A mechanical contractor can be profitable on every job on the books and still come up short on a Friday. That sentence describes more MEP firms than most people in the industry would guess, and it has almost nothing to do with how the work was bid or performed.

The cause is the shape of the cash. Mechanical contractors buy heavy at the front of a job and collect at the back, and the equipment-intensive nature of the trade makes that front end heavier than it is for most others on the site.

Why MEP Carries More Float Than Most Trades

A mechanical scope typically requires equipment purchased or committed early—rooftop units, chillers, boilers, air handlers, large-diameter pipe, controls. Lead times force procurement well ahead of installation, so the contractor is carrying substantial material cost before crews ever mobilize. Add prefabrication, which improves productivity but shifts cost even earlier, and skilled labor paid weekly from day one.

The collection side, meanwhile, moves at commercial construction speed. Progress billing is generally monthly, submitted with lien waivers and any certified payroll. The GC reviews on its schedule. Payment follows on contract terms after approval. Work performed in week one is commonly paid between day 45 and day 75.

Then there is retainage—commonly 5 to 10 percent of the contract, held until substantial completion or final closeout. Mechanical scopes are frequently among the last to close out, because commissioning, balancing, controls verification and O&M documentation all sit at the end of the schedule. That means MEP contractors often wait longer for retainage than the trades that finished ahead of them, on a slice that may represent most of the job’s margin.

The Dangerous Job Is the Big One

The project that changes the company also multiplies the float. Twice the size means roughly twice the up-front equipment and labor cost carried across the same or longer collection timeline. Larger GCs and institutional or public owners generally have slower and more documentation-heavy payment processes, not faster ones.

That is why contractors get in trouble in the middle of the job that made them. The margin is real. It has simply not arrived.

What Widens It Further

Change orders performed before approval. Mechanical scopes generate change orders constantly—field conditions, coordination conflicts, owner-driven revisions. Schedule pressure pushes crews to perform before the paperwork clears, and that work is cost incurred and not billable. It is the most common self-inflicted cash wound in the trade.

Equipment deposits and lead-time commitments. Money leaves for a chiller months before that chiller is installed, let alone billed.

Chronic slow-pay GCs. One relationship with a consistently long approval cycle finances itself on your balance sheet across every job you run with them.

Seasonality. Spring front-loads spending while collections trail into summer, putting the worst cash position of the year inside the busiest stretch.

Fix the Free Things First

Financing should never be the first move. Several levers cost nothing and improve every financing option you later have.

Negotiate mobilization or material deposit payments into contracts. On equipment-heavy scopes this is a reasonable ask, and contractors who ask receive it more often than contractors who assume they cannot.

Bill progress twice monthly where terms allow. Cutting the billing cycle in half removes real days from the timeline.

Submit complete pay applications the first time. A rejected application does not cost a week—it restarts the clock and your position in the review queue.

Get change orders approved in writing before the work is performed. Every experienced contractor knows this. A striking number still do not do it.

Track days-to-cash by GC using actual payment dates, not stated terms. The number usually names one or two relationships responsible for most of the strain, which converts a vague cash complaint into a specific business decision about repricing or walking.

Matching the Instrument to the Gap

When a gap remains after the operational work, different structures fit different parts of it.

Construction invoice factoring advances against approved progress billings. It converts the approval-to-payment wait into immediate capital and scales as you bill. Read recourse terms, whether the whole book must be factored, and whether customers are notified—those matter more than the headline rate.

Equipment financing belongs on owned equipment: trucks, rigs, shop machinery. It is cheaper than working capital and secured by the asset. Long-lived assets should never be funded out of short-term capital.

Revenue-based funding provides a lump sum against deposit history, repaid as a fixed daily or weekly remittance. It covers what factoring cannot reach—equipment deposits and procurement before anything is billable, bonding requirements, payroll through a slow approval cycle. It is underwritten on bank deposits rather than collateral or multi-year tax returns, which is why contractors that banks decline routinely qualify, and it funds in days rather than months. It costs more than bank credit, so it belongs on bounded, dated needs rather than chronic shortfall.

A bank line of credit, where obtainable, beats everything else on cost. Arrange it when you do not need it; the timeline to secure one never matches the timeline of a crunch.

The Number That Tells You to Stop

The pattern that ends otherwise sound contractors is a chain of short-term positions—one to cover procurement, a second to service the first, a third by the next job. The underlying gap never closed, so each new debit lands on deposits that have not accelerated.

One diagnostic: combined daily debits divided by average daily deposits. Under roughly 15 to 20 percent is workable for most contractors. Approaching 40 percent means the financing itself has become the problem, and the answer is restructuring what already exists rather than adding to it.

Before signing anything, model the payment against your weakest recent month alongside payroll and fixed costs—not your average, and certainly not your best. If it only clears in a good month, it does not clear.

The Takeaway

The gap between draws is not a sign that something went wrong. It is how commercial mechanical work pays, and it always has. The contractors who last are the ones who measured the gap, shortened what could be shortened, and financed the remainder deliberately—before it financed them.