SHORING AND SHIELDING · CIVIL AND EARTHWORK · FIXED BY STEP 07

Your work ends in March; your retention ends next spring

Shoring starts on day one of excavation, so your install is done in the first quarter. The retention rides until the whole project is accepted.

WHY IT IS A SHORING AND SHIELDING PROBLEM

Every trade dislikes retention; what's different here is the span. You're the first trade on and one of the earliest done, so your retention is held across the longest possible stretch of any sub on that job. The last piece of your scope waits on another contractor's backfill, which means your completion date belongs to their schedule.

WHAT IT COSTS

The size of it

Cash earned in month two sits until month eighteen, financed out of your line of credit while you're bidding the next three jobs.

NO PUBLISHED BENCHMARK FOR THIS TRADE

No published benchmark reference breaks this trade out on its own. CFMA reports at NAICS level, and at that level this trade rolls into a broader bucket with several others. That's why this page carries mechanisms and no margin figures. It reports inside NAICS 238910 Site Preparation, so there's no shoring and shielding margin figure to put in this box. The 48 trades that do publish average 7% net profit at $1M–$5M before taxes, which is the nearest reference point worth anything here.

Your first day on site is essentially day one of excavation, and the install portion is complete very early in a civil or structure schedule. Retention is withheld against final acceptance of the entire project, not against completion of your work. The removal portion can't close out until the permanent work is built and backfilled, so you can't reach substantial completion of your own scope on your own effort, no matter how well your crews run. Money earned in month two gets financed by you until month eighteen, sitting on top of pay-when-paid on the progress billings themselves.

WHAT TO DO

Three moves, in order

STEP 01

Build the cash plan by month on the calendar, not by percent complete. Mark the month your scope finishes and the month acceptance is forecast, and look at the distance between them.

STEP 02

Negotiate release of your retention at acceptance of your removal work, or a partial release at install completion. Even a partial changes the float materially.

STEP 03

Age retention as its own receivable by job with an expected-release month attached, and review that list monthly with the same seriousness as AR.

THE FIX

Step 07: Monthly cadence

Weekly bookkeeping, cost to complete, and one CEO report, on the same days every month.

CFOS-07 · CHAPTER 7

The monthly close that takes a contractor 5 hours

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

BENCHMARKS

Shoring and shielding by revenue band

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

ACROSS EVERY TRADE

Profitable on the P&L, out of cash

Your P&L says you made money and your bank account says you didn't. Both are telling the truth.

SAME TRADE

What else costs shoring and shielding contractors money

SHORING AND SHIELDING · CFOS-04

You pay for the stamp and wait on somebody else's data

The box can't go in the ground until a registered PE seals the design, and the engineer is waiting on borings the GC hasn't sent. Your crew and your iron are already on site.

SHORING AND SHIELDING · CFOS-02

Footage Stops Earning and the Box Rental Never Stops

Trench safety pays by the linear foot of centerline. Shields and slide rail cost by the calendar day, and the calendar doesn't care that the pipe crew is waiting on an inspector.

SHORING AND SHIELDING · CFOS-04

Cut-off Piles Turn Your Salvage Credit Into Zero

You locked sheet pile pricing at bid and bid the same steel a second time as salvage. Then an obstruction forces cut-off, and the residual you counted on stays in the dirt.

SHORING AND SHIELDING · CFOS-03

Rain Adds Qualified Hours Your Pay App Never Bills

OSHA wants a competent person walking the excavation before anybody enters, daily, and again after every rainstorm. That's qualified labor on a schedule set by weather.

SHORING AND SHIELDING · CFOS-08

You Leave Nothing Behind and Still Get a Claim Later

You leave no permanent installation behind, so there's no warranty item to carry. Settlement, voids after extraction, and a rental damage invoice come after the job is closed.

SAME MECHANISM, OTHER TRADES

The same mechanism in other trades

CIVIL

Your retainage is waiting on 70 percent grass

You finished grading in month three and utilities in month six, and the last 5 to 10 percent of your contract sits behind a seed bed that has to hit 70 percent cover.

CONCRETE

Done in June, Retention Releases When the Building Opens

Footings, foundations, and slab-on-grade are the first real dollar volume on the site, so you bill most of your contract early and then wait on a building you left a year and a half ago.

DEMOLITION

Demo Goes First And Gets Its Retention Back Last

You work five weeks and wait twenty months for the money. Your retention rides the prime's substantial completion on a building you left before the foundation went in.

QUESTIONS

What shoring and shielding owners ask

Shoring scope finished early but retainage held until the end of the project?

Shoring starts on day one of excavation, so your install is done in the first quarter. The retention rides until the whole project is accepted.

What does it cost?

Cash earned in month two sits until month eighteen, financed out of your line of credit while you're bidding the next three jobs.

What do I do first?

Build the cash plan by month on the calendar, not by percent complete. Mark the month your scope finishes and the month acceptance is forecast, and look at the distance between them.

Are there published benchmarks for shoring and shielding?

No, and this site won't print one. No published benchmark reference breaks this trade out on its own. CFMA reports at NAICS level, and at that level this trade rolls into a broader bucket with several others. That's why this page carries mechanisms and no margin figures. In the surveys it rolls into NAICS 238910 Site Preparation, so the closest honest reference is the 48-trade table, where net profit at $1M–$5M averages 7% before taxes. Read that as the neighbourhood, and read your own job costing as the answer.

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.

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.