Report four numbers to your board: square metres cleaned per hour, cost per square metre, high-access incidents per 1,000 hours, and measured daylight transmission change. Anything more than one page will not be read.
Which numbers persuade a board?
Boards do not read maintenance logs. They read four things: money saved, risk reduced, asset performance and downtime. Translate robot telemetry into those four. Square metres per hour becomes cost per square metre. Incident rate becomes insurance and liability exposure. Battery cycles and fault logs become downtime risk. Daylight transmission, measured before and after a clean, becomes tenant comfort and energy load. A facilities manager who walks in with a one-page dashboard gets budget renewed. One who brings a folder of run logs gets asked to try again next year.
| Metric | Source | Target |
|---|---|---|
| m² per hour | Robot run log | 400-800 |
| Cost per m² | Costs / area | 0.90-1.80 USD |
| Incidents per 1,000 h | Incident log | 0 |
| Transmission change | Light meter | +3-8% after clean |
How do you capture the data?
The machine already logs it. Run time, distance, water used, battery cycles and fault codes come off most modern skylight cleaning robots without extra sensors. Export the run log monthly and merge it with your cost line: labour hours, water, detergent, brush replacement, finance payments. The only number you may have to add by hand is transmission, and a handheld light meter reading one panel before and after gives you that in a minute. Do not buy analytics software for this. A spreadsheet and a consistent monthly pull is enough for most buildings.
What does a good cost per square metre look like?
All-in, most commercial skylight robot programmes land between 0.90 and 1.80 USD per square metre for routine cleaning, depending on building height, water access and cycle frequency. Rope access on the same glass runs 3 to 6 USD per square metre, and gondola work sits in between once rigging is counted. Present the comparison over three years, not one, because the robot’s cost per square metre drops as you amortise the capital. A single-year table makes the finance payment look heavy and hides the trend.
How do you handle a bad month?
Report it. If a motor failed and the roof went three weeks without a clean, say so, with the cost. Boards trust the manager who shows the fault and the fix, not the one whose reports are always green. Track high-access incidents per 1,000 operating hours and aim for zero; a falling incident line alongside stable cost is the strongest renewal argument you can make. Keep the log auditable, because insurers and auditors both ask for it, and a documented record of zero incidents is worth more than a verbal assurance.
How do you set a baseline before you buy?
Measure the current cost before the robot arrives, or you will never prove a saving. Record the last twelve months of cleaning invoices, incident reports and any tenant complaints about the roof. That baseline is the comparison every future report is measured against. Facilities managers who skip this step end up presenting a cost with nothing to compare it to, and the finance team treats the number as new spending rather than a saving. The baseline is boring to assemble and it is the single most persuasive thing in the folder.
Which metric do tenants actually notice?
Daylight and comfort, usually without realising the cause. When glass is clean, interior light quality improves and artificial lighting can sometimes be trimmed. A light meter reading before and after gives you a defensible percentage, often three to eight points of transmission on a soiled roof. That figure speaks to tenants, who rarely care about cost per square metre but do care about a gloomy atrium. Pair the financial story with the daylight story and you cover both the controller and the occupier.
Related reading: contact our team, and the 2026 cost and payback breakdown.
Key Takeaways
- Report only four numbers to a board: cost per m², incident rate, downtime and daylight transmission change.
- Modern robots already log run time, water and fault codes; a spreadsheet beats bought analytics here.
- Routine robot cleaning runs 0.90-1.80 USD/m² versus 3-6 USD/m² for rope access, best shown over three years.
- Report bad months with the fault and fix; an auditable zero-incident log is a strong renewal argument.
What common reporting mistakes should you avoid?
Three mistakes sink a facilities report. Reporting effort instead of outcome, so the board hears about cycles run rather than glass cleaned. Mixing capital and operating cost, which makes a finance payment look like a maintenance bill. And hiding a failure, which destroys trust the first time it surfaces. Report outcomes, keep capital and operating lines separate, and show the faults with their fixes. A short report that is honest beats a long one that inflates activity. That is what gets the budget renewed.
How do you build the business case for a second machine?
Once one machine proves the numbers, a second one is easier to justify than the first. Use the same baseline, show that the first unit paid back on schedule, and point at the surfaces it still cannot reach within a single shift. Two machines cover a large roof in half the time and give you redundancy if one is down. The business case writes itself when the first machine’s log is clean and the coverage figure is steady. That record is the asset that makes the next purchase easier to justify.
Size the second machine to the gap, not to the brochure. If the first unit handles the flat field well, the second might be a compact model for tight slopes and edges. Buy for the work you cannot do, not for the work you already cover.