Counting Unfilled Overnight Cleaning Hours From Your Timecards

What counts as an unfilled overnight hour

An unfilled overnight hour is a cleaning hour your schedule called for and no one worked. An unplanned gap is a different problem, and it does not belong in the same count.

The cost estimate takes three steps. Count the empty hours from timecards, convert them to a loaded labor rate, then test which inputs carry the most weight. The result is a budgeting figure you can defend, not a forecast precise to the cent.

Pulling the gap from your timecards

Start with the schedule you published for the overnight floor window, then compare it night by night with clocked hours for the same window. The difference is your unfilled count. Keep the window fixed, so a late arrival does not inflate the gap.

Separate the causes before you total anything. A vacancy repeats every night until someone is hired, while a call-out is usually a single event. Model them apart, or the average will describe a night no one actually worked.

Turning hours into a loaded labor cost

The base rate is the easy part. The BLS Occupational Outlook Handbook, checked in November 2026, gives a 2024 median pay of $35,930 per year, or $17.27 per hour, for janitors and building cleaners. That is a national benchmark across employers, so use it to sanity check your own wage rather than as a substitute for it.

Wages are not the whole employer cost. According to the BLS employer cost release using March 2022 data, wages and salaries were 70.4 percent of private industry compensation and benefits were 29.6 percent, averaging $11.42 per hour worked. That figure is dated and covers all private industry, so check the latest release before quoting a load factor. Until then, a wage-only figure captures about seven-tenths of the cost and leaves the rest out.

Which inputs move the estimate most

Five inputs carry most of the weight. Test each one alone, holding the others fixed, and watch how far the total moves.

• The overnight pay rate, including any shift differential, since it applies to every empty hour.
• The share of scheduled nights left open, because a vacancy that lasts a quarter outweighs a month of call-outs.
• Overtime used to cover the gap, which carries a premium above the base rate.
• Benefit and payroll costs applied to hours actually paid, not hours scheduled.
• Recruiting and training costs, which appear only when you count separations.

Where the estimate breaks down

Averages hide the nights that matter. A site staffed on most nights but empty on Sundays can show a modest annual gap while the Sunday floors go unfinished. Break the count out by night and by zone before you total it.

Unfilled hours are not always lost hours. Some work slides to the next shift, some daytime staff absorb it, and some simply does not happen. Only the last category shows up as a real cost in floor condition, so name which one you are pricing.

A national median cannot see your labor market. Local wages, shift differentials, and recruiting difficulty will shift the rate, and industry sample data describes reporting suppliers rather than your facility.

What the service robot market says about floor care

According to the International Federation of Robotics, as reported in press coverage of its 2026 service robot data, global professional service robot sales rose 24 percent in 2025 to almost 250,000 units. Professional cleaning ranked third among applications, with floor cleaning as the main use.

Transportation and logistics stayed the largest application, with 117,500 units in 2025, up 21 percent and about 47 percent of the market, per a press summary of the same data. Check those figures against IFR's own report before quoting them. The summaries do not give a 2025 unit count for cleaning robots, so do not infer one from the rank.

For the prior year, IFR counted more than 25,000 professional cleaning robots sold, up 34 percent. IFR warns against mixing figures across reports, and its numbers come from a supplier sample, so read them as a directional benchmark rather than a census of the market.

Setting the labor total beside a lease quote

A labor total answers only half the question. The comparison is fair when the robot side covers the same floors, the same overnight window, and the same number of nights. Service Robot Co. starts with a site assessment, then quotes one fixed lease payment on a three-year lease.

Our RoboCare service covers every unit we lease, backed by regional service engineers in each state we serve. We are OEM-neutral, so the machine suited to your aisles and floor type is chosen across manufacturers rather than from one catalog. Details are at servicerobotco.com.