Professional skylight cleaning in 2026 costs roughly 2-12 USD per square metre per visit depending on height and access, while a roof-capable robot costs 3,000-7,000 USD plus 500-900 USD annual consumables. Break-even usually lands between two and four visits per year over a five-year horizon.
That is the whole answer. Everything below is the working, which is what you need when a finance team asks why the number is not lower.
What drives the per-visit price?
| Access method | Cost per m2 per visit | Notes |
|---|---|---|
| Pole from ground or terrace | 2-4 USD | Only for low glazing, limited reach |
| Gantry or catwalk | 3-6 USD | No rigging, fastest, needs building design |
| Scaffold or MEWP | 5-9 USD | Setup cost dominates small roofs |
| Rope access | 7-12 USD | Permits, spotter, certification |
Two structural facts sit behind those ranges. First, mobilisation is a fixed cost, so small roofs pay more per square metre. A 60 m2 skylight cleaned by rope access often costs three times the per-metre rate of a 600 m2 roof. Second, permits and traffic management in dense cities add a day of lead time regardless of area.
The other thing buyers miss: frequency. Roof glass in an industrial area soils far faster than in a residential suburb. A factory skylight may need quarterly cleaning to keep daylight transmission where it was designed to be. That quarterly frequency is what makes the robot case strong.
How does the robot side add up?
- Machine: 3,000-7,000 USD for roof-capable, 400-900 USD for light tier.
- Consumables: pads, seals, wipers at 500-900 USD a year at commercial duty.
- Labour: 2-5 hours per 200 m2, usually one trained operator.
- Tether and anchor inspection: annually, typically 150-400 USD.
- Replacement horizon: 5-7 years with servicing, 3-4 without.
Add those and a 5,000 USD machine costs roughly 1,400-1,800 USD a year over five years including consumables, before labour. The labour is where the comparison actually turns, because you pay it either way, but at a lower rate than a rope access crew.
When does the robot lose?
Three cases. Roofs under 150 m2, where the machine’s fixed cost cannot amortise against small areas. Roofs cleaned once a year, where the machine sits idle for 364 days and batteries degrade in storage. And roofs with heavy structural obstacles, where manhandling the robot between sections costs more time than a crew with a pole would spend.
There is a fourth case nobody advertises: buildings where the glass is not flat. Sloped, faceted or domed skylights demand either a specific machine design or hand work, and the machines that handle those shapes are the expensive ones. If your roof is a 1990s faceted atrium, get quotes from a cleaning contractor before you consider buying.
What do facility managers actually do?
A pattern that shows up repeatedly in 2026: buy one robot for routine passes, keep a service contract for the twice-yearly deep clean and any high-risk glass. The robot handles the weekday grime, and the crew handles the gutters, seals, frames and the faces the machine cannot reach.
That hybrid is usually cheaper than either pure option, because you reduce service frequency without losing the professional inspection that catches failing seals and blocked drainage before they become leaks. Skylight leaks are far more expensive than skylight cleaning.
If you are at the stage of matching a machine to your roof, our Lingfeng S1 review covers the stepped and edged glazing case, and the full review index lets you compare tiers before requesting contractor quotes.
Who should buy and who should hire
Buy if you have over 200 m2 of accessible roof glazing, clean at least three times a year, and have someone on staff who can do a ten-minute pre-run inspection. Hire if the area is small, the frequency is low, the geometry is awkward, or the building has no safe route to the glazing. Hiring is not a failure. It is often the cheaper answer, and a contractor will tell you if the roof needs repairs that should happen before anyone cleans it.
Key Takeaways
- Service cleaning runs 2-12 USD per m2 per visit depending on access method.
- Robot ownership costs 1,400-1,800 USD a year over five years including consumables.
- Break-even lands at two to four visits a year over a five-year horizon.
- Hybrid plans are usually cheapest: robot for routine, crew for deep clean and inspection.
- Skip the robot under 150 m2 or under twice-yearly cleaning frequency.
How do you validate a contractor’s price?
Ask for two quotes on the same scope with a per-visit breakdown including mobilisation, access method and waste water. Contractors priced per square metre without stating access method are quoting a guess. The gap between the two quotes usually reveals which one inspected the roof.
What is excluded from most quotes?
Gutters, frames, sealant joints and the interior underside. Those are where leaks start and where cleaning is most awkward. A quote that covers only glass is not a maintenance programme, it is a window wash.
What about interior cleaning of the same skylight?
Rarely quoted and often needed. Condensation and dust settle on the inner face as well as the outer, and an atrium roof that looks clean from a mezzanine can be streaked from below. Budget interior glass separately, usually as a hand-pole job with a lift or a rolling tower, at a similar per-metre rate.
Buildings that skip the interior end up cleaning twice as often on the outside to compensate for a streak they never actually fixed. It is a common and quietly expensive mistake.