One GC is too much of your revenue
One general contractor is 40% of your year. Their payment terms are your payment terms, and their bad quarter is your bad quarter.
Concentration isn't a problem until it's the whole problem. One customer at 40% of revenue compresses your pricing, because they know what walking away would do to you. Their payment cycle becomes your payment cycle, so a slow month on their end is a slow month on yours. Sureties and lenders price that risk in whether or not you do.
Three moves, in order
Step 07: Monthly cadence
Weekly bookkeeping, cost to complete, and one CEO report, on the same days every month.
Other problems step 07 solves
Other things that go wrong
What owners ask
Customer concentration risk subcontractor?
One general contractor is 40% of your year. Their payment terms are your payment terms, and their bad quarter is your bad quarter. Concentration isn't a problem until it's the whole problem. One customer at 40% of revenue compresses your pricing, because they know what walking away would do to you. Their payment cycle becomes your payment cycle, so a slow month on their end is a slow month on yours. Sureties and lenders price that risk in whether or not you do.
Which part of the system fixes this?
The step is number 07, monthly cadence. Weekly bookkeeping, cost to complete, and one CEO report, on the same days every month. It's drawn from chapter 7 of CONTROL: The Construction Financial Operating System.
Is this normal for my trade?
Across the 48 trades in the benchmark reference, net profit at $1M–$5M averages 7% before taxes. If you're well under that and this page describes your month, the two are usually the same story. The published average tells you where the pack sits, and your own job costing tells you where you sit, which is the number that pays payroll.
Where do I start?
Measure revenue concentration by customer every quarter.
Can I fix this without touching anything else?
You can try, and it doesn't hold. Step 07 depends on step 03, overhead calculation and step 04, estimating system and step 05, software and bookkeeping alignment and step 06, project management. Install it ahead of those and it produces numbers nobody trusts, which is worse than the problem you started with.
Josh Luebker ran commercial construction projects before he ran the numbers behind them, on data centres, military bases, hospitals, and high-rises. He wrote CONTROL: The Construction Financial Operating System, which is an eight-step framework for commercial subcontractors, and it publishes on October 1, 2026. He is a master electrician who moved into the office and kept the field vocabulary.
Sulphur Prairie Operations LLC maintains the benchmark reference behind these figures. Every edition is reconciled against the newest CFMA survey release before it publishes here. Where a figure changes between editions, the older edition keeps its year in the title so a citation to it stays correct.