How do I estimate my office cleaning cost?

Most businesses go straight to three quotes and then try to work out which one is right. That order is backwards. Without an independent estimate you have no way to tell whether the cheapest quote is efficient or simply under-scoped, and no way to tell whether the most expensive one reflects a real requirement or a padded margin.

A rough estimate built in fifteen minutes changes the conversation. You stop asking how much and start asking how many hours, which is the question that actually determines the service you get.

It also protects you from the most common failure mode in cleaning procurement: accepting a price that cannot deliver the scope, then spending the next six months managing complaints about a contractor who was set up to fail from the first day.

Start from the lettable area on your lease, then subtract everything a cleaner does not service. Plant rooms, comms rooms, riser cupboards and permanently locked storage all come out. So does the floor area occupied by fixed joinery, workstations and equipment where nobody is mopping underneath.

Then add anything outside the lease line that you expect cleaned: an entry lobby you control, a balcony or terrace, an end-of-trip facility, a tenancy kitchen that sits in common space.

For a typical fitted-out office, cleanable area commonly comes in meaningfully below lettable area. Getting this figure right matters because every subsequent step scales from it, and because it is the number you will ask every contractor to price against.

Frequency is the largest single lever on your total cost and the one most businesses set by habit rather than by need. The honest way to set it is to work from bathroom load and food waste, because those two things drive complaints far more than dust does.

A useful rule of thumb: the more people share a bathroom and the more food is prepared and eaten on site, the higher the minimum viable frequency, regardless of how large or small the floor is. A twelve-person office where everyone eats lunch at their desk needs bins emptied daily even if the carpet could go a week.

It is also entirely legitimate to split the frequency. Many offices run a daily light service covering bins, kitchen and bathrooms, with a fuller clean two or three times a week covering vacuuming, dusting and detail. That structure often costs less than a uniform daily full clean and produces better perceived cleanliness.

This is the step contractors do in their heads and clients almost never do at all. Break the attendance into its components and estimate each, then add a contingency for the parts that always take longer than planned.

Bathrooms are the anchor. A full bathroom service including pans, basins, mirrors, floors, restocking and waste is rarely a five minute job, and a two-pan block with a shower takes materially longer than a single accessible toilet. Kitchens are the second anchor, particularly where dishes, a dishwasher and a coffee machine are involved.

The open floor is usually the fastest part per square metre. Vacuuming and surface wiping across open-plan space moves quickly; it is the meeting rooms, the sit-stand desks with cable trays, the glass partitioning and the reception that slow it down.

Add the fixed overheads: arriving, unlocking, setting up the trolley, taking waste to the bin room, locking up and completing the site record. On a small site those fixed minutes can be a meaningful share of the total attendance, which is why very small sites cost more per square metre than large ones.

Multiply your estimated hours per attendance by an hourly rate, then by attendances per month. Use four and a third weeks per month rather than four, or you will underestimate by roughly eight per cent.

For general office and commercial work Pro Clean Corp quotes $35 to $50 per hour. Its published pricing structure distinguishes one-off cleaning at $40 to $50 per hour from ongoing contract cleaning at $30 to $45 per hour, which reflects the real economics: an ongoing contract lets a contractor roster stable staff and amortise setup, so the rate is lower.

Run the calculation twice, once at the bottom of the band and once at the top. That gives you a range rather than a false single figure, and the range is what you should carry into the quoting process.

If your building has specialist requirements, use the appropriate band instead. Warehouse and industrial work runs $45 to $65 per hour, and specialist or medical work $55 to $75 per hour.

Compare your calculated monthly figure to the indicative ranges Pro Clean Corp publishes by facility type. If your estimate sits inside the relevant band, your assumptions are probably reasonable. If it sits well outside, one of your inputs is wrong and it is usually the hours.

A small office cleaned three times a week is indicated at roughly $600 to $1,200 a month. A medium office cleaned daily is roughly $1,200 to $2,500. A warehouse cleaned weekly is roughly $800 to $2,000, a medical centre cleaned daily roughly $1,200 to $2,800, and a strata building of eight to twenty units roughly $500 to $1,400.

These bands already include labour on-costs, materials, insurance, supervision and margin. That is why a quote that lands well underneath one of them is a warning rather than a win: the labour hours have almost certainly been reduced to hit the number.

Keep periodic and specialist work outside the recurring monthly figure, both in your estimate and in the contract. Bundling them makes the monthly number look larger, makes comparison harder, and makes it impossible to see what you are paying for when a periodic task is skipped.

Price these as separate scheduled line items with a stated interval and a stated price. Then you can drop or defer one without renegotiating the whole contract.

Consumables are the other common ambiguity. Decide whether the contractor supplies and charges for toilet paper, hand towel, soap and bin liners, or whether you buy them and the contractor simply installs them. Both models are fine. What is not fine is discovering the answer in month two.