MECHANICAL, PLUMBING & HVAC CLUSTER · CFOS TRADE OPERATING SYSTEM

WHY PLUMBING CONTRACTORS LOSE MARGIN WITHOUT KNOWING IT.

QUICK ANSWER

Plumbing margin is lost to three specific things: the two-hump canyon, the allowance ambush, and the buried evidence. All three are measurable, and all three are invisible without job costing that reads against the estimate.

Plumbing contractors at $1M to $5M net 7.5 percent on the SPM 48-trade dataset, rising to 9.5 percent by $25M to $50M; the CFOS target at $1M to $5M is 11 percent. The distance between the trade average and the CFOS target isn't a pricing problem in this trade. It sits in the three mechanisms below, each of which moves margin without appearing as a failure on any single job. Underground and rough-in spend the money; trim-out collects it, months later, behind punch and retainage. A flat percent-complete SOV starves the front and strands the back; phase-weighted billing is the trade's oxygen.

BY JOSH LUEBKERPublished 2026-08-06Updated 2026-08-06
THE THREE BIG LEAKS

THE MATH BEHIND THE MISSING CASH.

LEAK 01

The Two-Hump Canyon

Underground and rough-in spend the money; trim-out collects it, months later, behind punch and retainage. A flat percent-complete SOV starves the front and strands the back; phase-weighted billing is the trade's oxygen.

LEAK 02

The Allowance Ambush

Fixture allowances reconcile at the end unless the contractor reconciles them in writing as selections land. Late selections, silent substitutions, and unpriced deltas are the finish line's favorite back-charges.

LEAK 03

The Buried Evidence

Under-slab surprises get documented before backfill or they never happened. The photograph taken before the concrete truck arrives is worth more than the claim filed after it leaves. (cfos-job-profitability-system) ---

HOW CFOS FIXES IT

WHAT CHANGES IN THE FIRST 60 DAYS.

The rough-in cash hole (the trade's shape, named on the site already)
Copper and pipe on the commodity tape
Fixture allowances and the back-charge trap
Underground changes (the first trade in the dirt of the building)
Service vs new construction (the family split, plumbing verse)
PLUMBING BENCHMARKS
Metric$1M to $5M$5M to $10M$10M to $25M
Gross margin, industry average25%26%27%
Gross margin, CFOS target26%26%27%
Net profit, industry average9%11%13%
Net profit, CFOS target11%12%14%
Overhead, industry average16%15%14%
Overhead, CFOS target15%14%13%

Industry figures are Plumbing contractors' AVERAGE for each revenue band, not a floor. The CFOS net profit target is set at 10 percent before taxes or 3.5 points better than your trade's average at your revenue, whichever is higher, and the gross margin target is set at whatever gross margin produces that net profit once your overhead is paid, and never below your trade's own average. Gross minus overhead equals net on every column, so the rows tie out.

Last 12 months revenueMonthly fee
Up to $1M$1,900 to $2,900
$1M to $3.5M$2,600 to $3,900
$3.5M to $6.5M$3,800 to $5,700
$6.5M to $9.5M$5,100 to $7,100
$9.5M to $12.5M$6,100 to $8,500
$12.5M to $15.5M$7,400 to $11,000
$15.5M to $18.5M$9,400 to $13,500
$18.5M+Quoted individually

Range reflects the three tiers below. Which one you're in depends on how much of the work you want off your desk. No payroll. No hidden line items.

Core

You stop guessing.

You get the CFO work. Job costing built against the way you estimate, a 13 week cash forecast, monthly WIP, and a meeting every month that ends in decisions rather than a report.

Your bookkeeper keeps doing the books.

Executive

You stop touching the books.

Everything in Core, and we run the bookkeeping and the controllership as well. Nobody in your office is answering coding questions or chasing a reconciliation at month end.

We do the books. No payroll.

Strategic

Every job shows its margin while it's still running.

Everything in Executive, plus the job costing and WIP platform set up, loaded with your cost codes, and managed for you every month. You never have to learn it.

We do the job costing.

What's included
COMMON QUESTIONS

FREQUENTLY ASKED.

Plumbing contractors at $1M to $5M net about 7.5 percent on the SPM 48-trade benchmark dataset, rising to 9.5 percent by $25M to $50M; the CFOS target at $1M to $5M is 11 percent. The flat middle of that curve usually traces to construction-heavy mix; service-mix operators lift it. Every net profit figure here is stated before taxes, the same basis CFMA reports on, so the two are directly comparable.
The canyon between plumbing's two spending humps: underground and rough-in consume labor and pipe early, the trade demobilizes while the building closes up, and trim-out returns months later to collect final payment behind punch and retainage. Phase-weighted schedules of values, with rough-in billed at rough-in weight and trim-out as a separate remobilization, are the fix.
Date-stamp the price basis in every bid, carry an escalation clause indexed to published copper or resin references, and buy out underground and rough packages early on long jobs. Copper moved 24.75 percent in the year to May 2026; a fixed bid without a clause is a commodity position.
Late selections compress the schedule, substitutions shift cost silently, and the reconciliation happens at closeout when leverage is gone. Put selection deadlines with schedule consequences in the contract, reconcile the allowance in writing as each selection lands, and price every substitution delta as a change order.
Whoever documented them. Rock, groundwater, and mislocated lines under the slab are changed conditions only if they're photographed, measured, and priced before backfill buries the evidence; after the pour, they're the plumber's donation.
Sulphur Prairie Management, operating as The Construction CFO, publishes the 48-trade benchmark dataset these numbers come from. SPM's deepest specialization is 24 core commercial trades, and SPM works with plumbing contractors who want the same financial system: onboarding, clean books, a maintained 13-week cash flow forecast, and monthly health reviews, with job costing simplified to what the business runs on. The full 48-trade benchmark reference exists so owners in every trade can measure against real numbers. ---
CFOS serves commercial plumbing subcontractors doing $1M to $12M. Pricing starts at $1,900 per month for companies under $1M and runs to $13,500 per month at the top published band. Onboarding takes 60 days.
Three tiers, and which one you are in depends on how much of the work you want off your desk. Core is where you stop guessing: job costing built against the way you estimate, a 13 week cash forecast, monthly WIP, and a monthly meeting that ends in decisions, while your bookkeeper keeps doing the books. Executive is where you stop touching the books, because we run the bookkeeping and the controllership as well. Strategic is where every job shows its margin while it is still running, because the job costing and WIP platform is set up and managed for you. No payroll. No scope gaps.
Sixty days. We migrate your books back to the start of your last taxable year, set up ControlQore, and build your job costing structure from scratch. Fully operational in two months.
$10.7M+
Client AR Recovered Since 2023
48
Active Trade Specializations
60 DAYS
Average Onboarding Time
WHAT THIS TIES INTO
Josh Luebker, The Construction CFO
Josh Luebker
FRACTIONAL CFO · THE CONSTRUCTION CFO

Former commercial construction project manager and master electrician. Managed 150+ projects worth more than $2.1B combined, with individual jobs from $50,000 to $300M, including data centers, military bases, hospitals, and high-rises. Now fractional CFO for commercial subcontractors doing $1M to $12M through Sulphur Prairie Management.About Josh  | LinkedIn

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