Office cleaning projects are usually specified by floor area and then fail on the clock. The number that decides whether automation works in an office building is not how many square metres there are — it is how many hours exist between the last person leaving and the first person arriving. A building with 40,000 m² and a nine-hour window is an easier project than one with 9,000 m² and two.
This page works through what an office floor cleaning robot has to do differently in a commercial building: how to size a machine against the window rather than the floor, how mixed surfaces and multiple floors change the answer, and how a machine cycle actually compares with the contract cleaning model most offices already run.
Size the window first, the floor second
Start by writing down the real numbers for your building:
- When does the floor become available? Not the nominal office hours — the time the last occupant of each floor actually leaves, which is usually an hour later than the policy says.
- When does it have to be clear? Cleaning should be finished and the machine parked before the first early arrivals, not still working while the lifts fill up.
- How much of that window is usable? Subtract access, docking and the areas that are cleaned on a different rhythm.
Now divide the cleanable area by the usable hours. That result — square metres per hour of real requirement — is what the machine has to beat, and it is why a rated throughput figure is only a starting point: real-world coverage on an office floor lands well below the brochure number once the machine slows at furniture, works edges and returns to dock.
| If the window is… | The class that usually fits |
|---|---|
| Under two hours, one or two floors | Compact, fast-docking unit working the evening peak — the SC50 class (compact body, ~1,800 m²/h rated, about three hours per charge) |
| Three to four hours, several floors, hard floors | Wash-and-dry scrubber such as the Scrubber 50, so each floor is walkable the moment the machine passes |
| A whole building overnight | Large-capacity platform like the SC80 — 140 L / 170 L tanks and unattended cycles with automatic return-to-charge |
Multi-floor buildings: the lift is the project
In an office tower the machine spends more time waiting for transport than cleaning. Two design decisions follow from that:
- Treat each floor as its own work area. Our waterless SW55A is built around exactly this model: floors are handled as independent work areas rather than as one continuous route, which is also why a layout change on one floor does not break the plan for the others.
- Decide the lift policy in advance. Which lifts the machine may use, whether it shares with people or uses a service car, and what happens outside core hours. Retrofitting lift integration after commissioning is the most common cause of a stalled office rollout.
Where the plan has to survive constant change — tenants refitting space, furniture moving on a quarterly cycle — routes that are re-planned rather than hard-coded matter more than any single specification. That behaviour is one of the reasons the SW55A was positioned for medium-sized indoor venues with mixed floor plans.
Where a tower prefers to keep each floor self-contained rather than integrate with lift control, a compact sweeper with long per-charge endurance changes the arithmetic. The Monster sweeps an 890 mm path at up to 1,000 m²/h and runs 7, 9 or 11 hours depending on power setting, with a 30 L dust box, 12° of climbing and laser SLAM on a 25 m LiDAR (40 m optional). One machine can take a floor’s perimeter and open areas in a single charge, dock on that same floor, and resume from where it stopped after a manual interruption — which is what the per-floor work-area model actually requires.
Surface first: carpet, hard floor and the mixed office
Offices are rarely one surface, and the surface decides the machine before anything else does:
- Hard floors — stone, vinyl, tile and sealed concrete — accept a scrubber that washes and dries in a single pass. This is the class that removes the wet-floor window entirely, which in a lift lobby or a client-facing reception matters more than throughput.
- Carpet and matting need dry work: vacuuming and dust removal rather than washing. Waterless sweep-vacuum-mop units handle this without the machine being reconfigured into a different vehicle for each zone.
- The transition zones — entrances, lift lobbies, canteens — take the heaviest soil load in the building. They are also the areas where a walkable floor immediately behind the machine has the highest value.
Carpet is the case where a dedicated dry machine pays for itself. The K1 VAC vacuums, sweeps and dust-mops a 300 mm path at a rated 700 m²/h into a 10 L bin, cleans to 0 cm at the edge with a 15 mm side-brush reach, clears 2 cm obstacles and climbs 10°, and needs 52 cm of passage in a 44 cm-wide body — with 4 hours of vacuuming or 8 hours of dust-mopping per charge. For a building that is carpet in the meeting rooms and stone in the lobby, it is the machine that takes the carpeted half without a water tank on board.
Silence: running an office floor cleaning robot around people
Most offices do not empty completely. Early arrivals, late teams, security and facilities staff are all present while cleaning runs — and in flexible-working buildings the “empty” hours are narrower than they used to be. That makes noise a functional requirement rather than a comfort preference.
Waterless models built for quiet operation sit below 62 dB(A), which opens the daytime option: cleaning the areas that are least disruptive — circulation routes, lobbies, canteens between services — while people are working, instead of compressing the whole building into a shrinking evening window. The compact SC50 was designed with the same openings in mind, including operation during business hours and simple task dispatch from an app rather than a dedicated operator.
The other side of the same coin is presence management: a machine that slows for people, routes around them and signals its approach can work in an occupied office. One that stops and waits for a clear corridor is effectively restricted to empty hours, whatever its specification says.
The Mix1 sits at the quiet end of that range: below 55 dB, 550 mm body height for desk-level furniture, and sweeping, vacuuming, mopping, disinfection and air purification in a single pass. For buildings where the daytime window is a circulation route or a canteen between services, that is the machine class the noise argument points to.
Robot cycles versus the contract cleaning model
Most office buildings buy cleaning as a service contract, so the honest comparison is not “machine versus a cleaner” but “machine cycle versus the contract line”.
- What the contract buys is labour, supervision, cover for absence and consumables — priced per square metre and renegotiated annually.
- What the robot cycle buys is a defined coverage routine executed to the same standard each night, with the people you retain focused on the tasks machines do not do: washrooms, kitchens, waste, glass and detail work.
- Where the saving appears is on the hours that were previously spent walking a route with a machine behind it, and on the recruitment difficulty of early-morning and late-evening shifts — the payback structure is set out in the ROI walk-through.
In practice most offices start with one floor or one building, keep the human team on everything the machine cannot reach, and expand once the coverage records prove the standard holds. The sequence for that decision — area, window, narrowest passage, shift pattern — is the same as in the buyer’s checklist, and the evidence trail users tend to audit first comes from coverage history rather than from a single impressive night.
Two operational details decide whether the first months go smoothly. The charging dock has to be somewhere the machine can reach without crossing a pick-up point in the morning — a dock in a service corridor beats a dock in a lobby, even if the lobby is closer to the first route. And the wear path needs to be stocked from day one: the parts list is in the spare parts catalogue and the inspection cadence in the maintenance guide. Buildings that also run a campus or canteen operation usually extend the same plan across both; that wider estate view is in the education and campus guide.
How to start
Send us the three figures that size an office project: the cleanable hard-floor area per floor, the hours you actually have between the last person leaving and the first arriving, and how many floors the machine would need to reach. We will come back with a suggested class, a per-floor cycle plan and the docking positions — and tell you plainly if the window, rather than the floor, is the constraint you need to solve first. Send the three figures here, or compare classes in the machine overview and the industry guide.
- The window is fixed and shortA few evening hours have to cover every floor in scope, and the window does not stretch because the work does not fit.
- The lift is the real projectIn a multi-floor building the machine spends its time waiting for a lift rather than cleaning.
- People are still at their desksEarly arrivals, late leavers and hot-desking mean the floor is rarely empty, even at night.
- Carpet and hard floor in one buildingA mixed office needs more than one method, and the handover between them is usually unplanned.
- Quality is invisible until it is notNobody notices the floor until it fails in front of a client.
- Sized to the window, not to the floorThe machine is specified for the hours available, which is what makes a route finishable.
- Multi-floor work becomes plannableLift handling and docking positions are agreed up front instead of discovered on the first night.
- Quiet enough to work around peopleAreas still in use can be cleaned instead of skipped.
- One standard across mixed surfacesCarpet and hard floor are covered by a documented sequence rather than by whoever is free.
- A coverage record for the contract reviewTask history turns a claim that the floor was done into something that can be shown.