Construction Change Orders: The Payment Workflow Behind a Signed CO
- What is a construction change order, and how is it different from a change directive or claim?
- How does an approved change order move through the schedule of values and the pay application?
- Who pays whom for change-order work, and which payment instruments fit?
- How do you track and log change orders so they don't become claims?
- Pay for change-order work with Corpay
A construction change order is a written agreement that modifies the original contract's scope, price, or schedule. Signing it is step one of many. The payment chain that follows, from updating the schedule of values to billing the pay application, recalculating retainage, paying the subs, and releasing lien waivers, is where most projects actually lose margin and time. The dollars are significant, with change orders typically running 10% to 15% of total contract value on major projects, according to Rhumbix. This guide takes a payment-workflow lens on the change-order chain, building on our construction payment management pillar, and includes a payment-instrument table for the changed scope.
Key Takeaways
A change order modifies contract scope, price, or time, but the work only pays out cleanly if the schedule of values, pay app, and retainage all absorb it correctly.
Work done on an approved-but-unsigned change order creates underbilling, a working-capital drain that lenders and sureties scrutinize.
A change order is distinct from a construction change directive, which proceeds before price is agreed, and from a claim, which is an unresolved dispute.
The right payment instrument depends on the counterparty: ACH or virtual card for subs, commercial cards for material surges, joint checks where supplier risk demands it.
Every payment for change-order work should tag to the new SOV line and cost code, so the project ledger and WIP report stay accurate.
What is a construction change order, and how is it different from a change directive or claim?
A construction change order, often executed on an AIA G701 form, is a mutually signed agreement to change the contract's scope, price, or time. It differs from related instruments by whether the parties have agreed and whether work has started. Getting the distinction right matters because each one bills and pays differently.
Instrument | Agreement status | Payment treatment |
Change order | Owner and contractor agree on scope, price, and time | Billed on the pay app once executed |
Construction change directive | Owner directs the work before price and time are settled | Work proceeds; price resolved and billed later |
Claim | Entitlement or amount is disputed | Resolved through negotiation or legal process |
What triggers a change order on a typical project?
Change orders come from a handful of recurring sources, and recognizing them early keeps them from turning into disputes:
Owner-initiated scope changes and upgrades.
Design errors and omissions in the documents.
Unforeseen field or site conditions.
Regulatory or code changes mid-project.
Value engineering that alters means or materials.
Design changes are a major driver of cost growth, accounting for a large share of the 85% of projects that experience cost overruns, where the average overrun runs 28%, according to McKinsey.
How does an approved change order move through the schedule of values and the pay application?
An approved change order does not just sit in a contract file; it ripples through the whole payment chain.
A new line is added to the schedule of values, with its own scheduled value.
That line flows into the next pay application.
Retainage is withheld on the new line at the contract percentage.
The sub or supplier is paid, and the lien waiver is released.
The trouble starts when the work happens before the paperwork catches up.
How do you bill a change order when it is approved but not signed?
You generally cannot bill it cleanly until it is executed, which is exactly the problem. Work performed on an approved-but-unsigned change order creates underbilling, an immediate working-capital drain, and unapproved change-order work may be removed from the contract price by lenders and sureties, reducing equity and prequalification capacity, according to the Construction Financial Management Association. The practical defense is to push for signature before the work proceeds, and to document everything when it cannot wait. This is slow money even when it goes right, with construction days in accounts receivable at 56.6 days in 2023, per the Construction Financial Management Association.
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How does retainage apply to change-order work?
Retainage applies to change-order work at the same percentage as the base contract by default, unless the contract language carves out an exception. The new SOV line carries its own retainage, withheld and released on the same terms as the rest of the project. Handling construction retainage consistently across base and changed scope keeps the closeout math clean and prevents the double-holding that strains subcontractors.
Who pays whom for change-order work, and which payment instruments fit?
Change-order work introduces new payees and new spend, and the right instrument depends on who you are paying and why. Matching the rail to the counterparty extends working capital and keeps the payment tagged to the new SOV line.
Counterparty or scope | Best-fit instrument | Why |
Subcontractors on the new scope | ACH or virtual card | Cheap, traceable, tagged to the new SOV line |
Material surge purchases | Commercial card | Extends working capital without drawing the credit line |
One-off new vendors | Virtual card | Single-use control for a vendor you may not use again |
An at-risk sub's supplier | Joint check | Ensures the supplier is paid and heads off a lien |
When does a joint check make sense on change-order work?
A joint check makes sense when a change order brings in a sub whose own supplier is at risk of not being paid. Naming both the sub and its supplier on one check guarantees the supplier sees the money, which heads off a lien on the changed scope. It is a deliberate exception for a high-risk payment, not a default, and it pairs with the lien waiver that actually releases the rights.
How do commercial and virtual cards handle change-order material surges?
Commercial and virtual cards handle material surges by extending float on the new spend without drawing down the line of credit you need for payroll and base-contract costs. A change order often triggers a burst of material buying, and putting that on cards built for construction field spend keeps the surge from straining cash while tagging each purchase to the right job. A virtual card adds single-use control for a vendor the changed scope introduced.
How do you track and log change orders so they don't become claims?
You keep change orders from becoming claims by logging and documenting each one consistently, so nothing falls into the gap between approval and payment. A change-order log should capture the fields that drive both billing and risk:
CO number and the date it was initiated.
Owner approval status and signature date.
Contract sum and contract time impact.
The affected SOV line.
Payment status and lien waiver status.
That log integrates with the construction ERP, whether Sage 100 Contractor, Foundation, or Viewpoint Vista, so the documented change order, the SOV update, and the payment stay aligned. Discipline here is cheaper than the alternative, since each request for information averages about $1,080 to review, according to the Navigant Construction Forum, and unmanaged RFIs are what spiral into change orders and then claims. The labor market adds pressure, with 92% of contractors reporting difficulty filling open positions, per Associated General Contractors of America, leaving no slack for rework caused by sloppy documentation. Keeping the AP side disciplined, as our AP automation best practices lay out, is part of the same defense.
Pay for change-order work with Corpay
Corpay is the payment layer between your construction ERP and the bank, paying subs and suppliers for the changed scope without breaking project-tagged accounting. Project-tagged ACH and virtual cards pay subs on the new SOV line, commercial cards cover material surges and one-off vendors, and joint-check workflows handle the cases where supplier risk demands them, all aligned to the change-order chain. Because every payment carries the new SOV line, cost code, and project, the GL stays in step with the change order and the WIP report reflects reality.
The result is change-order work that pays out without disrupting the rest of the project ledger. Explore Corpay AP automation for the subcontractor and supplier side, Corpay commercial cards for material surges, or Corpay Complete for the unified payment platform. For the upstream documents, our guides to purchase order vs. invoice and choosing construction payment software round out the workflow.
Frequently Asked Questions
What is a construction change order?
A construction change order is a written, mutually signed agreement that modifies the original contract's scope, price, or schedule, often executed on an AIA G701 form. Once executed, it becomes a new line on the schedule of values and is billed through the pay application like any other line of work.
What is the difference between a change order and a construction change directive?
A change order is signed only after the owner and contractor agree on scope, price, and time. A construction change directive lets the owner direct the work to proceed before price and time are settled, with the amount resolved and billed later. The directive keeps work moving when agreement is not yet possible.
How do change orders affect a pay application?
An executed change order adds a new line to the schedule of values with its own scheduled value, which then flows into the next pay application. Retainage applies to it on the same terms as the base contract. Work done before the change order is signed cannot be billed cleanly, which creates underbilling.
How do retainage and lien waivers apply to change-order work?
Retainage applies to the new change-order SOV line at the base-contract percentage unless the contract carves out an exception. Lien waivers follow the payment for the changed scope just as they do for base-contract work, so each payment should be paired with the appropriate conditional or unconditional waiver.
When should a contractor use a joint check on change-order materials?
A contractor should use a joint check when a change order brings in a sub whose supplier is at risk of not being paid. Naming both the sub and its supplier on the check ensures the supplier receives the money and avoids a lien on the changed scope. It is a deliberate exception for a high-risk payment.
What payment instrument should you use for change-order work?
Match the instrument to the counterparty. Use ACH or a virtual card for subcontractors on the new scope, a commercial card for material surges that would otherwise strain cash, a virtual card for one-off vendors, and a joint check where a supplier's payment risk justifies it. Each payment should tag to the new SOV line.
- What is a construction change order, and how is it different from a change directive or claim?
- How does an approved change order move through the schedule of values and the pay application?
- Who pays whom for change-order work, and which payment instruments fit?
- How do you track and log change orders so they don't become claims?
- Pay for change-order work with Corpay
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