

13 extra labor hours dropped this account from 24.4% margin to 18.3%
I was looking at a recurring commercial cleaning account and wanted to see how much a relatively small labor overrun could actually affect the month.
The estimate was:
- $4,850 monthly revenue
- 119 labor hours
- $23 loaded labor cost/hour
- $928 in other monthly costs
That worked out to roughly $1,185 profit at a 24.4% margin.
Then I kept revenue and the other costs exactly the same and changed actual labor to 132 hours.
So only 13 extra hours for the month.
That added $299 in labor cost, and the result moved to:
$886 profit / 18.3% margin
That’s about a 6.2 percentage-point margin drop from a 10.9% labor-hour overrun.
If that same monthly variance kept happening for a year, it would be about $3,588 less profit.
The part that caught my attention is that 13 hours across an entire month doesn’t sound huge until you look at what it does to the margin.
For people managing recurring commercial accounts: when you see something like this, do you investigate workflow/staffing first, or do you start questioning the original price?