliver experiences a day apart, because everything depends on four hours of what, measured from when, at which sites, during which hours. Buyers who read SLAs as marketing get the marketing. Buyers who read them as engineering get service.
The oldest trick in the schedule: response time is when someone acknowledges or attends; restore time is when the site works again. A four-hour response SLA is compatible with a three-day outage, honoured throughout. Trading businesses should anchor on restore, because the store does not sell acknowledgements. Restore commitments force the provider to solve the whole chain, technician, skills, parts, since arriving without the right spare restores nothing. Which is why restore SLAs are rarer and more expensive: they are promises about logistics, and only providers with real spares strategies can keep them.
When does the clock run? Business-hours measurement converts a Friday 6pm failure into a Tuesday fix while meeting a "four-hour" SLA. Estates that trade evenings and weekends need cover shaped to trading hours, and the SLA should say so in writing rather than imply it in a sales deck.
Where does the SLA apply? Every national SLA carries a geography schedule, and the schedule is where regional sites quietly become second-class: metro four hours, regional next business day, remote "reasonable endeavours". Sometimes that tiering is honest physics; the question is whether it matches your estate's reality and revenue. Ask for the SLA per site on your actual site list, not per tier on theirs, and check which tier your twenty most valuable non-metro sites landed in.
An unmeasured SLA is a mood. The contract should specify the reporting: per-incident timestamps (logged, dispatched, arrived, restored), monthly performance against SLA by region and severity, and a review cadence where misses are explained rather than averaged away. Averages hide precisely what matters, one catastrophic week disappears inside a good quarter. Ask for exception-level reporting, and for the data itself, not just the provider's summary of it, the same discipline branch network support models depend on.
On penalties: service credits keep providers honest, but nobody ever traded their way out of a bad support relationship one credit at a time. Treat credits as instrumentation, and the real remedy as the exit clause. A provider confident in their coverage will accept measurement without flinching; reluctance to be measured is itself a measurement.
Ask what an SLA visit costs when it happens. Time-and-materials support turns every incident into an open invoice, with travel, and regional sites suffer most. Our break/fix model prices per incident, fixed, travel included, anywhere in Australia, which makes the SLA conversation refreshingly short: the promise is the price.
Want an SLA you can actually audit? Speak to an expert.

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