How Many Cleaning Hours Does Your Building Need?
The number of cleaning hours a building needs comes from three things: how many square feet actually get cleaned, which tasks happen how often, and how fast a trained cleaner can do each task. Cleaning companies call that speed a production rate, measured in square feet per hour. A widely used industry average from ISSA, the cleaning industry association, is about 3,289 square feet per hour for one person, but real rates swing a lot with floor type, furniture, restrooms, and the level of clean you expect. If you know your cleanable square footage and the hours a bid includes, you can check whether the plan is realistic.
This matters most when you're comparing proposals. Two companies can quote the same building with very different crew hours, and the difference usually explains the price gap better than anything else on the page.
How a cleaning company turns square feet into hours
ISSA describes the method, often called workloading, in a few steps.
First, measure cleanable space. That's not the gross square footage on a lease. It's the area that actually gets cleaned, broken out by floor type and use, such as carpeted open office, hard-floor corridor, or restrooms. Architectural drawings help, but a physical check is more reliable.
Second, set the scope. Each task gets a frequency. A task done five nights a week happens 260 times a year. Weekly, monthly, and periodic tasks like carpet extraction or floor refinishing get their own counts.
Third, apply a production rate to each task. ISSA's own example: vacuuming 15,000 square feet at 10,000 square feet per hour takes 1.5 hours a visit. At 260 visits a year, that's 390 hours for that one task. Repeat for every task and area, add it up, and you have the labor the scope really needs.
The rates themselves usually come from ISSA's Cleaning Times reference, which lists average times for hundreds of individual tasks and tool combinations. ISSA is clear that these are benchmarks for bidding and estimating, not a time study of your building.
A quick way to check a bid
You don't need to rebuild a contractor's estimate to sanity check it. Divide your cleanable square feet by the hours per visit in the proposal. The result is the production rate the company is planning to work at.
Say a bid covers 12,000 cleanable square feet in 3 hours a night. That's 4,000 square feet per hour. Whether that works depends on the building. A mostly open office with a couple of restrooms can be cleaned faster than a floor full of private offices, exam rooms, or a busy break area. If the implied rate looks far above the average, ask what tasks are being skipped or spread out over the week. If it looks far below, ask what the extra time is for.
Either way, the conversation is useful. A company that built its number from your actual rooms and tasks can explain it.
Why two bids for the same building can be hours apart
Different hours don't always mean someone is wrong. Common reasons include:
Different scopes. One bid may include nightly restroom detail and full vacuuming, while another vacuums traffic lanes nightly and the full floor weekly.
Different equipment. ISSA's rates change with the tool. A wider vacuum or a microfiber flat mop system covers more floor per hour than smaller or older tools.
Different square footage. One company measured cleanable space, and another used the gross number from the listing.
Different expectations. One estimate assumes a higher standard of appearance than the other.
Lining the bids up on the same scope, frequency, and square footage usually makes the comparison much clearer. For more on what drives price, see our guide to commercial cleaning cost factors.
What level of clean are you paying for?
APPA, the association for educational facility leaders, ties staffing to five appearance levels, from Level 1, "Orderly Spotlessness," down to Level 5, "Unkempt Neglect." Its guidelines express staffing as cleanable square feet per worker, and the area one worker can cover grows as the expected level drops. The descriptions are written for campuses, but they're a handy way for any building owner to put a target into words. Level 2, "Ordinary Tidiness," for example, allows marks or smudges that only show on close inspection, while Level 3 allows visible dust and dull spots in walking lanes.
Agreeing on a target level before pricing helps both sides. It keeps a low bid from quietly assuming a lower standard, and it keeps a high bid from padding hours you don't need.
Hours aren't the only thing to judge
A realistic labor plan is a good sign, but it isn't the whole picture. Consistent crews, clear communication, a supervisor who checks the work, and a scope written in plain language all affect what you see in the morning. Hours tell you whether a plan can work. The rest tells you whether it will.
Frequently asked questions
What is a janitorial production rate?
It's the amount of space, usually in square feet per hour, that one cleaner can finish for a given task or bundle of tasks. Companies use production rates to turn a scope of work into labor hours and a price.
What is ISSA 612?
It's the common name for ISSA's Cleaning Times reference, a list of average times for hundreds of cleaning tasks and tools. It's a benchmark for estimating, not one flat rate for a whole building.
How do I find my building's cleanable square footage?
Start with floor plans and subtract areas that aren't cleaned, such as locked storage, mechanical rooms, or tenant spaces outside the contract. Then group what's left by floor type and use. A cleaning company preparing a free estimate should do this with you.
Does fewer hours mean a worse cleaning company?
Not by itself. Better equipment, an efficient routine, or a smaller scope can all lower hours. Ask how the number was built.
Getting a number you can trust
Clear Facility Services, based in Fridley, can serve commercial buildings of any type across Hennepin, Ramsey, Anoka, Scott, Dakota, and Carver counties, with cleaning scheduled after hours so it stays out of your team's way. We'll measure your space, talk through the tasks and frequency that fit it, and show you how the hours add up. Call +1 (952) 900-2215 or email info@clearfacilityservices.com to set up a free estimate.
