MECHANICAL · MECHANICAL AND LIFE SAFETY · FIXED BY STEP 01

You Pay For The Chillers Six Months Before You Bill Them

The deposit clears in March, the balance clears at shipment, and the first pay app covering any of it goes in around August. Your credit line funds the months between.

WHY IT IS A MECHANICAL PROBLEM

For most trades the material buy is 20 or 30 percent of the scope, and it hits the books roughly when it gets installed. Mechanical buys the largest equipment package on the job, releases it before the slab is poured, and pays on the manufacturer's clock while collecting on the GC's. Nobody else on that site has half a million dollars of iron sitting in a factory queue with their PO number on it.

WHAT IT COSTS

The size of it

On a $1.2M mechanical scope with a $500K equipment package, that's $125K out at PO release and another $375K at shipment, funding roughly 90 to 150 days of receivable on a line priced at prime plus.

OVERHEAD AT $1M–$5M

16%

CFOS target 15% for mechanical.

GROSS MARGIN AT $1M–$5M

25%

CFOS target 26% for mechanical.

NET PROFIT AT $1M–$5M

CFOS target 11% for mechanical.

The check for the chillers clears in March and the pay app that covers them goes in around August. Custom air handlers and water cooled chillers still quote at 20 to 50 weeks, and the factory wants 25 to 50 percent down at PO release with the balance net 30 from the ship date. The GC pays 30 to 60 days after a pay app, and only bills stored material when the contract allows it, which means bonded storage, insurance certs, and title transfer paperwork most small mechanical shops never file. So the deposit goes out at PO release and the balance goes out at shipment, while the first dollar comes back a quarter later. The line of credit funds the difference, and nobody put that cost in the estimate.

WHAT TO DO

Three moves, in order

STEP 01

Build a one page equipment cash calendar for every open job: deposit paid date, ship date, balance due date, and the pay app that first bills the unit. That's four columns on every PO.

STEP 02

Before the next PO release, ask the GC in writing for stored material billing, and start the bonded storage, insurance cert, and title transfer paperwork that same week so the request survives the response.

STEP 03

Carry the float as its own estimate line: days between deposit and collection times your borrowing rate, priced into the equipment package the way you price crane time.

THE FIX

Step 01: Job cost structure

Seven cost categories and three levels of granularity, built so the estimate and the ledger use the same words.

CFOS-01 · CHAPTER 1

Job cost codes that match how you bid the work

What this step changes, what it depends on, and how to tell it's installed.

BENCHMARKS

Mechanical by revenue band

Every one of the 7 bands carries the CFOS target beside the published figure.

ACROSS EVERY TRADE

Cost codes the field ignores

You have 200 cost codes. The crews use four of them, and one is called Miscellaneous.

SAME TRADE

What else costs mechanical contractors money

MECHANICAL · CFOS-06

Fab Release Is Gated By Two Clocks You Don't Own

The coil line has nothing to cut because the engineer has held your submittals for five weeks and the coordination model is still bouncing. You pay shop payroll either way.

MECHANICAL · CFOS-05

The Retention Waits On A Test Only You Can Pass

Retention releases against the commissioning agent's sign off, and the system being tested is yours. A building accepted in July can't prove its heating until the weather turns.

MECHANICAL · CFOS-06

Nine Trips To The Job, Two Of Them Billable

Your crew makes nine separate trips to that building, from underslab to punch. The schedule of values has one line on it that says rough-in.

MECHANICAL · CFOS-02

Prefab Spools Spend Money Three Months Before Install

The shop cuts duct and welds spools in month three for work that installs in month six. If that cost sits in overhead, every job reads rich and the shop reads like dead weight.

SAME MECHANISM, OTHER TRADES

The same mechanism in other trades

CONCRETE

Eight Tons of Rebar Tagged to a Drawing That Changed

The EOR approved the placing drawings, the fab shop cut and bent to the bar list, and then somebody moved a footing. Now you own bundles tagged to grid lines that no longer exist.

DEMOLITION

Your Breaker Burns Tool Steel That Overhead Pays For

A hammer chews $9,000 of tool steel on one teardown and the job that ate it never sees a dollar of the cost. The margin looks fine and the bank account disagrees.

DRYWALL

Lead-lined board is eight weeks and non-returnable

The imaging room's board is eight weeks out, cut to the shielding drawings, and the deposit is gone the day you release the order.

QUESTIONS

What mechanical owners ask

How do i cover the equipment deposit before the first pay app?

The deposit clears in March, the balance clears at shipment, and the first pay app covering any of it goes in around August. Your credit line funds the months between.

What does it cost?

On a $1.2M mechanical scope with a $500K equipment package, that's $125K out at PO release and another $375K at shipment, funding roughly 90 to 150 days of receivable on a line priced at prime plus.

What do I do first?

Build a one page equipment cash calendar for every open job: deposit paid date, ship date, balance due date, and the pay app that first bills the unit. That's four columns on every PO.

What are mechanical contractors supposed to be making?

Mechanical runs 25% gross margin, 16% overhead and 9% net profit before taxes at $1M–$5M. The all-trade average is 7%, so this trade sits 2 points above it. The CFOS target is 11%.

Which part of the system fixes it?

The step is number 01, job cost structure. Seven cost categories and three levels of granularity, built so the estimate and the ledger use the same words. It comes from chapter 1 of CONTROL: The Construction Financial Operating System.

AUTHOR

JOSH LUEBKER

MASTER ELECTRICIAN · 150+ PROJECTS · $2.1B+ MANAGED

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.