How to Review a Construction Pay App: A Complete Checklist

Pay applications are how contractors get paid on construction projects. But they're also where billing errors—intentional or not—slip through. Studies show 3-7% of construction invoices contain errors that favor the contractor.

If you're a project manager, owner's rep, or finance professional reviewing pay apps, this checklist will help you catch issues before you approve payment.

What is a Pay Application?

A pay application (or "pay app") is a formal request from a contractor for payment based on work completed during a billing period. It typically includes:

• Schedule of Values (SOV) showing all line items
• Percentage complete for each line item
• Materials stored on-site or off-site
• Change orders and their status
• Retainage calculations
• Supporting documentation

On most commercial and institutional projects, pay apps follow the AIA G702/G703 format—the industry standard for application and certificate for payment.

The Pay App Review Checklist

1. Verify the Math

Before anything else, check the arithmetic:

• Do line item totals match the SOV?
• Is the percentage complete calculated correctly?
• Does retainage math check out?
• Do change orders tie to approved amounts?

Sounds basic, but calculation errors are surprisingly common—especially on complex pay apps with hundreds of line items.

2. Compare to Previous Pay Apps

Pull the last 2-3 pay apps and look for:

• Sudden jumps in completion: Did a line item go from 40% to 90% in one month?
• Stalled items: Has something been "95% complete" for three months?
• Retainage inconsistencies: Is retainage being applied consistently?

Trend analysis catches patterns that single-month reviews miss.

3. Validate Against Site Observations

The pay app should reflect reality on the ground:

• Does claimed progress match what you see on site?
• Are stored materials actually on-site (or properly documented if off-site)?
• Have substantial completion milestones actually been reached?

If you can't verify progress personally, request photos, daily reports, or third-party inspection reports.

4. Check Change Order Status

Change orders are where billing disputes often originate:

• Are only approved change orders included?
• Are pending change orders clearly marked?
• Do change order amounts match the approved values?
• Is markup calculated per contract terms?

Never pay for unapproved change orders. If a contractor includes them, send the pay app back for revision.

5. Review Stored Materials

Materials stored on-site or off-site can represent significant billing:

• Is there documentation for off-site storage?
• Are stored materials protected and insured?
• Will stored materials actually be used on this project?
• Are quantities reasonable for upcoming work?

Some contractors bill for materials they'll use across multiple projects. Verify that stored materials are project-specific.

6. Verify Subcontractor Payments

On GMP or cost-plus contracts:

• Are subcontractor invoices attached?
• Do sub amounts tie to the pay app?
• Is the GC markup calculated correctly?
• Are lien waivers current?

Request conditional lien waivers from major subs before releasing payment.

7. Check Contract Compliance

Pull out your contract and verify:

• Billing frequency matches contract terms
• Retainage percentage is correct
• Early payment discounts (if any) are applied
• Insurance certificates are current

Contract non-compliance is grounds for rejecting a pay app.

Common Pay App Red Flags

Watch for these warning signs:

| Red Flag | What It Might Mean | |----------|-------------------| | Front-loaded billing | Contractor billing ahead of actual progress | | Round numbers everywhere | Estimates rather than actual counts | | Vague line item descriptions | Hiding scope or overbilling | | Missing backup documentation | Can't verify claimed work | | Frequent "true-ups" | Original estimates were wrong | | Retainage release requests before completion | Cash flow problems |

How AI Can Help

Manual pay app review is time-consuming. On complex projects with hundreds of line items, thorough review can take hours per pay app.

AI-powered tools can:

• Extract and verify all calculations automatically
• Flag anomalies and unusual patterns
• Compare against historical data and benchmarks
• Generate questions to ask the contractor

Try our free Pay App Analyzer to see how AI can streamline your review process.

What to Do When You Find Issues

When you identify problems:

1. Document everything: Note the specific issue and supporting evidence
2. Request clarification: Give the contractor a chance to explain
3. Reject or modify: Don't approve pay apps with unresolved issues
4. Track patterns: Repeated issues may indicate systemic problems

Remember: it's easier to address billing issues before payment than to claw back money after.

Industry-Specific Considerations

Pay app review varies by project type:

• Data center projects: Watch for MEP overbilling and equipment cost allocation
• Infrastructure projects: Verify unit price calculations and prevailing wage compliance
• Life sciences facilities: Check validation and commissioning billing carefully
• Energy projects: Confirm equipment costs match procurement agreements

The Bottom Line

Effective pay app review protects your project budget and maintains healthy contractor relationships. A systematic approach—supported by the right tools—catches errors before they become disputes.

Want to streamline your pay app review process? Try our free Invoice Analyzer or join the folio pilot for enterprise-grade invoice verification.