First trade in, last one paid, and held twice
The pad has been finished and driven on for two years and the GC is still sitting on ten percent of your contract.
Every other subcontractor's retention clock starts near the end of the job, when substantial completion is already in sight. Yours starts at the beginning and runs the entire length of a building you never touched, gated by weather and seed germination that no amount of pushing can speed up. Your direct costs, the fuel, the trucking, the imported fill and the payroll, all cleared your bank account before the steel went up.
The size of it
On a $1.2M sitework contract that's $60K to $120K sitting out 20 to 26 months, financed on your line of credit. The work that generated it was paid for out of pocket in the first 90 days.
Mass grading and underground are usually complete inside the first 10% to 20% of an 18 to 30 month build, but retainage of 5% to 10% releases at substantial completion of the whole project, then waits another 30, 60 or 90 days for the GC to collect and pass it down. Sitework carries a second gate nobody else has: the GC often won't release site retention until the stormwater permit is terminated. Final stabilization means 70% of pre-construction perennial vegetative cover, and grass is seasonal. Miss the growing window and the Notice of Termination waits for next spring, which means your retainage waits for next spring, and in arid regions the permit contemplates up to three years of vegetation establishment.
Three moves, in order
Step 07: Monthly cadence
Weekly bookkeeping, cost to complete, and one CEO report, on the same days every month.
What else costs excavation contractors money
The same mechanism in other trades
What excavation owners ask
How long does site retainage take to be released on sitework?
The pad has been finished and driven on for two years and the GC is still sitting on ten percent of your contract.
What does it cost?
On a $1.2M sitework contract that's $60K to $120K sitting out 20 to 26 months, financed on your line of credit. The work that generated it was paid for out of pocket in the first 90 days.
What do I do first?
Age retention by job on its own monthly schedule, with the substantial completion date and the seeding window written next to each balance.
What are excavation contractors supposed to be making?
Excavation runs 21% gross margin, 14% overhead and 7% net profit before taxes at $1M–$5M. The all-trade average is 7%, so this trade sits right on it. The CFOS target is 10%.
Which part of the system fixes it?
The step is number 07, monthly cadence. Weekly bookkeeping, cost to complete, and one CEO report, on the same days every month. It comes from chapter 7 of CONTROL: The Construction Financial Operating System.
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.