Progress Payments and Retainage

An excavation contractor can win a job on a good number and still run out of cash halfway through it. The work is fine, the crew is productive, the equipment is paid for — and the money is sitting in an owner's approval queue, a retainage account, or a change order that nobody has priced.

Billing is a construction skill, not paperwork. It has its own forms, its own arithmetic, and its own timing rules, and the contractors who get paid reliably are the ones who treat the monthly pay application as part of the job rather than something to catch up on at the end of the month.

Why Billing Discipline Beats a Good Bid

Earthwork is front-loaded with cost. Mobilization, clearing, and mass excavation happen early, and the material and fuel bills land before the first payment does. A contractor who bills slowly is effectively financing the owner's project out of the company's operating account, and the fastest way to lose a profitable job is to finish it while still waiting on the third pay application.

The fix is structural rather than heroic: a schedule of values that matches how the work actually progresses, a submittal routine that gets the application in on the same date every month, and a clean document trail behind every dollar. The estimating side of the job is covered in how to estimate an excavation job; this piece covers what happens after the award.

The Paper Trail: What a Pay Application Actually Contains

On commercial and institutional work, the standard vehicle is the AIA G702 Application and Certificate for Payment paired with the G703 Continuation Sheet. The G702 is a one-page summary of the contract status to date. The G703 is the detail behind it, breaking the contract sum into line items that follow the schedule of values the contractor submits at the start of the project.

The architecture is simple once you see it. The G703 lists each portion of the work with its scheduled value, then tracks completed work from previous applications, work completed this period, and materials presently stored. The G702 rolls those subtotals up, subtracts previous payments, applies retainage, and produces the amount due this period. Add a certification signature and the architect's or owner's representative's certificate, and the application is complete.

Many excavation contractors work on forms other than AIA, or on a simple invoice against a contract schedule. The logic is identical; only the paper changes. What does not change is that the owner's reviewer has to be able to trace the number on the summary line back to the work in the ground.

Building a Schedule of Values That Survives Review

The schedule of values is where most billing disputes are silently created. It is submitted early, usually gets a quick approval, and then governs payment for the rest of the project. Get it wrong and every application after it is an argument.

A workable schedule of values follows the way the job is actually built and the way the money is actually spent. For an earthwork package that usually means separate lines for mobilization, clearing and grubbing, erosion and sediment controls, unclassified excavation, rock excavation, fill and compaction, grading, utility trenching, backfill, aggregate base, and demobilization. Line items that combine several of those into one lump make it impossible to bill partial progress, which means the contractor eats the cost until the whole lump is complete.

Two rules keep the schedule honest. First, the lines should total to the contract sum exactly, with change orders added as separate line items rather than blended in. Second, no line should be so heavily front-loaded that the owner's reviewer flags it — a mobilization line that consumes 20 percent of a contract for a job that starts next week is going to get questioned, and rightly.

Where quantities drive the money, the takeoff discipline behind the schedule matters. The methods are in excavation takeoff methods, and the unit-price side is in excavation cost per cubic yard.

The G702 Math, Column by Column

The G703 columns are worth memorizing because the arithmetic is unforgiving:

• Columns A through C identify the work item and its scheduled value, which total to the original contract sum as adjusted by change orders.
• Column D carries forward the value of work completed under the previous application.
• Column E is the value of work completed this period, including materials that were previously billed as stored and have now been incorporated.
• Column F is materials presently stored but not yet installed.
• Column G is the sum of D, E, and F, and dividing it by the scheduled value in Column C gives the percent complete for that line.
• Column H is the remaining balance.
• Column I exists for contracts with variable retainage by line item and is often left blank on projects withholding a flat percentage from the whole contract.

The most common error is double-billing stored material. When material is billed as stored, it sits in Column F. It does not move to Column E until it is actually installed — and when it does, it comes out of Column F. Owners who pay for stored material without that discipline end up paying for the same pipe twice, and reviewers who catch it once tend to scrutinize everything after.

Both documents have to agree. If the G702 summary and the G703 detail differ by a dollar, the application goes back, and the payment clock restarts.

Stored Materials: Bill Them, Then Stop Billing Them

Stored materials are legitimate billable value, and on utility and aggregate-heavy work they can be a meaningful chunk of a monthly application. They are also where documentation requirements get strict, because the owner is paying for something it cannot see in place.

Expect to provide evidence of purchase, delivery tickets or vendor invoices, and confirmation that the material is stored on site or in a bonded warehouse and is insured and identifiable to the project. The FAR approach for federal work makes the standard explicit: material delivered to a location other than the site may be considered only where the contract authorizes it and the contractor shows satisfactory evidence of title and intended use. Commercial contracts vary, but the concept is the same.

Retainage: The Percentage You Finance for the Owner

Retainage is money withheld from each payment as protection against incomplete or defective work. It is not a penalty and it is not negotiable at the invoice stage — it is whatever the contract says, subject to any cap the state statute imposes.

What matters operationally is that retainage compounds across the life of the job. Withholding a percentage of every application means the withheld amount grows as the job progresses, and that money typically is not released until substantial completion at the earliest, with a further slice held through the warranty or punch list period. On a long earthwork package, that is a real financing cost, and it belongs in the bid — which is why excavation job costing has to track cash timing and not just cost per unit.

Two practical habits reduce the pain. Bill every month on the same date so retainage accumulates in predictable steps rather than in one lump at the end, and read the release provision before mobilization, not after the last load of dirt leaves. The contract language that governs all of this is covered in the excavation contracts guide.

What the Federal Rules Actually Say

Federal work has a written rulebook, and it is worth knowing even for contractors who rarely bid it, because agency and prime contracts often copy the language.

Under the prompt payment clause for construction contracts, progress payments are due 14 days after the designated billing office receives a proper payment request. Final payments are due on the later of 30 days after a proper invoice or 30 days after government acceptance. Improper invoices must be returned with reasons within seven days, and late payments carry an interest penalty calculated under the prompt payment regulations.

Retainage sits in a separate clause. Where the contracting officer finds satisfactory progress, the payment is authorized in full; where it does not, the maximum retention is 10 percent of the payment until satisfactory progress is achieved. At substantial completion the government releases the previously withheld funds down to an amount it considers adequate for protection, and separately priced divisions of the work are paid without retention on completion and acceptance.

The same clause family also runs downhill. Prime contractors must include prompt payment terms in subcontracts obligating payment to subcontractors within seven days of receiving the corresponding payment, with an interest penalty for late payment. If you are a sub on a federal job, that is a clause you can point to.

The Four Lien Waivers — and Which One You Sign

Lien waivers are the exchange mechanism at the center of every payment. You are trading a claim against the property for money, and the type of waiver you sign determines what you give up and when.

• Conditional progress waiver. Waives lien rights for a defined portion of work once payment is received. This is the standard waiver attached to a pay application and the right one to sign at submittal.
• Unconditional progress waiver. Waives those rights the moment it is signed, whether or not the check has cleared. Only appropriate after the money is actually in the account.
• Conditional final waiver. Waives lien rights for the whole project effective on receipt of the final payment. The standard closeout document.
• Unconditional final waiver. Waives everything immediately on signature. Appropriate only when the work is complete and paid in full, and only after any disputed amounts have been carved out in writing.

The recurring mistake is signing an unconditional waiver because it arrived with the payment package and the payment "is on the way." If the check is late, disputed, or short, the waiver is already effective. Conditional versions exist precisely so that does not happen.

Two more points save real money. The waiver should state the amount it covers and the through-date, so it releases only what has been paid. And on public projects, mechanic's liens are not available against the property at all — the equivalent protection runs against the prime's payment bond, so the document in front of you may be a bond claim waiver rather than a lien waiver. The bond side of that system is covered in surety bonds for excavation contractors.

Change Orders and Extra Work

Unbilled change work is the most common way a profitable job becomes a break-even job. The pricing and documentation discipline is covered in differing site conditions and change orders, but the billing rule is simple: a change order gets its own line item on the schedule of values, its own G703 entry, and its own place in the G702 change order summary. Do not absorb it into an existing line, because once it disappears into a lump sum it is very hard to recover.

For work performed before a change order is executed, the ticket is the evidence. Signed daily tickets noting equipment, hours, and material, with a photo and a name, are what make a disputed extra payable six months later.

Common Reasons a Pay Application Gets Cut

Reviewers cut applications for predictable reasons, and almost all of them are preventable:

• Percent complete on a line does not match what is visible in the field.
• Stored material is billed twice or is not documented.
• A change order is included but not executed, or executed but excluded.
• The lien waiver is the wrong type or covers the wrong period.
• Required closeout documentation — test results, compaction records, as-builts, certified payroll — is missing.
• The application arrived after the contractual cutoff and rolls to next month.
• The summary and the detail do not reconcile.

The compaction and test record piece is worth flagging, because excavation work generates a paper trail that owners increasingly require before releasing payment. Density tests, proof roll records, and inspection sign-offs are the evidence that the work behind the invoice exists. What that package should contain is covered in the jobsite handoff checklist.

A Monthly Billing Routine

1. Photograph and measure progress on the same day each month, line item by line item.
2. Reconcile quantities against field records and the latest survey or drone flight.
3. Update the G703 columns before touching the G702 summary.
4. Confirm stored materials, documentation, and that previously stored material has moved out of Column F once installed.
5. Add any executed change orders as separate lines; list pending ones separately and do not bill them.
6. Calculate retainage per the contract and verify it matches the previous period's rate.
7. Attach the correct conditional lien waiver for the amount and through-date being billed.
8. Attach test results, tickets, and any other documentation the contract requires.
9. Submit before the contractual cutoff and log the delivery date and time.
10. Track days to payment against the contract terms, and follow up in writing the day the clock runs out.

None of that requires new software. It requires the same thing the excavation itself requires: a plan, a schedule, and someone who owns the outcome.