You gate the CO, which is why your retention pays last
The building can't get its certificate of occupancy without your acceptance test, and you're still chasing ten percent a year after you passed it.
Subcontractors wait an average of 167 days for retainage against 99 days for GCs, and two of three subs carry 10% where one of three GCs does. Fire alarm sits at the far end of that curve because its scope can't close until everybody else's does. The money you earned setting boxes in month four is the last money on the job to move.
The size of it
On a $400K scope that's $40K, usually more than the job's entire net profit, and you finance it for 18 months at your own cost of capital.
Your rough-in starts in month three or four. The AHJ acceptance test, the signed NFPA 72 record of completion, as-builts, O&M manuals, and owner training all come after every other trade has demobilized and gone home. The GC knows the CO hangs on your test, so it holds your retention hardest and longest, and it holds it through the punch tail of trades that have nothing to do with fire alarm. A ceiling grid change that moves one smoke detector reopens your punch list months after you already passed acceptance.
Three moves, in order
Step 05: Software and bookkeeping alignment
Live job costs inside thirty seconds, with the bookkeeping cadence that keeps them true.
What else costs fire alarm contractors money
The same mechanism in other trades
What fire alarm owners ask
Why does the gc hold fire alarm retainage the longest?
The building can't get its certificate of occupancy without your acceptance test, and you're still chasing ten percent a year after you passed it.
What does it cost?
On a $400K scope that's $40K, usually more than the job's entire net profit, and you finance it for 18 months at your own cost of capital.
What do I do first?
Get every open retention balance out of the general AR bucket and onto its own aging by job, with the acceptance test date and the CO date beside each balance.
What are fire alarm contractors supposed to be making?
Fire alarm runs 24% gross margin, 16% overhead and 8% net profit before taxes at $1M–$5M. The all-trade average is 7%, so this trade sits 1 points above it. The CFOS target is 11%.
Which part of the system fixes it?
The step is number 05, software and bookkeeping alignment. Live job costs inside thirty seconds, with the bookkeeping cadence that keeps them true. It comes from chapter 5 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.